MAPREDUCE-3205. Fix memory specifications to be physical rather than virtual, allowing for a ratio between the two to be configurable. Contributed by Todd Lipcon.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1189542 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Arun Murthy
parent
753c14cf4e
commit
237154982b
@ -432,6 +432,10 @@ Release 0.23.0 - Unreleased
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MAPREDUCE-2747. Cleaned up LinuxContainerExecutor binary sources and changed
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the configuration to use yarn names. (Robert Joseph Evans via vinodkv)
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MAPREDUCE-3205. Fix memory specifications to be physical rather than
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virtual, allowing for a ratio between the two to be configurable. (todd
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via acmurthy)
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OPTIMIZATIONS
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MAPREDUCE-2026. Make JobTracker.getJobCounters() and
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@ -296,8 +296,12 @@ public class YarnConfiguration extends Configuration {
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public static final String DEFAULT_NM_REMOTE_APP_LOG_DIR = "/tmp/logs";
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/** Amount of memory in GB that can be allocated for containers.*/
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public static final String NM_VMEM_GB = NM_PREFIX + "resource.memory-gb";
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public static final int DEFAULT_NM_VMEM_GB = 8;
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public static final String NM_PMEM_MB = NM_PREFIX + "resource.memory-mb";
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public static final int DEFAULT_NM_PMEM_MB = 8 * 1024;
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public static final String NM_VMEM_PMEM_RATIO =
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NM_PREFIX + "vmem-pmem-ratio";
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public static final float DEFAULT_NM_VMEM_PMEM_RATIO = 2.1f;
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/** NM Webapp address.**/
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public static final String NM_WEBAPP_ADDRESS = NM_PREFIX + "webapp.address";
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@ -314,10 +318,6 @@ public class YarnConfiguration extends Configuration {
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public static final String NM_CONTAINER_MON_RESOURCE_CALCULATOR =
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NM_PREFIX + "container-monitor.resource-calculator.class";
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/** Amount of physical ram to reserve for other applications, -1 disables.*/
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public static final String NM_RESERVED_MEMORY_MB =
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NM_PREFIX + "reserved.memory-mb";
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/** Frequency of running node health script.*/
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public static final String NM_HEALTH_CHECK_INTERVAL_MS =
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NM_PREFIX + "health-checker.interval-ms";
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@ -286,9 +286,20 @@
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</property>
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<property>
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<description>Amount of memory in GB that can be allocated for containers.</description>
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<name>yarn.nodemanager.resource.memory-gb</name>
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<value>8</value>
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<description>Amount of physical memory, in MB, that can be allocated
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for containers.</description>
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<name>yarn.nodemanager.resource.memory-mb</name>
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<value>8192</value>
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</property>
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<property>
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<description>Ratio between virtual memory to physical memory when
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setting memory limits for containers. Container allocations are
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expressed in terms of physical memory, and virtual memory usage
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is allowed to exceed this allocation by this ratio.
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</description>
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<name>yarn.nodemanager.vmem-pmem-ratio</name>
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<value>2.1</value>
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</property>
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<property>
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@ -308,12 +319,6 @@
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<name>yarn.nodemanager.container-monitor.resource-calculator.class</name>
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</property>
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<property>
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<description>Amount of physical ram to reserve for other applications, -1 disables.</description>
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<name>yarn.nodemanager.reserved.memory-mb</name>
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<value>-1</value>
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</property>
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<property>
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<description>Frequency of running node health script.</description>
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<name>yarn.nodemanager.health-checker.interval-ms</name>
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@ -100,9 +100,9 @@ public synchronized void init(Configuration conf) {
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this.heartBeatInterval =
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conf.getLong(YarnConfiguration.NM_TO_RM_HEARTBEAT_INTERVAL_MS,
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YarnConfiguration.DEFAULT_NM_TO_RM_HEARTBEAT_INTERVAL_MS);
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int memory = conf.getInt(YarnConfiguration.NM_VMEM_GB, YarnConfiguration.DEFAULT_NM_VMEM_GB);
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int memoryMb = conf.getInt(YarnConfiguration.NM_PMEM_MB, YarnConfiguration.DEFAULT_NM_PMEM_MB);
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this.totalResource = recordFactory.newRecordInstance(Resource.class);
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this.totalResource.setMemory(memory * 1024);
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this.totalResource.setMemory(memoryMb);
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metrics.addResource(totalResource);
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super.init(conf);
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}
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@ -275,7 +275,7 @@ public StartContainerResponse startContainer(StartContainerRequest request)
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// //////////// End of parsing credentials
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Container container =
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new ContainerImpl(this.dispatcher, launchContext, credentials, metrics);
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new ContainerImpl(getConfig(), this.dispatcher, launchContext, credentials, metrics);
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ContainerId containerID = launchContext.getContainerId();
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ApplicationId applicationID =
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containerID.getApplicationAttemptId().getApplicationId();
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@ -32,6 +32,7 @@
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.security.Credentials;
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import org.apache.hadoop.util.StringUtils;
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@ -77,6 +78,9 @@ public class ContainerImpl implements Container {
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private int exitCode = YarnConfiguration.INVALID_CONTAINER_EXIT_STATUS;
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private final StringBuilder diagnostics;
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/** The NM-wide configuration - not specific to this container */
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private final Configuration daemonConf;
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private static final Log LOG = LogFactory.getLog(Container.class);
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private final RecordFactory recordFactory = RecordFactoryProvider.getRecordFactory(null);
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private final Map<LocalResourceRequest,String> pendingResources =
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@ -90,9 +94,11 @@ public class ContainerImpl implements Container {
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private final List<LocalResourceRequest> appRsrcs =
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new ArrayList<LocalResourceRequest>();
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public ContainerImpl(Dispatcher dispatcher,
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public ContainerImpl(Configuration conf,
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Dispatcher dispatcher,
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ContainerLaunchContext launchContext, Credentials creds,
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NodeManagerMetrics metrics) {
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this.daemonConf = conf;
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this.dispatcher = dispatcher;
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this.launchContext = launchContext;
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this.diagnostics = new StringBuilder();
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@ -568,12 +574,16 @@ static class LaunchTransition extends ContainerTransition {
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public void transition(ContainerImpl container, ContainerEvent event) {
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// Inform the ContainersMonitor to start monitoring the container's
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// resource usage.
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// TODO: Fix pmem limits below
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long vmemBytes =
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long pmemBytes =
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container.getLaunchContext().getResource().getMemory() * 1024 * 1024L;
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float pmemRatio = container.daemonConf.getFloat(
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YarnConfiguration.NM_VMEM_PMEM_RATIO,
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YarnConfiguration.DEFAULT_NM_VMEM_PMEM_RATIO);
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long vmemBytes = (long) (pmemRatio * pmemBytes);
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container.dispatcher.getEventHandler().handle(
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new ContainerStartMonitoringEvent(container.getContainerID(),
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vmemBytes, -1));
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vmemBytes, pmemBytes));
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container.metrics.runningContainer();
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}
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}
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@ -28,6 +28,7 @@
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.util.StringUtils;
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import org.apache.hadoop.yarn.api.records.ContainerId;
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import org.apache.hadoop.yarn.conf.YarnConfiguration;
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import org.apache.hadoop.yarn.event.AsyncDispatcher;
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@ -39,6 +40,8 @@
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import org.apache.hadoop.yarn.util.ProcfsBasedProcessTree;
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import org.apache.hadoop.yarn.util.ResourceCalculatorPlugin;
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import com.google.inject.internal.Preconditions;
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public class ContainersMonitorImpl extends AbstractService implements
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ContainersMonitor {
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@ -67,11 +70,6 @@ public class ContainersMonitorImpl extends AbstractService implements
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*/
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public static final long DISABLED_MEMORY_LIMIT = -1L;
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private static final String MEMORY_USAGE_STRING =
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"Memory usage of ProcessTree %s for container-id %s : Virtual %d bytes, "
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+
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"limit : %d bytes; Physical %d bytes, limit %d bytes";
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public ContainersMonitorImpl(ContainerExecutor exec,
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AsyncDispatcher dispatcher, Context context) {
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super("containers-monitor");
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@ -110,33 +108,33 @@ public synchronized void init(Configuration conf) {
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}
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}
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// ///////// Virtual memory configuration //////
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this.maxVmemAllottedForContainers =
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conf.getLong(YarnConfiguration.NM_VMEM_GB, YarnConfiguration.DEFAULT_NM_VMEM_GB);
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this.maxVmemAllottedForContainers =
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this.maxVmemAllottedForContainers * 1024 * 1024 * 1024L; //Normalize
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if (this.maxVmemAllottedForContainers > totalPhysicalMemoryOnNM) {
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LOG.info("totalMemoryAllottedForContainers > totalPhysicalMemoryOnNM."
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+ " Thrashing might happen.");
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}
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// ///////// Physical memory configuration //////
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long reservedPmemOnNM =
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conf.getLong(YarnConfiguration.NM_RESERVED_MEMORY_MB, DISABLED_MEMORY_LIMIT);
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reservedPmemOnNM =
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reservedPmemOnNM == DISABLED_MEMORY_LIMIT
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? DISABLED_MEMORY_LIMIT
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: reservedPmemOnNM * 1024 * 1024; // normalize to bytes
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this.maxPmemAllottedForContainers =
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conf.getLong(YarnConfiguration.NM_PMEM_MB, YarnConfiguration.DEFAULT_NM_PMEM_MB);
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this.maxPmemAllottedForContainers =
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this.maxPmemAllottedForContainers * 1024 * 1024L; //Normalize to bytes
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if (reservedPmemOnNM == DISABLED_MEMORY_LIMIT
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|| totalPhysicalMemoryOnNM == DISABLED_MEMORY_LIMIT) {
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this.maxPmemAllottedForContainers = DISABLED_MEMORY_LIMIT;
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} else {
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this.maxPmemAllottedForContainers =
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totalPhysicalMemoryOnNM - reservedPmemOnNM;
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if (totalPhysicalMemoryOnNM != DISABLED_MEMORY_LIMIT &&
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this.maxPmemAllottedForContainers >
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totalPhysicalMemoryOnNM * 0.80f) {
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LOG.warn("NodeManager configured with " +
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StringUtils.humanReadableInt(maxPmemAllottedForContainers) +
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" physical memory allocated to containers, which is more than " +
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"80% of the total physical memory available (" +
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StringUtils.humanReadableInt(totalPhysicalMemoryOnNM) +
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"). Thrashing might happen.");
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}
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// ///////// Virtual memory configuration //////
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float vmemRatio = conf.getFloat(
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YarnConfiguration.NM_VMEM_PMEM_RATIO,
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YarnConfiguration.DEFAULT_NM_VMEM_PMEM_RATIO);
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Preconditions.checkArgument(vmemRatio > 0.99f,
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YarnConfiguration.NM_VMEM_PMEM_RATIO +
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" should be at least 1.0");
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this.maxVmemAllottedForContainers =
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(long)(vmemRatio * maxPmemAllottedForContainers);
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super.init(conf);
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}
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@ -399,9 +397,10 @@ public void run() {
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long curRssMemUsageOfAgedProcesses = pTree.getCumulativeRssmem(1);
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long vmemLimit = ptInfo.getVmemLimit();
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long pmemLimit = ptInfo.getPmemLimit();
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LOG.info(String.format(MEMORY_USAGE_STRING, pId,
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containerId.toString(), currentVmemUsage, vmemLimit,
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currentPmemUsage, pmemLimit));
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LOG.info(String.format(
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"Memory usage of ProcessTree %s for container-id %s: ",
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pId, containerId.toString()) +
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formatUsageString(currentVmemUsage, vmemLimit, currentPmemUsage, pmemLimit));
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boolean isMemoryOverLimit = false;
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String msg = "";
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@ -411,18 +410,10 @@ && isProcessTreeOverLimit(containerId.toString(),
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// Container (the root process) is still alive and overflowing
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// memory.
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// Dump the process-tree and then clean it up.
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msg =
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"Container [pid="
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+ pId
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+ ",containerID="
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+ containerId
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+ "] is running beyond memory-limits. Current usage : "
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+ currentVmemUsage
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+ "bytes. Limit : "
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+ vmemLimit
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+ "bytes. Killing container. "
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+ "\nDump of the process-tree for " + containerId
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+ " : \n" + pTree.getProcessTreeDump();
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msg = formatErrorMessage("virtual",
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currentVmemUsage, vmemLimit,
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currentPmemUsage, pmemLimit,
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pId, containerId, pTree);
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isMemoryOverLimit = true;
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} else if (isPhysicalMemoryCheckEnabled()
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&& isProcessTreeOverLimit(containerId.toString(),
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@ -431,18 +422,10 @@ && isProcessTreeOverLimit(containerId.toString(),
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// Container (the root process) is still alive and overflowing
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// memory.
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// Dump the process-tree and then clean it up.
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msg =
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"Container [pid="
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+ pId
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+ ",tipID="
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+ containerId
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+ "] is running beyond physical memory-limits."
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+ " Current usage : "
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+ currentPmemUsage
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+ "bytes. Limit : "
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+ pmemLimit
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+ "bytes. Killing container. \nDump of the process-tree for "
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+ containerId + " : \n" + pTree.getProcessTreeDump();
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msg = formatErrorMessage("physical",
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currentVmemUsage, vmemLimit,
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currentPmemUsage, pmemLimit,
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pId, containerId, pTree);
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isMemoryOverLimit = true;
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}
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@ -484,6 +467,31 @@ && isProcessTreeOverLimit(containerId.toString(),
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}
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}
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}
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private String formatErrorMessage(String memTypeExceeded,
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long currentVmemUsage, long vmemLimit,
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long currentPmemUsage, long pmemLimit,
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String pId, ContainerId containerId, ProcfsBasedProcessTree pTree) {
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return
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String.format("Container [pid=%s,containerID=%s] is running beyond %s memory limits. ",
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pId, containerId, memTypeExceeded) +
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"Current usage: " +
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formatUsageString(currentVmemUsage, vmemLimit,
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currentPmemUsage, pmemLimit) +
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". Killing container.\n" +
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"Dump of the process-tree for " + containerId + " :\n" +
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pTree.getProcessTreeDump();
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}
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private String formatUsageString(long currentVmemUsage, long vmemLimit,
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long currentPmemUsage, long pmemLimit) {
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return String.format("%sb of %sb physical memory used; " +
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"%sb of %sb virtual memory used",
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StringUtils.humanReadableInt(currentPmemUsage),
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StringUtils.humanReadableInt(pmemLimit),
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StringUtils.humanReadableInt(currentVmemUsage),
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StringUtils.humanReadableInt(vmemLimit));
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}
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}
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@Override
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@ -30,6 +30,7 @@
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.NodeHealthCheckerService;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileContext;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
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@ -83,6 +84,7 @@ public class TestNodeStatusUpdater {
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int heartBeatID = 0;
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volatile Error nmStartError = null;
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private final List<NodeId> registeredNodes = new ArrayList<NodeId>();
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private final Configuration conf = new YarnConfiguration();
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@After
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public void tearDown() {
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@ -168,7 +170,7 @@ public NodeHeartbeatResponse nodeHeartbeat(NodeHeartbeatRequest request)
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launchContext.setContainerId(firstContainerID);
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launchContext.setResource(recordFactory.newRecordInstance(Resource.class));
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launchContext.getResource().setMemory(2);
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Container container = new ContainerImpl(null, launchContext, null, null);
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Container container = new ContainerImpl(conf , null, launchContext, null, null);
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this.context.getContainers().put(firstContainerID, container);
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} else if (heartBeatID == 2) {
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// Checks on the RM end
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@ -192,7 +194,7 @@ public NodeHeartbeatResponse nodeHeartbeat(NodeHeartbeatRequest request)
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launchContext.setContainerId(secondContainerID);
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launchContext.setResource(recordFactory.newRecordInstance(Resource.class));
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launchContext.getResource().setMemory(3);
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Container container = new ContainerImpl(null, launchContext, null, null);
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Container container = new ContainerImpl(conf, null, launchContext, null, null);
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this.context.getContainers().put(secondContainerID, container);
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} else if (heartBeatID == 3) {
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// Checks on the RM end
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@ -358,7 +360,7 @@ public void start() {
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private YarnConfiguration createNMConfig() {
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YarnConfiguration conf = new YarnConfiguration();
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conf.setInt(YarnConfiguration.NM_VMEM_GB, 5); // 5GB
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conf.setInt(YarnConfiguration.NM_PMEM_MB, 5*1024); // 5GB
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conf.set(YarnConfiguration.NM_ADDRESS, "127.0.0.1:12345");
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conf.set(YarnConfiguration.NM_LOCALIZER_ADDRESS, "127.0.0.1:12346");
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conf.set(YarnConfiguration.NM_LOG_DIRS, new Path(basedir, "logs").toUri()
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@ -37,6 +37,7 @@
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import java.util.Map.Entry;
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import java.util.Random;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.yarn.api.records.ContainerId;
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import org.apache.hadoop.yarn.api.records.ContainerLaunchContext;
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@ -45,6 +46,7 @@
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import org.apache.hadoop.yarn.api.records.LocalResourceVisibility;
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import org.apache.hadoop.yarn.api.records.Resource;
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import org.apache.hadoop.yarn.api.records.URL;
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import org.apache.hadoop.yarn.conf.YarnConfiguration;
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import org.apache.hadoop.yarn.event.Dispatcher;
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import org.apache.hadoop.yarn.event.DrainDispatcher;
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import org.apache.hadoop.yarn.event.EventHandler;
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@ -68,6 +70,7 @@
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public class TestContainer {
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final NodeManagerMetrics metrics = NodeManagerMetrics.create();
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final Configuration conf = new YarnConfiguration();
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/**
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@ -384,7 +387,7 @@ private static Map<String,ByteBuffer> createServiceData(Random r) {
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}
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private Container newContainer(Dispatcher disp, ContainerLaunchContext ctx) {
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return new ContainerImpl(disp, ctx, null, metrics);
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return new ContainerImpl(conf, disp, ctx, null, metrics);
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}
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@SuppressWarnings("unchecked")
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@ -266,12 +266,13 @@ public void testContainerKillOnMemoryOverflow() throws IOException,
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containerStatus.getExitStatus());
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String expectedMsgPattern =
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"Container \\[pid=" + pid + ",containerID=" + cId
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+ "\\] is running beyond memory-limits. Current usage : "
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+ "[0-9]*bytes. Limit : [0-9]*"
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+ "bytes. Killing container. \nDump of the process-tree for "
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+ cId + " : \n";
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+ "\\] is running beyond virtual memory limits. Current usage: "
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+ "[0-9.]+m?b of [0-9.]+m?b physical memory used; "
|
||||
+ "[0-9.]+m?b of [0-9.]+m?b virtual memory used. "
|
||||
+ "Killing container.\nDump of the process-tree for "
|
||||
+ cId + " :\n";
|
||||
Pattern pat = Pattern.compile(expectedMsgPattern);
|
||||
Assert.assertEquals("Expected message patterns is: " + expectedMsgPattern
|
||||
Assert.assertEquals("Expected message pattern is: " + expectedMsgPattern
|
||||
+ "\n\nObserved message is: " + containerStatus.getDiagnostics(),
|
||||
true, pat.matcher(containerStatus.getDiagnostics()).find());
|
||||
|
||||
|
||||
@ -107,7 +107,7 @@ public long getPmemAllocatedForContainers() {
|
||||
launchContext.setContainerId(containerId);
|
||||
launchContext.setUser(user);
|
||||
Container container =
|
||||
new ContainerImpl(dispatcher, launchContext, null, metrics) {
|
||||
new ContainerImpl(conf, dispatcher, launchContext, null, metrics) {
|
||||
@Override
|
||||
public ContainerState getContainerState() {
|
||||
return ContainerState.RUNNING;
|
||||
|
||||
@ -168,7 +168,7 @@ public synchronized void start() {
|
||||
getConfig().set(YarnConfiguration.NM_LOG_DIRS, logDir.getAbsolutePath());
|
||||
getConfig().set(YarnConfiguration.NM_REMOTE_APP_LOG_DIR,
|
||||
remoteLogDir.getAbsolutePath());
|
||||
getConfig().setInt(YarnConfiguration.NM_VMEM_GB, 4); // By default AM + 2 containers
|
||||
getConfig().setInt(YarnConfiguration.NM_PMEM_MB, 4*1024); // By default AM + 2 containers
|
||||
nodeManager = new NodeManager() {
|
||||
|
||||
@Override
|
||||
|
||||
@ -241,9 +241,17 @@ Hadoop MapReduce Next Generation - Cluster Setup
|
||||
*-------------------------+-------------------------+------------------------+
|
||||
|| Parameter || Value || Notes |
|
||||
*-------------------------+-------------------------+------------------------+
|
||||
| <<<yarn.nodemanager.resource.memory-gb>>> | | |
|
||||
| | Resource i.e. available memory, in GB, for given <<<NodeManager>>> | |
|
||||
| | | Defines available resources on the <<<NodeManager>>>. |
|
||||
| <<<yarn.nodemanager.resource.memory-mb>>> | | |
|
||||
| | Resource i.e. available physical memory, in MB, for given <<<NodeManager>>> | |
|
||||
| | | Defines total available resources on the <<<NodeManager>>> to be made |
|
||||
| | | available to running containers |
|
||||
*-------------------------+-------------------------+------------------------+
|
||||
| <<<yarn.nodemanager.vmem-pmem-ratio>>> | | |
|
||||
| | Maximum ratio by which virtual memory usage of tasks may exceed |
|
||||
| | physical memory | |
|
||||
| | | The virtual memory usage of each task may exceed its physical memory |
|
||||
| | | limit by this ratio. The total amount of virtual memory used by tasks |
|
||||
| | | on the NodeManager may exceed its physical memory usage by this ratio. |
|
||||
*-------------------------+-------------------------+------------------------+
|
||||
| <<<yarn.nodemanager.local-dirs>>> | | |
|
||||
| | Comma-separated list of paths on the local filesystem where | |
|
||||
|
||||
@ -119,8 +119,8 @@ Add the following configs to your <<<yarn-site.xml>>>
|
||||
</property>
|
||||
|
||||
<property>
|
||||
<name>yarn.nodemanager.resource.memory-gb</name>
|
||||
<value>10</value>
|
||||
<name>yarn.nodemanager.resource.memory-mb</name>
|
||||
<value>10240</value>
|
||||
<description>the amount of memory on the NodeManager in GB</description>
|
||||
</property>
|
||||
|
||||
|
||||
@ -406,7 +406,8 @@ Hadoop MapReduce Next Generation - Writing YARN Applications
|
||||
* Resource capability: Currently, YARN only supports memory based resource
|
||||
requirements so the request should define how much memory is needed. The
|
||||
value is defined in MB and has to less than the max capability of the
|
||||
cluster and an exact multiple of the min capability.
|
||||
cluster and an exact multiple of the min capability. Memory resources
|
||||
correspond to physical memory limits imposed on the task containers.
|
||||
|
||||
* Priority: When asking for sets of containers, an ApplicationMaster may
|
||||
define different priorities to each set. For example, the Map-Reduce
|
||||
@ -774,8 +775,9 @@ Hadoop MapReduce Next Generation - Writing YARN Applications
|
||||
The two things you're interested in are physical memory and virtual memory.
|
||||
If you have exceeded physical memory limits your app is using too much physical
|
||||
memory. If you're running a Java app, you can use -hprof to look at what is
|
||||
taking up space in the heap. If you have exceeded virtual memory, things are
|
||||
slightly more complicated.
|
||||
taking up space in the heap. If you have exceeded virtual memory, you may
|
||||
need to increase the value of the the cluster-wide configuration variable
|
||||
<<<yarn.nodemanager.vmem-pmem-ratio>>>.
|
||||
|
||||
* Useful Links
|
||||
|
||||
|
||||
@ -1232,49 +1232,28 @@
|
||||
</li>
|
||||
|
||||
<li>
|
||||
<code>mapreduce.{map|reduce}.ulimit</code>: The slaves where
|
||||
tasks are run could be configured with a ulimit value that
|
||||
applies a limit to every process that is launched on the slave.
|
||||
If the task, or any child that the task launches (like in
|
||||
streaming), requires more than the configured limit, this option
|
||||
must be used. The value is given in kilobytes. For example, to
|
||||
increase the ulimit to 1G, the option should be set to 1048576.
|
||||
Note that this value is a per process limit. Since it applies
|
||||
to the JVM as well, the heap space given to the JVM through
|
||||
the <code>mapreduce.{map|reduce}.java.opts</code> should be less
|
||||
than the value configured for the ulimit. Otherwise the JVM
|
||||
will not start.
|
||||
</li>
|
||||
|
||||
<li>
|
||||
<code>mapreduce.{map|reduce}.memory.mb</code>: In some
|
||||
environments, administrators might have configured a total limit
|
||||
on the virtual memory used by the entire process tree for a task,
|
||||
including all processes launched recursively by the task or
|
||||
its children, like in streaming. More details about this can be
|
||||
found in the section on
|
||||
<a href="ext:cluster-setup/ConfiguringMemoryParameters">
|
||||
Monitoring Task Memory Usage</a> in the Cluster SetUp guide.
|
||||
If a task requires more virtual memory for its entire tree,
|
||||
this option
|
||||
must be used. The value is given in MB. For example, to set
|
||||
<code>mapreduce.{map|reduce}.memory.mb</code>:
|
||||
This parameter configures how many megabytes of physical memory
|
||||
the job requires for its map and reduce tasks. It must be configured
|
||||
to be slightly larger than the configured Java heap size above,
|
||||
to account for the fact that the JVM uses physical memory beyond
|
||||
just the heap. An overhead of 20% to 30% is usually sufficient.
|
||||
<br/>
|
||||
Note that, the smaller the amount of memory specified for tasks
|
||||
in this configuration, the larger the number of tasks that
|
||||
can be run in parallel.<br/>
|
||||
|
||||
The value is given in MB. For example, to set
|
||||
the limit to 1G, the option should be set to 1024. Note that this
|
||||
value does not automatically influence the per process ulimit or
|
||||
heap space. Hence, you may need to set those parameters as well
|
||||
(as described above) in order to give your tasks the right amount
|
||||
of memory.
|
||||
<br/>
|
||||
If the amount of physical memory used by your task exceeds the
|
||||
configured value, the NodeManager will automatically kill the task.
|
||||
</li>
|
||||
|
||||
<li>
|
||||
<code>mapreduce.{map|reduce}.memory.physical.mb</code>:
|
||||
This parameter is similar to
|
||||
<code>mapreduce.{map|reduce}.memory.mb</code>, except it specifies
|
||||
how much physical memory is required by a task for its entire
|
||||
tree of processes. The parameter is applicable if administrators
|
||||
have configured a total limit on the physical memory used by
|
||||
all MapReduce tasks.
|
||||
</li>
|
||||
|
||||
</ul>
|
||||
|
||||
<p>
|
||||
@ -1297,7 +1276,7 @@
|
||||
<p>
|
||||
Note: The memory related configuration options described above
|
||||
are used only for configuring the launched child tasks from the
|
||||
tasktracker. Configuring the memory options for daemons is documented
|
||||
NodeManager. Configuring the memory options for daemons is documented
|
||||
under
|
||||
<a href="ext:cluster-setup/ConfiguringEnvironmentHadoopDaemons">
|
||||
Configuring the Environment of the Hadoop Daemons</a> (Cluster Setup).
|
||||
|
||||
Loading…
Reference in New Issue
Block a user