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HDFS-10872. Add MutableRate metrics for FSNamesystemLock operations. Contributed by Erik Krogen.

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This commit is contained in:
Zhe Zhang 2016-11-14 11:05:29 -08:00
parent 6efb8c9c60
commit ff0b99eafe
13 changed files with 410 additions and 228 deletions
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8
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MetricsRegistry.java
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@ -281,6 +281,14 @@ public synchronized MutableRate newRate(String name, String desc,
return ret;
}
public synchronized MutableRatesWithAggregation newRatesWithAggregation(
String name) {
checkMetricName(name);
MutableRatesWithAggregation rates = new MutableRatesWithAggregation();
metricsMap.put(name, rates);
return rates;
}
synchronized void add(String name, MutableMetric metric) {
checkMetricName(name);
metricsMap.put(name, metric);

4
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableMetricsFactory.java
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@ -68,9 +68,7 @@ MutableMetric newForField(Field field, Metric annotation,
return new MutableRates(registry);
}
if (cls == MutableRatesWithAggregation.class) {
MutableRatesWithAggregation rates = new MutableRatesWithAggregation();
registry.add(info.name(), rates);
return rates;
return registry.newRatesWithAggregation(info.name());
}
if (cls == MutableStat.class) {
return registry.newStat(info.name(), info.description(),

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -415,6 +415,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final long
DFS_NAMENODE_MAX_LOCK_HOLD_TO_RELEASE_LEASE_MS_DEFAULT = 25;
public static final String DFS_NAMENODE_LOCK_DETAILED_METRICS_KEY =
"dfs.namenode.lock.detailed-metrics.enabled";
public static final boolean DFS_NAMENODE_LOCK_DETAILED_METRICS_DEFAULT =
false;
// Threshold for how long namenode locks must be held for the
// event to be logged
public static final String DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY =

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CacheManager.java
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@ -959,7 +959,7 @@ public final void processCacheReport(final DatanodeID datanodeID,
processCacheReportImpl(datanode, blockIds);
} finally {
endTime = Time.monotonicNow();
namesystem.writeUnlock();
namesystem.writeUnlock("processCacheReport");
}
// Log the block report processing stats from Namenode perspective

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/Checkpointer.java
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@ -264,7 +264,7 @@ void doCheckpoint() throws IOException {
bnStorage.writeAll();
}
} finally {
backupNode.namesystem.writeUnlock();
backupNode.namesystem.writeUnlock("doCheckpoint");
}
if(cpCmd.needToReturnImage()) {

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ContentSummaryComputationContext.java
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@ -115,7 +115,7 @@ public boolean yield() {
// unlock
dir.readUnlock();
fsn.readUnlock();
fsn.readUnlock("contentSummary");
try {
Thread.sleep(sleepMilliSec, sleepNanoSec);

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogLoader.java
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@ -155,7 +155,7 @@ long loadFSEdits(EditLogInputStream edits, long expectedStartingTxId,
return numEdits;
} finally {
edits.close();
fsNamesys.writeUnlock();
fsNamesys.writeUnlock("loadFSEdits");
prog.endStep(Phase.LOADING_EDITS, step);
}
}
@ -292,7 +292,7 @@ long loadEditRecords(EditLogInputStream in, boolean closeOnExit,
in.close();
}
fsDir.writeUnlock();
fsNamesys.writeUnlock();
fsNamesys.writeUnlock("loadEditRecords");
if (LOG.isTraceEnabled()) {
LOG.trace("replaying edit log finished");

482
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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File diff suppressed because it is too large Load Diff

59
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystemLock.java
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@ -27,11 +27,14 @@
import com.google.common.annotations.VisibleForTesting;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.metrics2.lib.MutableRatesWithAggregation;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.Timer;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_LOCK_DETAILED_METRICS_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_LOCK_DETAILED_METRICS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_READ_LOCK_REPORTING_THRESHOLD_MS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT;
@ -40,11 +43,20 @@
/**
* Mimics a ReentrantReadWriteLock but does not directly implement the interface
* so more sophisticated locking capabilities and logging/metrics are possible.
* {@link org.apache.hadoop.hdfs.DFSConfigKeys#DFS_NAMENODE_LOCK_DETAILED_METRICS_KEY}
* to be true, metrics will be emitted into the FSNamesystem metrics registry
* for each operation which acquires this lock indicating how long the operation
* held the lock for. Note that if a thread dies, metrics produced after the
* most recent snapshot will be lost due to the use of
* {@link MutableRatesWithAggregation}. However since threads are re-used
* between operations this should not generally be an issue.
*/
class FSNamesystemLock {
@VisibleForTesting
protected ReentrantReadWriteLock coarseLock;
private final boolean metricsEnabled;
private final MutableRatesWithAggregation detailedHoldTimeMetrics;
private final Timer timer;
/**
@ -80,12 +92,19 @@ public Long initialValue() {
private final AtomicLong timeStampOfLastReadLockReport = new AtomicLong(0);
private final AtomicLong longestReadLockHeldInterval = new AtomicLong(0);
FSNamesystemLock(Configuration conf) {
this(conf, new Timer());
@VisibleForTesting
static final String OP_NAME_OTHER = "OTHER";
private static final String READ_LOCK_METRIC_PREFIX = "FSNReadLock";
private static final String WRITE_LOCK_METRIC_PREFIX = "FSNWriteLock";
FSNamesystemLock(Configuration conf,
MutableRatesWithAggregation detailedHoldTimeMetrics) {
this(conf, detailedHoldTimeMetrics, new Timer());
}
@VisibleForTesting
FSNamesystemLock(Configuration conf, Timer timer) {
FSNamesystemLock(Configuration conf,
MutableRatesWithAggregation detailedHoldTimeMetrics, Timer timer) {
boolean fair = conf.getBoolean("dfs.namenode.fslock.fair", true);
FSNamesystem.LOG.info("fsLock is fair: " + fair);
this.coarseLock = new ReentrantReadWriteLock(fair);
@ -100,6 +119,12 @@ public Long initialValue() {
this.lockSuppressWarningInterval = conf.getTimeDuration(
DFS_LOCK_SUPPRESS_WARNING_INTERVAL_KEY,
DFS_LOCK_SUPPRESS_WARNING_INTERVAL_DEFAULT, TimeUnit.MILLISECONDS);
this.metricsEnabled = conf.getBoolean(
DFS_NAMENODE_LOCK_DETAILED_METRICS_KEY,
DFS_NAMENODE_LOCK_DETAILED_METRICS_DEFAULT);
FSNamesystem.LOG.info("Detailed lock hold time metrics enabled: " +
this.metricsEnabled);
this.detailedHoldTimeMetrics = detailedHoldTimeMetrics;
}
public void readLock() {
@ -110,12 +135,17 @@ public void readLock() {
}
public void readUnlock() {
readUnlock(OP_NAME_OTHER);
}
public void readUnlock(String opName) {
final boolean needReport = coarseLock.getReadHoldCount() == 1;
final long readLockInterval =
timer.monotonicNow() - readLockHeldTimeStamp.get();
coarseLock.readLock().unlock();
if (needReport) {
addMetric(opName, readLockInterval, false);
readLockHeldTimeStamp.remove();
}
if (needReport && readLockInterval >= this.readLockReportingThreshold) {
@ -164,6 +194,10 @@ public void writeLockInterruptibly() throws InterruptedException {
}
public void writeUnlock() {
writeUnlock(OP_NAME_OTHER);
}
public void writeUnlock(String opName) {
final boolean needReport = coarseLock.getWriteHoldCount() == 1 &&
coarseLock.isWriteLockedByCurrentThread();
final long currentTime = timer.monotonicNow();
@ -191,6 +225,10 @@ public void writeUnlock() {
coarseLock.writeLock().unlock();
if (needReport) {
addMetric(opName, writeLockInterval, true);
}
if (logReport) {
FSNamesystem.LOG.info("FSNamesystem write lock held for " +
writeLockInterval + " ms via\n" +
@ -227,4 +265,19 @@ public Condition newWriteLockCondition() {
public int getQueueLength() {
return coarseLock.getQueueLength();
}
/**
* Add the lock hold time for a recent operation to the metrics.
* @param operationName Name of the operation for which to record the time
* @param value Length of time the lock was held
*/
private void addMetric(String operationName, long value, boolean isWrite) {
if (metricsEnabled) {
String metricName =
(isWrite ? WRITE_LOCK_METRIC_PREFIX : READ_LOCK_METRIC_PREFIX) +
org.apache.commons.lang.StringUtils.capitalize(operationName);
detailedHoldTimeMetrics.add(metricName, value);
}
}
}

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/LeaseManager.java
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@ -329,7 +329,7 @@ public void run() {
needSync = checkLeases();
}
} finally {
fsnamesystem.writeUnlock();
fsnamesystem.writeUnlock("leaseManager");
// lease reassignments should to be sync'ed.
if (needSync) {
fsnamesystem.getEditLog().logSync();

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NamenodeFsck.java
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@ -522,7 +522,7 @@ private LocatedBlocks getBlockLocations(String path, HdfsFileStatus file)
} catch (FileNotFoundException fnfe) {
blocks = null;
} finally {
fsn.readUnlock();
fsn.readUnlock("fsckGetBlockLocations");
}
return blocks;
}

8
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -2678,6 +2678,14 @@
</description>
</property>
<property>
<name>dfs.namenode.lock.detailed-metrics.enabled</name>
<value>false</value>
<description>If true, the namenode will keep track of how long various
operations hold the Namesystem lock for and emit this as metrics.
</description>
</property>
<property>
<name>dfs.namenode.startup.delay.block.deletion.sec</name>
<value>0</value>

59
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystemLock.java
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@ -21,8 +21,12 @@
import com.google.common.base.Supplier;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import org.apache.hadoop.metrics2.lib.MetricsRegistry;
import org.apache.hadoop.metrics2.lib.MutableRatesWithAggregation;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.test.GenericTestUtils.LogCapturer;
import org.apache.hadoop.test.MetricsAsserts;
import org.apache.hadoop.util.FakeTimer;
import org.apache.log4j.Level;
import org.junit.Test;
@ -36,6 +40,8 @@
import java.util.regex.Pattern;
import static org.junit.Assert.*;
import static org.apache.hadoop.test.MetricsAsserts.assertCounter;
import static org.apache.hadoop.test.MetricsAsserts.assertGauge;
/**
* Tests the FSNamesystemLock, looking at lock compatibilities and
@ -48,17 +54,17 @@ public void testFsLockFairness() throws IOException, InterruptedException{
Configuration conf = new Configuration();
conf.setBoolean("dfs.namenode.fslock.fair", true);
FSNamesystemLock fsnLock = new FSNamesystemLock(conf);
FSNamesystemLock fsnLock = new FSNamesystemLock(conf, null);
assertTrue(fsnLock.coarseLock.isFair());
conf.setBoolean("dfs.namenode.fslock.fair", false);
fsnLock = new FSNamesystemLock(conf);
fsnLock = new FSNamesystemLock(conf, null);
assertFalse(fsnLock.coarseLock.isFair());
}
@Test
public void testFSNamesystemLockCompatibility() {
FSNamesystemLock rwLock = new FSNamesystemLock(new Configuration());
FSNamesystemLock rwLock = new FSNamesystemLock(new Configuration(), null);
assertEquals(0, rwLock.getReadHoldCount());
rwLock.readLock();
@ -98,7 +104,7 @@ public void testFSLockGetWaiterCount() throws InterruptedException {
final CountDownLatch latch = new CountDownLatch(threadCount);
final Configuration conf = new Configuration();
conf.setBoolean("dfs.namenode.fslock.fair", true);
final FSNamesystemLock rwLock = new FSNamesystemLock(conf);
final FSNamesystemLock rwLock = new FSNamesystemLock(conf, null);
rwLock.writeLock();
ExecutorService helper = Executors.newFixedThreadPool(threadCount);
@ -141,7 +147,7 @@ public void testFSWriteLockLongHoldingReport() throws Exception {
writeLockSuppressWarningInterval, TimeUnit.MILLISECONDS);
final FakeTimer timer = new FakeTimer();
final FSNamesystemLock fsnLock = new FSNamesystemLock(conf, timer);
final FSNamesystemLock fsnLock = new FSNamesystemLock(conf, null, timer);
timer.advance(writeLockSuppressWarningInterval);
LogCapturer logs = LogCapturer.captureLogs(FSNamesystem.LOG);
@ -216,7 +222,7 @@ public void testFSReadLockLongHoldingReport() throws Exception {
readLockSuppressWarningInterval, TimeUnit.MILLISECONDS);
final FakeTimer timer = new FakeTimer();
final FSNamesystemLock fsnLock = new FSNamesystemLock(conf, timer);
final FSNamesystemLock fsnLock = new FSNamesystemLock(conf, null, timer);
timer.advance(readLockSuppressWarningInterval);
LogCapturer logs = LogCapturer.captureLogs(FSNamesystem.LOG);
@ -303,7 +309,7 @@ public void run() {
t2.join();
// Look for the differentiating class names in the stack trace
String stackTracePatternString =
String.format("INFO.+%s(.+\n){4}\\Q%%s\\E\\.run", readLockLogStmt);
String.format("INFO.+%s(.+\n){5}\\Q%%s\\E\\.run", readLockLogStmt);
Pattern t1Pattern = Pattern.compile(
String.format(stackTracePatternString, t1.getClass().getName()));
assertTrue(t1Pattern.matcher(logs.getOutput()).find());
@ -314,4 +320,43 @@ public void run() {
"Number of suppressed read-lock reports: 2"));
}
@Test
public void testDetailedHoldMetrics() throws Exception {
Configuration conf = new Configuration();
conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_LOCK_DETAILED_METRICS_KEY, true);
FakeTimer timer = new FakeTimer();
MetricsRegistry registry = new MetricsRegistry("Test");
MutableRatesWithAggregation rates =
registry.newRatesWithAggregation("Test");
FSNamesystemLock fsLock = new FSNamesystemLock(conf, rates, timer);
fsLock.readLock();
timer.advance(1);
fsLock.readUnlock("foo");
fsLock.readLock();
timer.advance(2);
fsLock.readUnlock("foo");
fsLock.readLock();
timer.advance(1);
fsLock.readLock();
timer.advance(1);
fsLock.readUnlock("bar");
fsLock.readUnlock("bar");
fsLock.writeLock();
timer.advance(1);
fsLock.writeUnlock("baz");
MetricsRecordBuilder rb = MetricsAsserts.mockMetricsRecordBuilder();
rates.snapshot(rb, true);
assertGauge("FSNReadLockFooAvgTime", 1.5, rb);
assertCounter("FSNReadLockFooNumOps", 2L, rb);
assertGauge("FSNReadLockBarAvgTime", 2.0, rb);
assertCounter("FSNReadLockBarNumOps", 1L, rb);
assertGauge("FSNWriteLockBazAvgTime", 1.0, rb);
assertCounter("FSNWriteLockBazNumOps", 1L, rb);
}
}