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HDFS-8899. Erasure Coding: use threadpool for EC recovery tasks on DataNode. Contributed by Rakesh R.

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Change-Id: I9429706ae3c9b10a9274c07b98da6ed54cce192b
This commit is contained in:
Zhe Zhang 2015-09-15 10:43:13 -07:00
parent c2ebab67ac
commit ced438a4bf
3 changed files with 33 additions and 7 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
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@ -424,3 +424,6 @@
HDFS-7351. Document the HDFS Erasure Coding feature.
(umamahesh and Zhe Zhang via wang)
HDFS-8899. Erasure Coding: use threadpool for EC recovery tasks on DataNode.
(Rakesh R via zhz)

2
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -401,6 +401,8 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final int DFS_DATANODE_STRIPED_READ_BUFFER_SIZE_DEFAULT = 64 * 1024;
public static final String DFS_DATANODE_STRIPED_READ_THRESHOLD_MILLIS_KEY = "dfs.datanode.stripedread.threshold.millis";
public static final int DFS_DATANODE_STRIPED_READ_THRESHOLD_MILLIS_DEFAULT = 5000; //5s
public static final String DFS_DATANODE_STRIPED_BLK_RECOVERY_THREADS_KEY = "dfs.datanode.striped.blockrecovery.threads.size";
public static final int DFS_DATANODE_STRIPED_BLK_RECOVERY_THREADS_DEFAULT = 8;
public static final String DFS_DATANODE_DNS_INTERFACE_KEY = "dfs.datanode.dns.interface";
public static final String DFS_DATANODE_DNS_INTERFACE_DEFAULT = "default";
public static final String DFS_DATANODE_DNS_NAMESERVER_KEY = "dfs.datanode.dns.nameserver";

33
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/erasurecode/ErasureCodingWorker.java
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@ -38,6 +38,7 @@
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
@ -92,6 +93,7 @@ public final class ErasureCodingWorker {
private final DataNode datanode;
private final Configuration conf;
private ThreadPoolExecutor STRIPED_BLK_RECOVERY_THREAD_POOL;
private ThreadPoolExecutor STRIPED_READ_THREAD_POOL;
private final int STRIPED_READ_THRESHOLD_MILLIS;
private final int STRIPED_READ_BUFFER_SIZE;
@ -109,6 +111,10 @@ public ErasureCodingWorker(Configuration conf, DataNode datanode) {
STRIPED_READ_BUFFER_SIZE = conf.getInt(
DFSConfigKeys.DFS_DATANODE_STRIPED_READ_BUFFER_SIZE_KEY,
DFSConfigKeys.DFS_DATANODE_STRIPED_READ_BUFFER_SIZE_DEFAULT);
initializeStripedBlkRecoveryThreadPool(conf.getInt(
DFSConfigKeys.DFS_DATANODE_STRIPED_BLK_RECOVERY_THREADS_KEY,
DFSConfigKeys.DFS_DATANODE_STRIPED_BLK_RECOVERY_THREADS_DEFAULT));
}
private RawErasureDecoder newDecoder(int numDataUnits, int numParityUnits) {
@ -142,6 +148,25 @@ public void rejectedExecution(Runnable runnable, ThreadPoolExecutor e) {
STRIPED_READ_THREAD_POOL.allowCoreThreadTimeOut(true);
}
private void initializeStripedBlkRecoveryThreadPool(int num) {
if (LOG.isDebugEnabled()) {
LOG.debug("Using striped block recovery; pool threads=" + num);
}
STRIPED_BLK_RECOVERY_THREAD_POOL = new ThreadPoolExecutor(2, num, 60,
TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(),
new Daemon.DaemonFactory() {
private final AtomicInteger threadIdx = new AtomicInteger(0);
@Override
public Thread newThread(Runnable r) {
Thread t = super.newThread(r);
t.setName("stripedBlockRecovery-" + threadIdx.getAndIncrement());
return t;
}
});
STRIPED_BLK_RECOVERY_THREAD_POOL.allowCoreThreadTimeOut(true);
}
/**
* Handles the Erasure Coding recovery work commands.
*
@ -150,12 +175,8 @@ public void rejectedExecution(Runnable runnable, ThreadPoolExecutor e) {
*/
public void processErasureCodingTasks(Collection<BlockECRecoveryInfo> ecTasks) {
for (BlockECRecoveryInfo recoveryInfo : ecTasks) {
try {
new Daemon(new ReconstructAndTransferBlock(recoveryInfo)).start();
} catch (Throwable e) {
LOG.warn("Failed to recover striped block " +
recoveryInfo.getExtendedBlock().getLocalBlock(), e);
}
STRIPED_BLK_RECOVERY_THREAD_POOL.submit(new ReconstructAndTransferBlock(
recoveryInfo));
}
}