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zhouyingchao commented on HDFS-7212: ------------------------------------ I'll create a JIRA for the issue I met and submit a patch. > Huge number of BLOCKED threads rendering DataNodes useless > ---------------------------------------------------------- > > Key: HDFS-7212 > URL: https://issues.apache.org/jira/browse/HDFS-7212 > Project: Hadoop HDFS > Issue Type: Bug > Components: datanode > Affects Versions: 2.4.0 > Environment: PROD > Reporter: Istvan Szukacs > > There are 3000 - 8000 threads in each datanode JVM, blocking the entire VM > and rendering the service unusable, missing heartbeats and stopping data > access. The threads look like this: > {code} > 3415 (state = BLOCKED) > - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame; information may > be imprecise) > - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, > line=186 (Compiled frame) > - > java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt() > @bci=1, line=834 (Interpreted frame) > - > java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(java.util.concurrent.locks.AbstractQueuedSynchronizer$Node, > int) @bci=67, line=867 (Interpreted frame) > - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(int) @bci=17, > line=1197 (Interpreted frame) > - java.util.concurrent.locks.ReentrantLock$NonfairSync.lock() @bci=21, > line=214 (Compiled frame) > - java.util.concurrent.locks.ReentrantLock.lock() @bci=4, line=290 (Compiled > frame) > - > org.apache.hadoop.net.unix.DomainSocketWatcher.add(org.apache.hadoop.net.unix.DomainSocket, > org.apache.hadoop.net.unix.DomainSocketWatcher$Handler) @bci=4, line=286 > (Interpreted frame) > - > org.apache.hadoop.hdfs.server.datanode.ShortCircuitRegistry.createNewMemorySegment(java.lang.String, > org.apache.hadoop.net.unix.DomainSocket) @bci=169, line=283 (Interpreted > frame) > - > org.apache.hadoop.hdfs.server.datanode.DataXceiver.requestShortCircuitShm(java.lang.String) > @bci=212, line=413 (Interpreted frame) > - > org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opRequestShortCircuitShm(java.io.DataInputStream) > @bci=13, line=172 (Interpreted frame) > - > org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(org.apache.hadoop.hdfs.protocol.datatransfer.Op) > @bci=149, line=92 (Compiled frame) > - org.apache.hadoop.hdfs.server.datanode.DataXceiver.run() @bci=510, line=232 > (Compiled frame) > - java.lang.Thread.run() @bci=11, line=744 (Interpreted frame) > {code} > Has anybody seen this before? -- This message was sent by Atlassian JIRA (v6.3.4#6332)