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https://issues.apache.org/jira/browse/HDFS-7212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14371277#comment-14371277
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Frode Halvorsen commented on HDFS-7212:
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Sometimes the datanoe dosen't come back by itself, and I have to restart it.
Then even more blocks has too many replicas...
> 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?
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