Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-7212

FsDatasetImpl#createTemporary sometimes holds the FSDatasetImpl lock for a very long time

Add voteVotersWatch issueWatchersCreate sub-taskLinkCloneUpdate Comment AuthorReplace String in CommentUpdate Comment VisibilityDelete Comments
    XMLWordPrintableJSON

Details

    • Bug
    • Status: Reopened
    • Major
    • Resolution: Unresolved
    • 2.4.0
    • None
    • datanode
    • None
    • PROD

    Description

      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:

      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)
      

      Has anybody seen this before?

      Attachments

        Issue Links

        Activity

          This comment will be Viewable by All Users Viewable by All Users
          Cancel

          People

            Unassigned Unassigned
            leccine Istvan Szukacs

            Dates

              Created:
              Updated:

              Slack

                Issue deployment