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From André Martin (JIRA) <j...@apache.org>
Subject [jira] Created: (HADOOP-3197) Deadlock in DFCClient
Date Sat, 05 Apr 2008 11:33:25 GMT
Deadlock in DFCClient
---------------------

                 Key: HADOOP-3197
                 URL: https://issues.apache.org/jira/browse/HADOOP-3197
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.16.1
            Reporter: André Martin


The DFS Client hangs - attached the thread dump - looks like a dead lock to me...


{noformat}
"ResponseProcessor for block blk_-7822837545361798562" prio=10 tid=0x00002aab993dcc00 nid=0x5241
waiting for monitor entry [0x000000004365e000..0x000000004365ecc0]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.apache.hadoop.dfs.DFSClient$DFSOutputStream$ResponseProcessor.run(DFSClient.java:1771)
	- waiting to lock <0x00002aaaecf2dd08> (a java.util.LinkedList)

"DataStreamer for file /seDNS/mapred-out/18A59C65A91D44E5BA24785DF103D1781BB0137E.cache.new
block blk_-7822837545361798562" prio=10 tid=0x00002aab96a46000 nid=0x523f runnable [0x000000004345c000..0x000000004345cc40]
   java.lang.Thread.State: RUNNABLE
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(Unknown Source)
	at java.net.SocketOutputStream.write(Unknown Source)
	at java.io.BufferedOutputStream.write(Unknown Source)
	- locked <0x00002aaaecf2ec50> (a java.io.BufferedOutputStream)
	at java.io.DataOutputStream.write(Unknown Source)
	- locked <0x00002aaaecf2ec20> (a java.io.DataOutputStream)
	at org.apache.hadoop.dfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:1623)
	- locked <0x00002aaaecf2dd08> (a java.util.LinkedList)


"BackupJobQueuesThread" prio=10 tid=0x00002aab94b94000 nid=0x7cb2 waiting for monitor entry
[0x000000004244c000..0x000000004244cd40]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.writeChunk(DFSClient.java:2117)
	- waiting to lock <0x00002aaaecf2dd08> (a java.util.LinkedList)
	at org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunk(FSOutputSummer.java:141)
	at org.apache.hadoop.fs.FSOutputSummer.flushBuffer(FSOutputSummer.java:124)
	- locked <0x00002aaaecf2e670> (a org.apache.hadoop.dfs.DFSClient$DFSOutputStream)
	at org.apache.hadoop.fs.FSOutputSummer.write(FSOutputSummer.java:58)
	- locked <0x00002aaaecf2e670> (a org.apache.hadoop.dfs.DFSClient$DFSOutputStream)
	at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:36)
	at java.io.DataOutputStream.writeBytes(Unknown Source)
	at sedns.serializer.file.FileSerializerServer.serializeJobQueuesAndCache(FileSerializerServer.java:723)
	- locked <0x00002aaab430fec8> (a java.util.Collections$SynchronizedSet)
	at sedns.pastry.application.ServerApp$BackupJobListThread.run(ServerApp.java:476)

"org.apache.hadoop.dfs.DFSClient$LeaseChecker@3acafb56" daemon prio=10 tid=0x00002aab94bc7c00
nid=0x7ca7 waiting on condition [0x0000000041941000..0x0000000041941bc0]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.hadoop.dfs.DFSClient$LeaseChecker.run(DFSClient.java:597)
	at java.lang.Thread.run(Unknown Source)
{noformat}
 

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