[jboss-jira] [JBoss JIRA] Created: (JGRP-979) TCP DataOutputStream.flush() hang

[Bulat Nigmatullin (JIRA)]

TCP DataOutputStream.flush() hang
---------------------------------

                 Key: JGRP-979
                 URL: https://jira.jboss.org/jira/browse/JGRP-979
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.6.10.merge
         Environment: Ubuntu Server Linux:
$ uname -a
Linux jabber04 2.6.27-11-generic #1 SMP Thu Jan 29 19:28:32 UTC 2009 x86_64 GNU/Linux
$ java -version
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) 64-Bit Server VM (build 11.0-b15, mixed mode)
            Reporter: Bulat Nigmatullin
            Assignee: Bela Ban


JGroups cluster consist of 2 nodes. It uses 2 JChannel: one for config purposes, another for data transfer. Sometimes randomly servers hangs up trying to send message to cluster. I think the main reason is this:

"Timer-3,tcp,81.19.94.71:7800" daemon prio=10 tid=0x00007f155c7a1400 nid=0x3eec runnable [0x0000000042f92000..0x0000000042f92c80]
   java.lang.Thread.State: RUNNABLE
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
	at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
	- locked <0x00007f15688678f0> (a java.io.BufferedOutputStream)
	at java.io.DataOutputStream.flush(DataOutputStream.java:123)
	at org.jgroups.blocks.BasicConnectionTable$Connection.doSend(BasicConnectionTable.java:546)
	at org.jgroups.blocks.BasicConnectionTable$Connection._send(BasicConnectionTable.java:522)
	at org.jgroups.blocks.BasicConnectionTable$Connection.send(BasicConnectionTable.java:506)
	at org.jgroups.blocks.BasicConnectionTable.send(BasicConnectionTable.java:322)
	at org.jgroups.protocols.TCP.send(TCP.java:55)
	at org.jgroups.protocols.BasicTCP.sendToSingleMember(BasicTCP.java:219)
	at org.jgroups.protocols.BasicTCP.sendToAllMembers(BasicTCP.java:204)
	at org.jgroups.protocols.TP.doSend(TP.java:1486)
	at org.jgroups.protocols.TP.access$2500(TP.java:49)
	at org.jgroups.protocols.TP$Bundler.sendBundledMessages(TP.java:2059)
	at org.jgroups.protocols.TP$Bundler.access$2900(TP.java:1951)
	at org.jgroups.protocols.TP$Bundler$BundlingTimer.run(TP.java:2088)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)

I've done few thread dumps during 30 minutes and this thread was in this state in every dump. 

If it will help i can send full thread dump.

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