Runaway thread
--------------
Key: ZOOKEEPER-865
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-865
Project: Zookeeper
Issue Type: Bug
Affects Versions: 3.3.1, 3.3.0
Environment: Linux; Java 1.6; x86;
Reporter: Stephen McCants
Priority: Critical
I'm starting a standalone Zookeeper server (v3.3.1). That starts normally and
does not have a runaway thread.
Next, I start an based Eclipse application that is using ZK 3.3.0 to register
itself with the ZooKeeper server (3.3.1). The Eclipse application using the
following arguments to Eclipse:
-Dzoodiscovery.autoStart=true
-Dzoodiscovery.flavor=zoodiscovery.flavor.centralized=smccants.austin.ibm.com
When the Eclipse application starts, the ZK server prints out:
2010-09-03 09:59:46,006 - INFO
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@250] -
Accepted socket connection from /9.53.189.11:42271
2010-09-03 09:59:46,039 - INFO
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioserverc...@776] - Client
attempting to establish new session at /9.53.189.11:42271
2010-09-03 09:59:46,045 - INFO [SyncThread:0:nioserverc...@1579] - Established
session 0x12ad81b90000002 with negotiated timeout 4000 for client
/9.53.189.11:42271
2010-09-03 09:59:46,046 - INFO
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioservercnxn$fact...@250] -
Accepted socket connection from /9.53.189.11:42272
2010-09-03 09:59:46,078 - INFO
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:nioserverc...@776] - Client
attempting to establish new session at /9.53.189.11:42272
2010-09-03 09:59:46,080 - INFO [SyncThread:0:nioserverc...@1579] - Established
session 0x12ad81b90000003 with negotiated timeout 4000 for client
/9.53.189.11:42272
Then both the Eclipse application and the ZK server go into runaway states and
consume 100% of the CPU.
Here is a view from top:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4949 smccants 15 0 597m 78m 5964 S 66.2 1.0 1:03.14
autosubmitter
4876 smccants 17 0 554m 27m 6688 S 30.9 0.3 0:34.74 java
PID 4949 (autosubmitter) is the Eclipse application and is using more than
twice the CPU of PID 4876 (java) which is the ZK server. They will continue in
this state indefinitely.
I can attach a debugger to the Eclipse application and if I stop the thread
named "pool-1-thread-2-SendThread(smccants.austin.ibm.com:2181)" and the
runaway condition stops on both the application and ZK server. However the ZK
server reports:
2010-09-03 10:03:38,001 - INFO [SessionTracker:zookeeperser...@315] - Expiring
session 0x12ad81b90000003, timeout of 4000ms exceeded
2010-09-03 10:03:38,002 - INFO [ProcessThread:-1:preprequestproces...@208] -
Processed session termination for sessionid: 0x12ad81b90000003
2010-09-03 10:03:38,005 - INFO [SyncThread:0:nioserverc...@1434] - Closed
socket connection for client /9.53.189.11:42272 which had sessionid
0x12ad81b90000003
Here is the stack trace from the suspended thread:
EPollArrayWrapper.epollWait(long, int, long, int) line: not available [native
method]
EPollArrayWrapper.poll(long) line: 215
EPollSelectorImpl.doSelect(long) line: 77
EPollSelectorImpl(SelectorImpl).lockAndDoSelect(long) line: 69
EPollSelectorImpl(SelectorImpl).select(long) line: 80
ClientCnxn$SendThread.run() line: 1066
Any ideas what might be going wrong?
Thanks.
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