[
https://issues.apache.org/jira/browse/ZOOKEEPER-2044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15031195#comment-15031195
]
Germán Blanco commented on ZOOKEEPER-2044:
------------------------------------------
In order to reproduce this problem, I inserted a "Thread.sleep(100)" in the
line just before the one that needs to be modified. Otherwise, I just didn't
get this error.
With that line modified, the problem was solved even with the delay.
I have no idea of how to make a test case for this problem, so I will just
submit the extremely simple patch without a test case.
If anybody wants to reproduce the problem, I created a program that watches in
a znode (receives any event and then subscribes again), and a program that
writes continuously in that znode. The error occurs when the program that
watches is killed.
> CancelledKeyException in zookeeper 3.4.5
> ----------------------------------------
>
> Key: ZOOKEEPER-2044
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2044
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.6
> Environment: Red Hat Enterprise Linux Server release 6.2
> Reporter: shamjith antholi
> Assignee: Germán Blanco
> Priority: Minor
> Fix For: 3.4.7
>
>
> I am getting cancelled key exception in zookeeper (version 3.4.5). Please see
> the log below. When this error is thrown, the connected solr shard is going
> down by giving the error "Failed to index metadata in
> Solr,StackTrace=SolrError: HTTP status 503.Reason:
> {"responseHeader":{"status":503,"QTime":204},"error":{"msg":"ClusterState
> says we are the leader, but locally we don't think so","code":503" and
> ultimately the current activity is going down. Could you please give a
> solution for this ?
> Zookeper log
> ----------------------------------------------------------
> 2014-09-16 02:58:47,799 [myid:1] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@832] - Client
> attempting to renew session 0x24868e7ca980003 at /172.22.0.5:58587
> 2014-09-16 02:58:47,800 [myid:1] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:Learner@107] - Revalidating
> client: 0x24868e7ca980003
> 2014-09-16 02:58:47,802 [myid:1] - INFO
> [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:ZooKeeperServer@588] - Invalid
> session 0x24868e7ca980003 for client /172.22.0.5:58587, probably expired
> 2014-09-16 02:58:47,803 [myid:1] - INFO
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1001] - Closed
> socket connection for client /172.22.0.5:58587 which had sessionid
> 0x24868e7ca980003
> 2014-09-16 02:58:47,810 [myid:1] - ERROR
> [CommitProcessor:1:NIOServerCnxn@180] - Unexpected Exception:
> java.nio.channels.CancelledKeyException
> at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)
> at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:59)
> at
> org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:153)
> at
> org.apache.zookeeper.server.NIOServerCnxn.sendResponse(NIOServerCnxn.java:1076)
> at
> org.apache.zookeeper.server.NIOServerCnxn.process(NIOServerCnxn.java:1113)
> at org.apache.zookeeper.server.DataTree.setWatches(DataTree.java:1327)
> at
> org.apache.zookeeper.server.ZKDatabase.setWatches(ZKDatabase.java:384)
> at
> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:304)
> at
> org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:74)
>
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
