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https://issues.apache.org/jira/browse/HBASE-7440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13540782#comment-13540782
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Hudson commented on HBASE-7440:
-------------------------------
Integrated in HBase-TRUNK #3671 (See
[https://builds.apache.org/job/HBase-TRUNK/3671/])
HBASE-7440 ReplicationZookeeper#addPeer is racy (Himanshu) (Revision
1426702)
Result = FAILURE
larsh :
Files :
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/ReplicationZookeeper.java
> ReplicationZookeeper#addPeer is racy
> ------------------------------------
>
> Key: HBASE-7440
> URL: https://issues.apache.org/jira/browse/HBASE-7440
> Project: HBase
> Issue Type: Bug
> Components: Replication
> Affects Versions: 0.94.3
> Reporter: Himanshu Vashishtha
> Assignee: Himanshu Vashishtha
> Fix For: 0.96.0, 0.94.4
>
> Attachments: HBASE-7440-trunk-v0.patch, HBASE-7440-trunk-v1.patch,
> HBASE-7440-v0.patch, HBASE-7440-v1.patch, HBASE-7440-v2.patch
>
>
> While adding a peer, ReplicationZK does the znodes creation in three
> transactions. Create :
> a) peers znode
> b) peerId specific znode, and
> c) peerState znode
> There is a PeerWatcher which invokes getPeer() (after steps b) and c)). If it
> happens that while adding a peer, the control flows to getPeer() and step c)
> has not been processed, it may results in a state where the peer will not be
> added. This happens while running
> TestMasterReplication#testCyclicReplication().
> {code}
> 2012-12-26 07:36:35,187 INFO
> [RegionServer:0;p0120.XXXXX,38423,1356536179470-EventThread]
> zookeeper.RecoverableZooKeeper(447): Node /2/replication/peers/1/peer-state
> already exists and this is not a retry
> 2012-12-26 07:36:35,188 ERROR
> [RegionServer:0;p0120.XXXXX,38423,1356536179470-EventThread]
> regionserver.ReplicationSourceManager$PeersWatcher(527): Error while adding a
> new peer
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
> NodeExists for /2/replication/peers/1/peer-state
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:119)
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
> at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783)
> at
> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.createNonSequential(RecoverableZooKeeper.java:428)
> at
> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.create(RecoverableZooKeeper.java:410)
> at
> org.apache.hadoop.hbase.zookeeper.ZKUtil.createAndWatch(ZKUtil.java:1044)
> at
> org.apache.hadoop.hbase.replication.ReplicationPeer.startStateTracker(ReplicationPeer.java:82)
> at
> org.apache.hadoop.hbase.replication.ReplicationZookeeper.getPeer(ReplicationZookeeper.java:344)
> at
> org.apache.hadoop.hbase.replication.ReplicationZookeeper.connectToPeer(ReplicationZookeeper.java:307)
> at
> org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceManager$PeersWatcher.nodeChildrenChanged(ReplicationSourceManager.java:519)
> at
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:315)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:519)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:495)
> 2012-12-26 07:36:35,188 DEBUG
> [RegionServer:0;p0120.XXXXX,55742,1356536171947-EventThread]
> zookeeper.ZKUtil(1545): regionserver:55742-0x13bd7db39580004 Retrieved 36
> byte(s) of data from znode /1/hbaseid; data=9ce66123-d3e8-4ae9-a249-afe03...
> {code}
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