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https://issues.apache.org/jira/browse/HADOOP-12186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B updated HADOOP-12186:
-----------------------------------
Summary: ActiveStandbyElector shouldn't call monitorLockNodeAsync multiple
times (was: ActiveStandbyElector shouldn't call monitorLockNodeAsync before
StatCallback for previous zkClient.exists is received.)
> ActiveStandbyElector shouldn't call monitorLockNodeAsync multiple times
> -----------------------------------------------------------------------
>
> Key: HADOOP-12186
> URL: https://issues.apache.org/jira/browse/HADOOP-12186
> Project: Hadoop Common
> Issue Type: Bug
> Components: ha
> Affects Versions: 2.7.1
> Reporter: zhihai xu
> Assignee: zhihai xu
> Attachments: HADOOP-12186.000.patch
>
>
> ActiveStandbyElector shouldn't call {{monitorLockNodeAsync}} before
> StatCallback for previous {{zkClient.exists}} is received.
> We saw RM shutdown because ActiveStandbyElector retrying monitorLockNodeAsync
> exceeded limit. The following is the logs.
> Based on the log, it looks like multiple {{monitorLockNodeAsync}} are called
> at the same time due to back-to-back SyncConnected event received.
> The current code doesn't prevent {{zkClient.exists}} from being called before
> AsyncCallback.StatCallback for previous {{zkClient.exists}} is received.
> So the retry for {{monitorLockNodeAsync}} doesn't work correctly sometimes.
> {code}
> 2015-07-01 19:24:12,806 INFO org.apache.zookeeper.ClientCnxn: Client session
> timed out, have not heard from server in 6674ms for sessionid
> 0x14e47693cc20007, closing socket connection and attempting reconnect
> 2015-07-01 19:24:12,919 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session disconnected. Entering neutral mode...
> 2015-07-01 19:24:14,704 INFO org.apache.zookeeper.ClientCnxn: Opening socket
> connection to server node-1.internal/192.168.123.3:2181. Will not attempt to
> authenticate using SASL (unknown error)
> 2015-07-01 19:24:14,704 INFO org.apache.zookeeper.ClientCnxn: Socket
> connection established, initiating session, client: /192.168.123.3:43487,
> server: node-1.internal/192.168.123.3:2181
> 2015-07-01 19:24:14,707 INFO org.apache.zookeeper.ClientCnxn: Session
> establishment complete on server node-1.internal/192.168.123.3:2181,
> sessionid = 0x14e47693cc20007, negotiated timeout = 10000
> 2015-07-01 19:24:14,712 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session connected.
> 2015-07-01 19:24:21,374 INFO org.apache.zookeeper.ClientCnxn: Client session
> timed out, have not heard from server in 6667ms for sessionid
> 0x14e47693cc20007, closing socket connection and attempting reconnect
> 2015-07-01 19:24:21,477 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session disconnected. Entering neutral mode...
> 2015-07-01 19:24:22,640 INFO org.apache.zookeeper.ClientCnxn: Opening socket
> connection to server node-1.internal/192.168.123.3:2181. Will not attempt to
> authenticate using SASL (unknown error)
> 2015-07-01 19:24:22,640 INFO org.apache.zookeeper.ClientCnxn: Socket
> connection established, initiating session, client: /192.168.123.3:43526,
> server: node-1.internal/192.168.123.3:2181
> 2015-07-01 19:24:22,641 INFO org.apache.zookeeper.ClientCnxn: Session
> establishment complete on server node-1.internal/192.168.123.3:2181,
> sessionid = 0x14e47693cc20007, negotiated timeout = 10000
> 2015-07-01 19:24:22,642 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session connected.
> 2015-07-01 19:24:29,310 INFO org.apache.zookeeper.ClientCnxn: Client session
> timed out, have not heard from server in 6669ms for sessionid
> 0x14e47693cc20007, closing socket connection and attempting reconnect
> 2015-07-01 19:24:29,413 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session disconnected. Entering neutral mode...
> 2015-07-01 19:24:30,738 INFO org.apache.zookeeper.ClientCnxn: Opening socket
> connection to server node-1.internal/192.168.123.3:2181. Will not attempt to
> authenticate using SASL (unknown error)
> 2015-07-01 19:24:30,739 INFO org.apache.zookeeper.ClientCnxn: Socket
> connection established, initiating session, client: /192.168.123.3:43574,
> server: node-1.internal/192.168.123.3:2181
> 2015-07-01 19:24:30,739 INFO org.apache.zookeeper.ClientCnxn: Session
> establishment complete on server node-1.internal/192.168.123.3:2181,
> sessionid = 0x14e47693cc20007, negotiated timeout = 10000
> 2015-07-01 19:24:30,740 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session connected.
> 2015-07-01 19:24:37,409 INFO org.apache.zookeeper.ClientCnxn: Client session
> timed out, have not heard from server in 6670ms for sessionid
> 0x14e47693cc20007, closing socket connection and attempting reconnect
> 2015-07-01 19:24:37,512 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session disconnected. Entering neutral mode...
> 2015-07-01 19:24:38,979 INFO org.apache.zookeeper.ClientCnxn: Opening socket
> connection to server node-1.internal/192.168.123.3:2181. Will not attempt to
> authenticate using SASL (unknown error)
> 2015-07-01 19:24:38,979 INFO org.apache.zookeeper.ClientCnxn: Socket
> connection established, initiating session, client: /192.168.123.3:43598,
> server: node-1.internal/192.168.123.3:2181
> 2015-07-01 19:24:38,980 INFO org.apache.zookeeper.ClientCnxn: Session
> establishment complete on server node-1.internal/192.168.123.3:2181,
> sessionid = 0x14e47693cc20007, negotiated timeout = 10000
> 2015-07-01 19:24:38,981 INFO org.apache.hadoop.ha.ActiveStandbyElector:
> Session connected.
> 2015-07-01 19:24:45,649 INFO org.apache.zookeeper.ClientCnxn: Client session
> timed out, have not heard from server in 6669ms for sessionid
> 0x14e47693cc20007, closing socket connection and attempting reconnect
> 2015-07-01 19:24:45,752 FATAL org.apache.hadoop.ha.ActiveStandbyElector:
> Received stat error from Zookeeper. code:CONNECTIONLOSS. Not retrying further
> znode monitoring connection errors.
> 2015-07-01 19:24:45,855 INFO org.apache.zookeeper.ZooKeeper: Session:
> 0x14e47693cc20007 closed
> 2015-07-01 19:25:07,932 WARN org.apache.hadoop.ha.ActiveStandbyElector:
> Ignoring stale result from old client with sessionId 0x14e47693cc20007
> 2015-07-01 19:25:07,932 FATAL
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Received a
> org.apache.hadoop.yarn.server.resourcemanager.RMFatalEvent of type
> EMBEDDED_ELECTOR_FAILED. Cause:
> Received stat error from Zookeeper. code:CONNECTIONLOSS. Not retrying further
> znode monitoring connection errors.
> 2015-07-01 19:25:07,932 WARN org.apache.hadoop.ha.ActiveStandbyElector:
> Ignoring stale result from old client with sessionId 0x14e47693cc20007
> 2015-07-01 19:25:07,932 WARN org.apache.hadoop.ha.ActiveStandbyElector:
> Ignoring stale result from old client with sessionId 0x14e47693cc20007
> 2015-07-01 19:25:07,933 WARN org.apache.hadoop.ha.ActiveStandbyElector:
> Ignoring stale result from old client with sessionId 0x14e47693cc20007
> 2015-07-01 19:25:07,933 INFO org.apache.zookeeper.ClientCnxn: EventThread
> shut down
> 2015-07-01 19:25:08,036 INFO org.apache.hadoop.util.ExitUtil: Exiting with
> status 1
> {code}
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