[jira] [Created] (HADOOP-12186) ActiveStandbyElector shouldn't call monitorLockNodeAsync before StatCallback for previous zkClient.exists is received.

["zhihai xu (JIRA)" <ji...@apache.org>]

zhihai xu created HADOOP-12186:
----------------------------------

             Summary: ActiveStandbyElector shouldn't call monitorLockNodeAsync before StatCallback for previous zkClient.exists is received.
                 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


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}



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)