zhihai xu created HADOOP-12186:
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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}
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