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Date: Fri, 19 Sep 2014 22:44:47 -0700
From: lars hofhansl <larsh@apache.org>
Reply-To: lars hofhansl <larsh@apache.org>
Subject: Re: HBase establishes session with ZooKeeper and close the session
 immediately
To: "user@hbase.apache.org" <user@hbase.apache.org>
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Hi,

can you define "frequently"?
I.e. send a larger snippet of the log. Connecting every few minutes would OK, Multiple times per second would be strange.

-- Lars


________________________________
 From: tobe <tobeg3oogle@gmail.com>
To: "user@hbase.apache.org" <user@hbase.apache.org> 
Sent: Thursday, September 18, 2014 1:50 AM
Subject: HBase establishes session with ZooKeeper and close the session immediately
 

I have found that our RegionServers connect to the ZooKeeper frequently.
They seems to constantly establish the session, close it and reconnect the
ZooKeeper. Here is the log for both server and client sides. I have no idea
why this happens and how to deal with it? We're using HBase 0.94.11 and
ZooKeeper 3.4.4.

The log from HBase RegionServer:

2014-09-18,16:38:17,867 INFO org.apache.zookeeper.ZooKeeper: Initiating
client connection, connectString=10.2.201.74:11000,10.2.201.73:11000,
10.101.10.67:11000,10.101.10.66:11000,10.2.201.75:11000
sessionTimeout=30000
watcher=catalogtracker-on-org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation@69d892a1
2014-09-18,16:38:17,868 INFO
org.apache.zookeeper.client.ZooKeeperSaslClient: Client will use GSSAPI as
SASL mechanism.
2014-09-18,16:38:17,868 INFO org.apache.zookeeper.ClientCnxn: Opening
socket connection to server lg-hadoop-srv-ct01.bj/10.2.201.73:11000. Will
attempt to SASL-authenticate using Login Context section 'Client'
2014-09-18,16:38:17,868 INFO
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: The identifier of
this process is 11787@lg-hadoop-srv-st05.bj
2014-09-18,16:38:17,868 INFO org.apache.zookeeper.ClientCnxn: Socket
connection established to lg-hadoop-srv-ct01.bj/10.2.201.73:11000,
initiating session
2014-09-18,16:38:17,870 INFO org.apache.zookeeper.ClientCnxn: Session
establishment complete on server lg-hadoop-srv-ct01.bj/10.2.201.73:11000,
sessionid = 0x248782700e52b3c, negotiated timeout = 30000
2014-09-18,16:38:17,876 INFO org.apache.zookeeper.ZooKeeper: Session:
0x248782700e52b3c closed
2014-09-18,16:38:17,876 INFO org.apache.zookeeper.ClientCnxn: EventThread
shut down
2014-09-18,16:38:17,878 INFO
org.apache.hadoop.hbase.replication.regionserver.ReplicationSink: Total
replicated: 24

The log from its ZooKeeper server:

2014-09-18,16:38:17,869 INFO
org.apache.zookeeper.server.NIOServerCnxnFactory: [myid:2] Accepted socket
connection from /10.2.201.76:55621
2014-09-18,16:38:17,869 INFO org.apache.zookeeper.server.ZooKeeperServer:
[myid:2] Client attempting to establish new session at /10.2.201.76:55621
2014-09-18,16:38:17,870 INFO org.apache.zookeeper.server.ZooKeeperServer:
[myid:2] Established session 0x248782700e52b3c with negotiated timeout
30000 for client /10.2.201.76:55621
2014-09-18,16:38:17,872 INFO
org.apache.zookeeper.server.auth.SaslServerCallbackHandler: [myid:2]
Successfully authenticated client:
authenticationID=hbase_srv/hadoop@XIAOMI.HADOOP;
authorizationID=hbase_srv/hadoop@XIAOMI.HADOOP.
2014-09-18,16:38:17,872 INFO
org.apache.zookeeper.server.auth.SaslServerCallbackHandler: [myid:2]
Setting authorizedID: hbase_srv
2014-09-18,16:38:17,872 INFO org.apache.zookeeper.server.ZooKeeperServer:
[myid:2] adding SASL authorization for authorizationID: hbase_srv
2014-09-18,16:38:17,877 INFO org.apache.zookeeper.server.NIOServerCnxn:
[myid:2] Closed socket connection for client /10.2.201.76:55621 which had
sessionid 0x248782700e52b3c
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