Below an excerpt from a single node zk quorum that was at heart of a small
hbase cluster.  Unfortunately the log is not at DEBUG level (I've asked the
gentleman to up the log level meantime).  What it seems to be reporting is
that an exception while closing a session caused it to timeout all connected
sessions.

Here is the line that mentions the exception on close of session.  There is
no stack trace:

2009-11-20 03:41:04,766 WARN org.apache.zookeeper.server.NIOServerCnxn:
Exception causing close of session 0x124bc250d700790 due to
java.io.IOException: Read error

Is it correct that an error at this stage throws out all connected sessions?

Thanks,
St.Ack


2009-11-20 00:00:04,948 INFO org.apache.zookeeper.server.NIOServerCnxn:
Connected to /10.1.20.101:50716 lastZxid 0
2009-11-20 00:00:04,982 INFO org.apache.zookeeper.server.NIOServerCnxn:
Creating new session 0x1250f26319f0016
2009-11-20 00:00:05,051 INFO org.apache.zookeeper.server.NIOServerCnxn:
Finished init of 0x1250f26319f0016 valid:true
2009-11-20 00:00:05,051 WARN
org.apache.zookeeper.server.PrepRequestProcessor: Got exception when
processing sessionid:0x1250f26319f0016 type:create c
xid:0x1 zxid:0xfffffffffffffffe txntype:unknown n/a
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
NodeExists
        at
org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcessor.java:245)
        at
org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.java:114)
2009-11-20 00:00:40,150 WARN
org.apache.zookeeper.server.PrepRequestProcessor: Got exception when
processing sessionid:0x1250f26319f0016 type:create c
xid:0x4 zxid:0xfffffffffffffffe txntype:unknown n/a
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
NodeExists
        at
org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcessor.java:245)
        at
org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.java:114)
2009-11-20 00:00:50,428 WARN org.apache.zookeeper.server.NIOServerCnxn:
Exception causing close of session 0x1250f26319f0016 due to
java.io.IOExceptio
n: Read error
2009-11-20 00:00:50,429 INFO org.apache.zookeeper.server.NIOServerCnxn:
closing session:0x1250f26319f0016 NIOServerCnxn:
java.nio.channels.SocketChann
el[connected local=/10.1.20.101:2181 remote=/10.1.20.101:50716]
2009-11-20 00:01:22,002 INFO org.apache.zookeeper.server.SessionTrackerImpl:
Expiring session 0x1250f26319f0016
2009-11-20 00:01:22,002 INFO org.apache.zookeeper.server.ZooKeeperServer:
Expiring session 0x1250f26319f0016
2009-11-20 00:01:22,002 INFO
org.apache.zookeeper.server.PrepRequestProcessor: Processed session
termination request for id: 0x1250f26319f0016
2009-11-20 03:41:04,766 WARN org.apache.zookeeper.server.NIOServerCnxn:
Exception causing close of session 0x124bc250d700790 due to
java.io.IOExceptio
n: Read error
2009-11-20 03:41:04,864 INFO org.apache.zookeeper.server.SessionTrackerImpl:
Expiring session 0x1250f26319f0000
2009-11-20 03:41:04,927 INFO org.apache.zookeeper.server.ZooKeeperServer:
Expiring session 0x1250f26319f0000
2009-11-20 03:41:04,927 INFO org.apache.zookeeper.server.SessionTrackerImpl:
Expiring session 0x124bc250d7007a2
2009-11-20 03:41:04,927 INFO org.apache.zookeeper.server.ZooKeeperServer:
Expiring session 0x124bc250d7007a2
2009-11-20 03:41:04,927 INFO org.apache.zookeeper.server.SessionTrackerImpl:
Expiring session 0x124bc250d700794
2009-11-20 03:41:04,927 INFO org.apache.zookeeper.server.ZooKeeperServer:
Expiring session 0x124bc250d700794

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