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From "Ulrich Geilmann (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CURATOR-315) Reconnect during InterProcessSemaphoreV2.acquire can lead to orphaned node
Date Mon, 11 Apr 2016 20:55:25 GMT
Ulrich Geilmann created CURATOR-315:
---------------------------------------

             Summary: Reconnect during InterProcessSemaphoreV2.acquire can lead to orphaned
node
                 Key: CURATOR-315
                 URL: https://issues.apache.org/jira/browse/CURATOR-315
             Project: Apache Curator
          Issue Type: Bug
          Components: Recipes
    Affects Versions: 2.10.0, 3.1.0
            Reporter: Ulrich Geilmann


Acquiring and releasing a lease can lead to a leftover node when the client has to reconnect.
Subsequent attempts to acquire a lease on the same path fail when max leases is reached due
to these nodes.

Here's an excerpt of the client log when that happened:
{noformat}
2016-04-11 10:50:03.634+0000 UTC - INFO org.apache.curator.ConnectionState - Connection attempt
unsuccessful after 81663 (greater than max timeout of 60000). Resetting connection and trying
again with a new connection. 
2016-04-11 10:50:03.638+0000 UTC - INFO org.apache.zookeeper.ZooKeeper - Session: 0x15404ee16da0015
closed 
2016-04-11 10:50:03.638+0000 UTC - INFO org.apache.zookeeper.ZooKeeper - Initiating client
connection, connectString=172.16.45.128:2181,172.16.45.192:2181,172.16.45.56:2181 sessionTimeout=60000
watcher=org.apache.curator.ConnectionState@34129c78 
2016-04-11 10:50:03.640+0000 UTC - INFO org.apache.zookeeper.ClientCnxn - Opening socket connection
to server 172.16.45.128/172.16.45.128:2181. Will not attempt to authenticate using SASL (unknown
error) 
2016-04-11 10:50:03.640+0000 UTC - INFO org.apache.zookeeper.ClientCnxn - Socket connection
established to 172.16.45.128/172.16.45.128:2181, initiating session 
2016-04-11 10:50:03.643+0000 UTC - INFO org.apache.zookeeper.ClientCnxn - Session establishment
complete on server 172.16.45.128/172.16.45.128:2181, sessionid = 0x25404f0136d0011, negotiated
timeout = 40000 
2016-04-11 10:50:03.643+0000 UTC - INFO o.a.c.f.s.ConnectionStateManager - State change: RECONNECTED

2016-04-11 10:50:03.644+0000 UTC - INFO o.a.c.f.r.l.InterProcessSemaphoreV2 - Sequential path
not found: /locking/leases/_c_32448fde-1af3-472f-91ff-ec8a4c4b5034-lease-0000000002 
2016-04-11 10:50:03.644+0000 UTC - INFO org.apache.zookeeper.ClientCnxn - EventThread shut
down 
2016-04-11 10:50:06.625+0000 UTC - INFO o.a.c.f.r.l.InterProcessSemaphoreV2 - Lease already
released 
{noformat}




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