Ulrich Geilmann created CURATOR-315:
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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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