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https://issues.apache.org/jira/browse/ZOOKEEPER-1208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148597#comment-13148597
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Patrick Hunt commented on ZOOKEEPER-1208:
-----------------------------------------
@mahadev session id 0 just means to create a new session (see ClientCnxn). I
ignore the returned sid because the session is tied to the socket (i.e. not
included in subsequent requests by the client).
> Ephemeral node not removed after the client session is long gone
> ----------------------------------------------------------------
>
> Key: ZOOKEEPER-1208
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1208
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.3.3
> Reporter: kishore gopalakrishna
> Assignee: Patrick Hunt
> Priority: Blocker
> Fix For: 3.3.4, 3.4.0, 3.5.0
>
> Attachments: ZOOKEEPER-1208_br33.patch, ZOOKEEPER-1208_br33.patch
>
>
> Copying from email thread.
> We found our ZK server in a state where an ephemeral node still exists after
> a client session is long gone. I used the cons command on each ZK host to
> list all connections and couldn't find the ephemeralOwner id. We are using
> ZK 3.3.3. Has anyone seen this problem?
> I got the following information from the logs.
> The node that still exists is
> /kafka-tracking/consumers/UserPerformanceEvent-<host>/owners/UserPerformanceEvent/529-7
> I saw that the ephemeral owner is 86167322861045079 which is session id
> 0x13220b93e610550.
> After searching in the transaction log of one of the ZK servers found that
> session expired
> 9/22/11 12:17:57 PM PDT session 0x13220b93e610550 cxid 0x74 zxid 0x601bd36f7
> closeSession null
> On digging further into the logs I found that there were multiple sessions
> created in quick succession and every session tried to create the same node.
> But i verified that the sessions were closed and opened in order
> 9/22/11 12:17:56 PM PDT session 0x13220b93e610550 cxid 0x0 zxid 0x601bd36b5
> createSession 6000
> 9/22/11 12:17:57 PM PDT session 0x13220b93e610550 cxid 0x74 zxid 0x601bd36f7
> closeSession null
> 9/22/11 12:17:58 PM PDT session 0x13220b93e610551 cxid 0x0 zxid 0x601bd36f8
> createSession 6000
> 9/22/11 12:17:59 PM PDT session 0x13220b93e610551 cxid 0x74 zxid 0x601bd373a
> closeSession null
> 9/22/11 12:18:00 PM PDT session 0x13220b93e610552 cxid 0x0 zxid 0x601bd373e
> createSession 6000
> 9/22/11 12:18:01 PM PDT session 0x13220b93e610552 cxid 0x6c zxid 0x601bd37a0
> closeSession null
> 9/22/11 12:18:02 PM PDT session 0x13220b93e610553 cxid 0x0 zxid 0x601bd37e9
> createSession 6000
> 9/22/11 12:18:03 PM PDT session 0x13220b93e610553 cxid 0x74 zxid 0x601bd382b
> closeSession null
> 9/22/11 12:18:04 PM PDT session 0x13220b93e610554 cxid 0x0 zxid 0x601bd383c
> createSession 6000
> 9/22/11 12:18:05 PM PDT session 0x13220b93e610554 cxid 0x6a zxid 0x601bd388f
> closeSession null
> 9/22/11 12:18:06 PM PDT session 0x13220b93e610555 cxid 0x0 zxid 0x601bd3895
> createSession 6000
> 9/22/11 12:18:07 PM PDT session 0x13220b93e610555 cxid 0x6a zxid 0x601bd38cd
> closeSession null
> 9/22/11 12:18:10 PM PDT session 0x13220b93e610556 cxid 0x0 zxid 0x601bd38d1
> createSession 6000
> 9/22/11 12:18:11 PM PDT session 0x13220b93e610557 cxid 0x0 zxid 0x601bd38f2
> createSession 6000
> 9/22/11 12:18:11 PM PDT session 0x13220b93e610557 cxid 0x51 zxid 0x601bd396a
> closeSession null
> Here is the log output for the sessions that tried creating the same node
> 9/22/11 12:17:54 PM PDT session 0x13220b93e61054f cxid 0x42 zxid 0x601bd366b
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:17:56 PM PDT session 0x13220b93e610550 cxid 0x42 zxid 0x601bd36ce
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:17:58 PM PDT session 0x13220b93e610551 cxid 0x42 zxid 0x601bd3711
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:00 PM PDT session 0x13220b93e610552 cxid 0x42 zxid 0x601bd3777
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:02 PM PDT session 0x13220b93e610553 cxid 0x42 zxid 0x601bd3802
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:05 PM PDT session 0x13220b93e610554 cxid 0x44 zxid 0x601bd385d
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:07 PM PDT session 0x13220b93e610555 cxid 0x44 zxid 0x601bd38b0
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> 9/22/11 12:18:11 PM PDT session 0x13220b93e610557 cxid 0x52 zxid 0x601bd396b
> create
> '/kafka-tracking/consumers/UserPerformanceEvent-<hostname>/owners/UserPerformanceEvent/529-7
> Let me know if you need additional information.
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