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From "Enrico Olivelli (Jira)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-2615) Zookeeper server holds onto dead/expired session ids in the watch data structures
Date Fri, 06 Sep 2019 15:46:09 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Enrico Olivelli updated ZOOKEEPER-2615:
---------------------------------------
    Fix Version/s:     (was: 3.5.6)

> Zookeeper server holds onto dead/expired session ids in the watch data structures
> ---------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2615
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2615
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.4.6
>            Reporter: guoping.gp
>            Assignee: Camille Fournier
>            Priority: Major
>             Fix For: 3.6.0, 3.5.7
>
>
> The same issue (https://issues.apache.org/jira/browse/ZOOKEEPER-1382) still can be found
even with zookeeper 3.4.6.
> this issue cause our production zookeeper cluster leak about 1 million watchs, after
restart the server one by one, the watch count decrease to only about 40000.
> I can reproduce the issue on my mac,here it is:
> ------------------------------------------------------------------------
> pguodeMacBook-Air:bin pguo$ echo srvr | nc localhost 6181
> Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
> Latency min/avg/max: 0/1156/128513
> Received: 539
> Sent: 531
> Connections: 1
> Outstanding: 0
> Zxid: 0x100000037
> Mode: follower
> Node count: 5
> ------------------------
> pguodeMacBook-Air:bin pguo$ echo cons | nc localhost 6181
>  /127.0.0.1:55759[1](queued=0,recved=5,sent=5,sid=0x157be2732d0000e,lop=PING,est=1476372631116,to=15000,lcxid=0x1,lzxid=0xffffffffffffffff,lresp=1476372646260,llat=8,minlat=0,avglat=6,maxlat=17)
>  /0:0:0:0:0:0:0:1:55767[0](queued=0,recved=1,sent=0)
> ------------------------
> pguodeMacBook-Air:bin pguo$ echo wchp | nc localhost 6181
> /curator_exists_watch
>        	0x357be48e4d90007
>        	0x357be48e4d90009
>        	0x157be2732d0000e
> as above 4-letter's report shows, 	0x357be48e4d90007 and 0x357be48e4d90009 are leaked
after the two sessions expired 



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