[jira] [Created] (ZOOKEEPER-2615) Zookeeper server holds onto dead/expired session ids in the watch data structures

["guoping.gp (JIRA)" <ji...@apache.org>]

guoping.gp created ZOOKEEPER-2615:
-------------------------------------

             Summary: 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


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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