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https://issues.apache.org/jira/browse/ZOOKEEPER-662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836065#action_12836065
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Patrick Hunt commented on ZOOKEEPER-662:
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Ah, looking back at the code I see we do have a linger timeout of 2 seconds on
those sockets... however it shouldn't result in so many waiting sockets (unless
you are trying a large number of connections per second, which it doesn't seem
to be the case here)
Have you seen this happen again? Or just that one time?
> Too many CLOSE_WAIT socket state on a server
> --------------------------------------------
>
> Key: ZOOKEEPER-662
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-662
> Project: Zookeeper
> Issue Type: Bug
> Components: quorum
> Affects Versions: 3.2.1
> Environment: Linux 2.6.9
> Reporter: Qian Ye
> Fix For: 3.3.0
>
> Attachments: zookeeper.log.2010020105, zookeeper.log.2010020106
>
>
> I have a zookeeper cluster with 5 servers, zookeeper version 3.2.1, here is
> the content in the configure file, zoo.cfg
> ======
> # The number of milliseconds of each tick
> tickTime=2000
> # The number of ticks that the initial
> # synchronization phase can take
> initLimit=5
> # The number of ticks that can pass between
> # sending a request and getting an acknowledgement
> syncLimit=2
> # the directory where the snapshot is stored.
> dataDir=./data/
> # the port at which the clients will connect
> clientPort=8181
> # zookeeper cluster list
> server.100=10.23.253.43:8887:8888
> server.101=10.23.150.29:8887:8888
> server.102=10.23.247.141:8887:8888
> server.200=10.65.20.68:8887:8888
> server.201=10.65.27.21:8887:8888
> =====
> Before the problem happened, the server.200 was the leader. Yesterday
> morning, I found the there were many sockets with the state of CLOSE_WAIT on
> the clientPort (8181), the total was over about 120. Because of these
> CLOSE_WAIT, the server.200 could not accept more connections from the
> clients. The only thing I can do under this situation is restart the
> server.200, at about 2010-02-01 06:06:35. The related log is attached to the
> issue.
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