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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Hbase-hdfs CLOSE_WAIT connection problem
Date Wed, 27 Oct 2010 20:44:54 GMT
Moving to user@hbase.apache.org is more appropriate.

If you do a bit of google search, you can see that there's currently
two opened issues regarding CLOSE_WAIT:

- If you have ChecklsumExceptions, this will generate thousands of
opened sockets: https://issues.apache.org/jira/browse/HBASE-2042
- It was also discussed in this jira, also no resolution regarding
CLOSE_WAIT https://issues.apache.org/jira/browse/HBASE-2180

I'd say you should have a look at the region server log and look for
any suspicious exceptions.

Also, "closing" the HTables doesn't release any resource, so this
probably has no effect on your issue.


On Tue, Oct 26, 2010 at 11:51 PM, akhilesh.kumar
<akhilesh.kumar@zapak.co.in> wrote:
> Hi,
>      We are using hbase-0.20.6 with hdfs (single node setup), while pushing
> the data into hbase, using java API's, there are lots of TCP CLOSE_WAIT
> connection crops up. These connections persist for a long time, even for day
> or two. Linux setting for TCP connection is 72 sec. which are overridden by
> hbase java API. Hbase API connection with hdfs data-anode persist with
> CLOSE_WAIT (We are closing all tables after the operation but this is
> showing in netstat command). Anybody having some idea about this problem?
> Regards
> Akhilesh Kumar

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