FAQ
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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  • Jean-Daniel Cryans at Oct 27, 2010 at 8:45 pm
    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.

    J-D

    On Tue, Oct 26, 2010 at 11:51 PM, akhilesh.kumar
    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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