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From Ryan Rawson <ryano...@gmail.com>
Subject Re: Put slows down and eventually blocks
Date Wed, 19 May 2010 06:57:58 GMT
What does your regionserver logs have to say for themselves?

On Tue, May 18, 2010 at 11:55 PM, Geoff Hendrey <ghendrey@decarta.com> wrote:
> I am experiencing a problem in which Put operations transition from
> working just fine, to blocking forever. I am doing Put from a reducer. I
> have tried the following, but none of them prevents the Puts from
> eventually blocking totally in all the reducers, until the task tracker
> kills the task due to 10 minute timeout.
> 1) try using just one reducer (didn't help)
> 2) try Put.setWriteToWall both true and false (didn't help)
> 3) try autoflush true and false. When true, experiment with different
> flush buffer sizes (didn't help)
> I'v been watching the HDFS namenode and datanode logs, and also the
> HBase master and region servers. I am running a 3-node HDFS cluster
> (20.2) sharing same 3 nodes with HBase 20.3. I see no problems in any
> logs, except that the datanode logs eventually stop showing WRITE
> operations (corresponding to the Put operations eventually coming to a
> halt). The HBase shell remains snappy and I can do list and status
> operations and scans without any issue from the shell.
> Anyone ever seen anything like this?
> -geoff
> <blocked::http://www.decarta.com>

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