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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7631) Region w/ few, fat reads was hard to find on a box carrying hundreds of regions
Date Sun, 20 Jan 2013 16:26:12 GMT
stack created HBASE-7631:
----------------------------

             Summary: Region w/ few, fat reads was hard to find on a box carrying hundreds
of regions
                 Key: HBASE-7631
                 URL: https://issues.apache.org/jira/browse/HBASE-7631
             Project: HBase
          Issue Type: Bug
          Components: metrics
            Reporter: stack


Of a sudden on a prod cluster, a table's rows gained girth... hundreds of thousands of rows...
and the application was pulling them all back every time but only once a second or so.  Regionserver
was carrying hundreds of regions.  Was plain that there was lots of network out traffic. 
It was tough figuring which region was the culprit (JD's trick was moving the regions off
one at a time while watching network out traffic on cluster to see whose spiked next -- it
worked but just some time).

If we had per region read/write sizes in metrics, that would have saved a bunch of diagnostic
time.

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