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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2883) Req/sec in web UIs are way off when regions are moving
Date Tue, 27 Jul 2010 18:57:18 GMT
Req/sec in web UIs are way off when regions are moving
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                 Key: HBASE-2883
                 URL: https://issues.apache.org/jira/browse/HBASE-2883
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.89.20100621, 0.20.5
            Reporter: Jean-Daniel Cryans
             Fix For: 0.90.0


Now that the region servers can heartbeat back to the master as soon as they have a message
(region open, close, etc), they also recompute their metrics. I see two problems:

 - The metrics are recomputed way too often, and by the looks of that code it seems quite
intense.
 - Our UIs are expecting that the value returned by the metrics computation is per second,
but when regions are moving a RS can ping back a few times within a single second. This gives
a very wrong view of the load.

I think it's time we move metrics computation in it's own separate thread.

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