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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