Publish more metrics about mslab
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Key: HBASE-3680
URL: https://issues.apache.org/jira/browse/HBASE-3680
Project: HBase
Issue Type: Improvement
Affects Versions: 0.90.1
Reporter: Jean-Daniel Cryans
Fix For: 0.92.0
We have been using mslab on all our clusters for a while now and it seems it
tends to OOME or send us into GC loops of death a lot more than it used to. For
example, one RS with mslab enabled and 7GB of heap died out of OOME this
afternoon; it had .55GB in the block cache and 2.03GB in the memstores which
doesn't account for much... but it could be that because of mslab a lot of
space was lost in those incomplete 2MB blocks and without metrics we can't
really tell. Compactions were running at the time of the OOME and I see block
cache activity. The average load on that cluster is 531.
We should at least publish the total size of all those blocks and maybe even
take actions based on that (like force flushing).
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