When under global memstore pressure, may try to flush unflushable regions in a
tight loop
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Key: HBASE-3531
URL: https://issues.apache.org/jira/browse/HBASE-3531
Project: HBase
Issue Type: Bug
Affects Versions: 0.90.1
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Blocker
Fix For: 0.90.1
Ted ran into this in cluster testing. If the largest region is unflushable (eg
it's in the midst of closing during a split, and hence doing its own flush),
the global memstore pressure code doesn't notice this. So, it keeps trying to
flush it, and ignores the false return code from flushRegion.
Instead, we should iterate down the list of regions and keep trying to flush
them until we find one that works.
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