No soft flush trigger on global memstore limit
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Key: HBASE-3483
URL: https://issues.apache.org/jira/browse/HBASE-3483
Project: HBase
Issue Type: Bug
Components: performance, regionserver
Affects Versions: 0.90.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Critical
Fix For: 0.90.1
I think this is the reason people see long blocking periods under write load.
Currently when we hit the global memstore limit, we call
reclaimMemStoreMemory() which is synchronized - thus everyone has to wait until
the memory has flushed down to the low water mark. This causes every writer to
block for 10-15 seconds on a large heap.
Instead we should start triggering flushes (in another thread) whenever we're
above the low water mark. Then only block writers when we're above the high
water mark.
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