Introduce Memstore "backpressure" for writes
--------------------------------------------
Key: HBASE-5333
URL: https://issues.apache.org/jira/browse/HBASE-5333
Project: HBase
Issue Type: Improvement
Reporter: Lars Hofhansl
Currently if the memstore/flush/compaction cannot keep up with the writeload,
we block writers up to hbase.hstore.blockingWaitTime milliseconds (default is
90000).
Would be nice if there was a concept of a soft "backpressure" that slows
writing clients gracefully *before* we reach this condition.
>From the log:
"2012-02-04 00:00:06,963 WARN
org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Region
<table>,,1328313512779.c2761757621ddf8fb78baf5288d71271. has too many store
files; delaying flush up to 90000ms"
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