Lars Hofhansl created TEPHRA-299:
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Summary: Executing a large batch delete is very slow
Key: TEPHRA-299
URL: https://issues.apache.org/jira/browse/TEPHRA-299
Project: Tephra
Issue Type: Bug
Affects Versions: 0.15.0-incubating
Reporter: Lars Hofhansl
Assignee: Poorna Chandra
I noticed that batch deletes are quire slow. In the profiler I found that
almost all of the time is spent in
org.apache.hadoop.hbase.regionserver.wal.FSHLog.blockOnSync().
Looking at TransactionProcessor.preDelete it is obvious why:
The batch delete is translated into *single* puts that are added to the region
one by one, so each time the WAL is flushed.
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