Vikas Vishwakarma created HBASE-19024:
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Summary: provide a configurable option to hsync WAL edits to the
disk for better durability
Key: HBASE-19024
URL: https://issues.apache.org/jira/browse/HBASE-19024
Project: HBase
Issue Type: Improvement
Environment:
Reporter: Vikas Vishwakarma
At present we do not have an option to hsync WAL edits to the disk for better
durability. In our local tests we see 10-15% latency impact of using hsync
instead of hflush which is not very high.
We should have a configurable option to hysnc WAL edits instead of just
sync/hflush which will call the corresponding API on the hadoop side. Currently
HBase handles both SYNC_WAL and FSYNC_WAL as the same calling
FSDataOutputStream sync/hflush on the hadoop side. This can be modified to let
FSYNC_WAL call hsync on the hadoop side instead of sync/hflush. We can keep the
default value to sync as the current behavior and hsync can be enabled based on
explicit configuration.
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