Yu Li created HBASE-20471:
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Summary: Recheck the design and implementation of FSYNC_WAL
durability for WAL
Key: HBASE-20471
URL: https://issues.apache.org/jira/browse/HBASE-20471
Project: HBase
Issue Type: Task
Reporter: Yu Li
This is something derived from discussion in HBASE-19024 around [this
comment|https://issues.apache.org/jira/browse/HBASE-19024?focusedCommentId=16445592&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16445592]
We have been supplying user the API to set durability per mutation for a long
time, by design the SYNC_WAL durability to call {{FSDataOutputStream#hflush}}
and FSYNC_WAL {{FSDataOutputStream#hsync}}, while in implementation we have
been calling hflush for FSYNC_WAL also until HBASE-19024. Although HBASE-19024
tried to fix the syntax with good willing, the implementation there cannot
assure the FSYNC_WAL edits are truly hsync'ed due to the disruptor mechanism
used in WAL implementation. Here in this JIRA we aim to have more discussion
and give it a complete solution.
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