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https://issues.apache.org/jira/browse/HBASE-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222296#comment-14222296
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stack commented on HBASE-5954:
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We have to support a mix of sync and fsync? I suppose we do.
A successful fsync can let go of all handlers with sequenceid < fsync
sequenceid; this would work as our sync currently does.
A successful sync can only let go of all handlers waiting on sync -- can't
release handlers waiting on an fsync.
For #1 above, you'd have highest sync sequenceid and highest fsync sequenceid?
> Allow proper fsync support for HBase
> ------------------------------------
>
> Key: HBASE-5954
> URL: https://issues.apache.org/jira/browse/HBASE-5954
> Project: HBase
> Issue Type: Improvement
> Components: HFile, wal
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Critical
> Fix For: 2.0.0
>
> Attachments: 5954-trunk-hdfs-trunk-v2.txt,
> 5954-trunk-hdfs-trunk-v3.txt, 5954-trunk-hdfs-trunk-v4.txt,
> 5954-trunk-hdfs-trunk-v5.txt, 5954-trunk-hdfs-trunk-v6.txt,
> 5954-trunk-hdfs-trunk.txt, hbase-hdfs-744.txt
>
>
> At least get recommendation into 0.96 doc and some numbers running w/ this
> hdfs feature enabled.
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