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https://issues.apache.org/jira/browse/HBASE-1138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665594#action_12665594
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Jim Kellerman commented on HBASE-1138:
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If we make the default block size 1MB, and we write 819200 records of ~1KB,
sync-ing after each 100 writes, we can read 815002 records if the writer
crashes after writing 819200 records.
This increases our record read ability from 84% to 99%.
If users have a record length different from 1KB, they can adjust
hbase.regionserver.hlog.blocksize (default = 1048576) to achieve similar
results.
Patch follows.
> Test that readers opened after a sync can see all data up to the sync
> ---------------------------------------------------------------------
>
> Key: HBASE-1138
> URL: https://issues.apache.org/jira/browse/HBASE-1138
> Project: Hadoop HBase
> Issue Type: Test
> Components: regionserver, test
> Affects Versions: 0.19.0
> Reporter: Jim Kellerman
> Fix For: 0.19.1, 0.20.0
>
>
> Test that readers opened on a file after it has been synced can see all the
> records prior to the sync.
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