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https://issues.apache.org/jira/browse/HBASE-6868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462457#comment-13462457
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Lars Hofhansl commented on HBASE-6868:
--------------------------------------
Cool... The only strange spot left is here:
http://hbase.apache.org/xref/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#1473
We're setting useHBaseChecksum to true in the absence of any information from
HFileSystem.
As far as I can tell this only triggered by tests, so I think we're good.
Will commit tomorrow unless there are any objections. Agree on the testing, I
will add this to the testing spreadsheet. I think I will sink the current
0.94.2 RC for this.
> Skip checksum is broke; are we double-checksumming by default?
> --------------------------------------------------------------
>
> Key: HBASE-6868
> URL: https://issues.apache.org/jira/browse/HBASE-6868
> Project: HBase
> Issue Type: Bug
> Components: HFile, wal
> Affects Versions: 0.94.0, 0.94.1
> Reporter: LiuLei
> Priority: Blocker
> Fix For: 0.94.3, 0.96.0
>
> Attachments: 6868-0.96-idea.txt, 6868-0.96-v2.txt, 6868-0.96-v3.txt
>
>
> The HFile contains checksums for decrease the iops, so when Hbase read HFile
> , that dont't need to read the checksum from meta file of HDFS. But HLog
> file of Hbase don't contain the checksum, so when HBase read the HLog, that
> must read checksum from meta file of HDFS. We could add setSkipChecksum per
> file to hdfs or we could write checksums into WAL if this skip checksum
> facility is enabled
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