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https://issues.apache.org/jira/browse/HBASE-6868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462410#comment-13462410
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Lars Hofhansl commented on HBASE-6868:
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Oh... I see what you meant before. What we could do is:
# disable HBase checksum by default.
# folks can then enable HBase checksums and dfs.client.read.shortcircuit
together in the respective config files.
# when HBase checksums we enabled dfs.client.read.shortcircuit.skip.checksum
for the noChecksymFs in HFileSystem.
That way we'd have no double checksumming and HLog will be checksummed (because
HLog used the backingFs - not the noChecksumFs).
> 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
>
>
> 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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