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https://issues.apache.org/jira/browse/HBASE-6868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461286#comment-13461286
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Lars Hofhansl commented on HBASE-6868:
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So I am looking through the patch in HBASE-5074.
@LiuLei: Did you positively verify that we're not reading the checksums for the
HLogs?
HBASE-5074 introduces HFileSystem, which has a getNoChecksumFs() method, as
well as a getBackingFs() method. The backingFs is not checksummed. Looks like
for the HLog the backingFs is used, which does not have checksums disabled.
> 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
>
>
> 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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