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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6868) Skip checksum is broke; are we double-checksumming by default?
Date Sun, 23 Sep 2012 19:16:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461494#comment-13461494
] 

Lars Hofhansl commented on HBASE-6868:
--------------------------------------

We keep going back and forth between different issues. There at least three issues now discussed
here:
# HLogs are not checksummed when dfs.client.read.shortcircuit.skip.checksum and dfs.client.read.shortcircuit
are both true
# double checksumming when dfs.client.read.shortcircuit = true and dfs.client.read.shortcircuit.skip.checksum=false
# local files lingering with DN is down and file was deleted via DFS.

The first two are related.

                
> 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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