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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6868) Skip checksum is broke; are we double-checksumming by default?
Date Tue, 25 Sep 2012 03:49:07 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-6868:
---------------------------------

    Attachment: 6868-0.96-v3.txt

This is what I meant.

Now we document that:
* dfs.client.read.shortcircuit should true
* dfs.client.read.shortcircuit.skip.checksum should be false

That way this is no longer tied to short circuiting in the code. And if short circuiting happens
to be enabled it is always correct to enable dfs.client.read.shortcircuit.skip.checksum if
we want HBase checksum.

Sounds good?
                
> 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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