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From "LiuLei (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6798) HDFS always read checksum form meta file
Date Tue, 18 Sep 2012 10:48:08 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457735#comment-13457735
] 

LiuLei commented on HBASE-6798:
-------------------------------

Anoop Sam John - When we set  dfs.client.read.shortcircuit property to true, HDFS use  local
read,   local read also use the DistributedFileSystem class,  is not LocalFileSystem.
                
> HDFS always read checksum form meta file
> ----------------------------------------
>
>                 Key: HBASE-6798
>                 URL: https://issues.apache.org/jira/browse/HBASE-6798
>             Project: HBase
>          Issue Type: Bug
>          Components: performance
>    Affects Versions: 0.94.0, 0.94.1
>            Reporter: LiuLei
>            Priority: Blocker
>
> I use hbase0.941 and hadoop-0.20.2-cdh3u5 version.
> The HBase support checksums in HBase block cache in HBASE-5074 jira.
> The  HBase  support checksums for decrease the iops of  HDFS, so that HDFS
> dont't need to read the checksum from meta file of block file.
> But in hadoop-0.20.2-cdh3u5 version, BlockSender still read the metadata file even if
the
>  hbase.regionserver.checksum.verify property is ture.

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