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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8337) Investigate why disabling hadoop short circuit read is required to make recovery tests pass consistently under hadoop2
Date Wed, 24 Apr 2013 01:24:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639941#comment-13639941
] 

Devaraj Das commented on HBASE-8337:
------------------------------------

[~jmhsieh], not sure I fully got the conclusion here. Is the conclusion here that we wait
until a Hadoop release with HDFS-347 happens and then fix this issue; disable SCR for the
unit tests until then? Looking at your last comment, it seems the problem won't happen in
real deployments where all RegionServers run as the same user and HDFS is configured to allow
that user for SCR (which is the most typical deployment scenario).

I am trying to see if we can move this out of the 0.95.x list.
                
> Investigate why disabling hadoop short circuit read is required to make recovery tests
pass consistently under hadoop2
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8337
>                 URL: https://issues.apache.org/jira/browse/HBASE-8337
>             Project: HBase
>          Issue Type: Sub-task
>          Components: hadoop2, test
>    Affects Versions: 0.98.0, 0.95.1
>            Reporter: Jonathan Hsieh
>            Priority: Critical
>             Fix For: 0.95.1
>
>
> HBASE-7636 makes some TestDistributedLogSplitting pass consistently by disabling hdfs
short circuit reads.  
> HBASE-8349 makes datanode node death recovery pass consistently by disabling hdfs short
circuit reads.
> This will likely require configuration modifications to fix and may have different fixes
for hadoop1, hadoop2 (HDFS-2246), and hadoop3 (HDFS-347)...

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