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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8258) Make mapreduce tests pass on hadoop2
Date Thu, 04 Apr 2013 01:16:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621618#comment-13621618
] 

Jonathan Hsieh commented on HBASE-8258:
---------------------------------------

Hm.. you are right -- on my setup on April 1 (before the revert of HBASE-7904) trunk runs
I have 21 tests in org.apache.hadoop.hbase.mapreduce.  The TestImportExport cases are actually
flaking between failure and non being reported (hanging?).

Here's my theory from a previous attempt.  I  believe several months ago I narrowed the problem
to hbase and the yarn/mr2 instances writing to different hdfs's.  I might have this flipped
but it was something like hbase would write and read from a the minihdfs cluster's hfds. 
So a table would be written to the minihdfs.  The mr2 export job would read from hbase, but
write data to a its different "local" file system.  The import job would check for files in
its minihdfs cluster and not find them and then fail. 

I'm in the process of confirming if this is still the case.
                
> Make mapreduce tests pass on hadoop2
> ------------------------------------
>
>                 Key: HBASE-8258
>                 URL: https://issues.apache.org/jira/browse/HBASE-8258
>             Project: HBase
>          Issue Type: Bug
>          Components: mapreduce
>            Reporter: stack
>            Priority: Blocker
>             Fix For: 0.95.1
>
>
> HBASE-7904 was a first attempt at making this work but it got lost in the weeds.
> This is a new attempt at making hbase mapreduce jobs run on hadoop2 (w/o breaking mapreduce
on hadoop1)

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