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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7904) Upgrade hadoop 2.0 dependency to 2.0.4-alpha
Date Fri, 22 Mar 2013 21:49:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611311#comment-13611311
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Siddharth Seth commented on HBASE-7904:
---------------------------------------

bq. Usually configs are out in xml files that we read into our context? The hbase Configuration
adds the hbase-*.xml files to its base set. If tests need specific configs., we add them in
xml and then make sure the Configuration reads them in before test runs. What can't we do
that in this case rather than do this config. copy?
To aceess the MiniMRCluster, certain client configs are required. This, along with a lot of
defaults, are provided by the cluster after it is setup. Is it possible to use this, and then
apply addiional configs on top. Something like 
 - config from HDFS is the base (I see fs.default.name being set manually)
 - If MiniMR is required, set it up using the base HDFS config.
 - HBase configs, and test specific configs on top of this (without attempting to set MR/HDFS
parameters)
I'm sure HBase has similar client configs - which need to be loaded to access the MiniHBaseCluster.
How are clients expected to use this ?


bq. Why we even specifying addresses? Why are there not defaults that just work in say the
standalone case so downstream projects don't even have to be concerned w/ setting this stuff?
To allow parallel MiniClusters (different ports).

bq. After reading reams of commentary by you pasting logs both here and over in yarn issues,
I am still not clear what the problem is. It seems like my comment above on exit code 137
being code for OOME seems to be pertinent given cited YARN issue to disable mem checks (could
we up the heap and have this stuff pass?) but I have no clue on how far we are from resolution
or what action to take upstream. I think I now know what is wanted regards config reading
over in YARN-449 seeing Siddharth Seth comments there but that issue seems to have run off
into the weeds.... Figuring what is needed should not be this hard.
137 implies a kill -9 afaik. That's what the NodeManager/TT will eventually send out to containers.
Note: This could be seen in case of successful MR tasks as well.
"Up the heap" is not the main issue here. JVMs are not going OOM, they're being killed by
YARN resource monitoring. 
After MR-5083 is committed (and snapshot published to mvn), can we trigger another run of
the HBase tests - that should eliminate potential random failures caused by parallel tests.
                
> Upgrade hadoop 2.0 dependency to 2.0.4-alpha
> --------------------------------------------
>
>                 Key: HBASE-7904
>                 URL: https://issues.apache.org/jira/browse/HBASE-7904
>             Project: HBase
>          Issue Type: Task
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>            Priority: Critical
>             Fix For: 0.95.0
>
>         Attachments: 7904.txt, 7904-v2-hadoop-2.0.txt, 7904-v2.txt, 7904-v4-hadoop-2.0.txt,
7904-v4.txt, 7904-v4.txt, 7904-v5-hadoop-2.0.txt, 7904-v5.txt, hbase-7904-v3.txt
>
>
> 2.0.3-alpha has been released.
> We should upgrade the dependency.

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