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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-8926) Do not set default GC options in hbase-env.sh
Date Thu, 11 Jul 2013 01:39:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705374#comment-13705374
] 

Andrew Purtell edited comment on HBASE-8926 at 7/11/13 1:39 AM:
----------------------------------------------------------------

Not a big deal. 

bq. How are we going to default to CMS then

Yes, that is what I am arguing, we don't set up any GC in hbase-env.sh, or HBASE_OPTS. Everybody
is going to change this. Every other 'export ...' line in hbase-env.sh is commented out except
for HBASE_OPTS. 

bq. If G1 is used, shouldn't that setting override HBASE_OPTS anyway?

One common method for incrementally updating configuration is to do something effectively
like:

{noformat}
echo "HBASE_OPTS=\"\$HBASE_OPTS foo\"" >> /etc/hbase/conf/hbase-env.sh
{noformat}

It's also trivial to edit hbase-env.sh with sed but since every other setting in the default
hbase-env.sh seems to serve a documentary purpose...
                
      was (Author: apurtell):
    Not a big deal. 

bq. How are we going to default to CMS then

Yes, that is what I am arguing, we don't set up any GC in hbase-env.sh, or HBASE_OPTS. Everybody
is going to change this. Every other setting in hbase-env.sh is commented except for HBASE_OPTS.


bq. If G1 is used, shouldn't that setting override HBASE_OPTS anyway?

One common method for incrementally updating configuration is to do something effectively
like:

{noformat}
echo "HBASE_OPTS=\"\$HBASE_OPTS foo\"" >> /etc/hbase/conf/hbase-env.sh
{noformat}

It's also trivial to edit hbase-env.sh with sed but since every other setting in the default
hbase-env.sh seems to serve a documentary purpose...
                  
> Do not set default GC options in hbase-env.sh
> ---------------------------------------------
>
>                 Key: HBASE-8926
>                 URL: https://issues.apache.org/jira/browse/HBASE-8926
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0, 0.95.2, 0.94.10
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Trivial
>         Attachments: 8926.patch
>
>
> Exporting default GC options in HBASE_OPTS from hbase-env.sh by default can interfere
with some deployment scenarios. We probably shouldn't be doing that.
> Noticed this when using scripts to set up EC2 test clusters for G1 GC. Having "-XX:+UseConcMarkSweepGC"
on the command line in that case will cause the JVMs to fail to launch.

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