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From "Terry Porter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1901) start-here.sh starts only one GC process even if more are defined
Date Sat, 16 Nov 2013 00:11:21 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824259#comment-13824259
] 

Terry Porter commented on ACCUMULO-1901:
----------------------------------------

Per this thread:
http://mail-archives.apache.org/mod_mbox/accumulo-user/201311.mbox/%3cCAPnhrdvhgKL+vSK1s-Sq9V+14YZ1cP5kh=kX1+BhO9OKH1t2Mg@mail.gmail.com%3e

Josh Elser looked at the code and stated multiple GC processes can run and they will use Zookeeper
to perform failover (like the master process).  I haven't tested failover part yet but hope
to do so next week. I did configure gc to run on my standby master / secondary namenode and
during cluster startup the gc process started as it should.

> start-here.sh starts only one GC process even if more are defined
> -----------------------------------------------------------------
>
>                 Key: ACCUMULO-1901
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1901
>             Project: Accumulo
>          Issue Type: Bug
>          Components: gc, scripts
>    Affects Versions: 1.4.2, 1.4.3, 1.4.4, 1.5.0
>         Environment: Red Hat Enterprise Linux 6.3 64-bit
>            Reporter: Terry Porter
>            Priority: Minor
>              Labels: newbie
>             Fix For: 1.4.5, 1.5.1, 1.6.0
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> Even when a second host is listed in the gc file, the gc process is only ever started
on the first host listed in the gc file.  The issue lies in lines 48-55 in start-here.sh as
shown below:
> {code}
> for host in $HOSTS
> do
>     if [ ${host} = ${GC} ]
>     then
>         ${bin}/start-server.sh $GC gc "garbage collector"
>         break
>     fi
> done
> {code}
> Simple fix:
> {code}
> for host in $HOSTS
> do
>     if grep -q "^${host}\$" $ACCUMULO_HOME/conf/gc
>     then
>         ${bin}/start-server.sh ${host} gc "garbage collector"
>         break
>     fi
> done
> {code}
> This fix works in my 1.4.2 environment.  stop-here.sh already sweeps all possible processes
to kill them, so no fix needed there.
> I posted the fix in case anyone needs this ASAP as this will be my first development
work with an open source project, but I hope to be able to post the fix this weekend.



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