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https://issues.apache.org/jira/browse/ACCUMULO-1901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824259#comment-13824259
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Terry Porter commented on ACCUMULO-1901:
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Per this thread:
http://mail-archives.apache.org/mod_mbox/accumulo-user/201311.mbox/%3cCAPnhrdvhgKL+vSK1s-Sq9V+14YZ1cP5kh=kx1+bho9okh1t...@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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