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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-5823) Add utility function for internal code to know if it is currently the overseer
Date Tue, 25 Mar 2014 00:45:43 GMT

     [ https://issues.apache.org/jira/browse/SOLR-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hoss Man updated SOLR-5823:
---------------------------

    Attachment: SOLR-5823.patch

bq. In other words - get the elector for the overseer and call cancel election on it.

I started down that route, and it got me past one hurdle, but then when the test tried to
re-use "zkController" (after shutting down "altZk") it wouldn't ever resume being the overseer
... probably because i had completely removed it from the election?

rather then trying to "dig up" i took a step back, and completely started from scratch with
my test, focusing on the treating the ZkController as a black box w/o trying to reach inside
to affect the overseer status -- so in this new patch, i just spin up a random number of nodes,
and then iteratively:
* confirm only one ZKController thinks it's the overseer
* shutdown that ZKController
...until there aren't any nodes left.

The only hitch is in dealing with the fact that it might take some time for the new election
to happen (especially on slow jenkins machines) so i included an edge case check for 0 overseers
and in that case the test sleeps a bit - with a sanity check that we don't go into an infinite
loop if the overseer constantly stays at 0.

[~markrmiller@gmail.com]: what do you think of this patch iteration? both of the current test,
and the implementation of "isAlive()" (you didn't comment on that after my last patch - i
think this fits better with your previous feedback)

> Add utility function for internal code to know if it is currently the overseer
> ------------------------------------------------------------------------------
>
>                 Key: SOLR-5823
>                 URL: https://issues.apache.org/jira/browse/SOLR-5823
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Hoss Man
>         Attachments: SOLR-5823.patch, SOLR-5823.patch, SOLR-5823.patch, SOLR-5823.patch,
SOLR-5823.patch
>
>
> It would be useful if there was some Overseer equivalent to CloudDescriptor.isLeader()
that plugins running in solr could use to know "At this moment, am i the leader?" 



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