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https://issues.apache.org/jira/browse/SOLR-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man updated SOLR-5823:
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Attachment: SOLR-5823.patch
bq. ...if say, the state update thread ends, we know right away we are not a
functioning Overseer any longer. It might be safer to lock that knowledge in
there.
Ah.... yeah, you're right. I went the "volatile boolean alive" route because I
figured that would be more explicit and easier to understand when looking at
the start/close methods, as opposed to subtly looking at the threads -- but i
hadn't considered the case of the Thread's ending themselves.
---
I've updated the patch to rip out thta boolean state variable and instead
implement isAlive() based on the status of the threads. So far so good, the
test still passed.
I also updated the test to interrupt one of the active OverseerThreads -- this
works correctly as far as the "old" overseer realizing it's no longer alive,
but even with a really healthy delay of 30 seconds, the "new" overseer doesn't
seem to go active.
What am i missing? what/when/how should trigger a new leader election when one
of these overseer threads ends?
(FWIW: I used Thread.interrupt() in the test instead of ClosableThread.close()
because as far as i could tell, nothing about how the OverseerThread class
wraps/runs the ClusterStateUpdater & OverseerCollectionProcessor actually
updates the "isClosed()" status of the Runnables if you call
OverseerThread.cose() ... is that bug?)
> 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
>
>
> 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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