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https://issues.apache.org/jira/browse/SOLR-3488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295876#comment-13295876
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Yonik Seeley commented on SOLR-3488:
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bq. One thing I recently realized when I put some last minute pieces together
is that I cannot share the same Overseer queue that already exists - it will
cause a deadlock as we wait for states to be registered. Processing the queue
with multiple threads still seemed scary if you were to create a lot of
collections at once - so it seems just safer to use a different queue.
I'm sure you guys have thought about the command queue more than me at this
point... but some brainstorming off the top of my head:
- The type of request could implicitly be be synchronous (must complete before
moving to the next request) or asynchronous
- even for an asynchronous command, the executor for certain types of commands
could be limited to a single thread to avoid complexity (not sure if that helps
your deadlock situation or not)
Telling when something is done:
- could have a flag that requests the command be put on a completed queue,
along with any completion info.
- to prevent unbounded growth of a completed queue, it could have a limited
size (it could be pretty useful to see a recent history of operations)
The work queue thing could be a public interface (i.e. external management
systems could directly make use of it), in which case we'd want to document it
well eventually.
> Create a Collections API for SolrCloud
> --------------------------------------
>
> Key: SOLR-3488
> URL: https://issues.apache.org/jira/browse/SOLR-3488
> Project: Solr
> Issue Type: New Feature
> Components: SolrCloud
> Reporter: Mark Miller
> Assignee: Mark Miller
> Attachments: SOLR-3488.patch, SOLR-3488.patch, SOLR-3488_2.patch
>
>
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