Pierre Salagnac created SOLR-17971:
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Summary: REBALANCELEADERS command is horribly slow with
distributed cluster processing
Key: SOLR-17971
URL: https://issues.apache.org/jira/browse/SOLR-17971
Project: Solr
Issue Type: Improvement
Affects Versions: 9.0
Reporter: Pierre Salagnac
Internally, the {{REBALANCELEADERS}} command checks the results of leader
re-assignment requests by looking at overseer result distributed maps.
This is done in {{{}RebalanceLeaders.waitAsyncRequests(){}}}.
When the cluster is configured to run distributed cluster processing (no
overseer), results of leader re-assignment commands are not stored in these
map. This makes the parent {{REBALANCELEADERS}} to wait for a long time and
eventually timeout. Then it continues processing.
That's unclear to me how the commands actually worked, but it seems leaders
were correctly rebalanced even in case of a timeout. So there is no big
functional impact.
Instead of checking the overseer result maps, the parent command should check
the requests status by invoking {{REQUESTSTATUS}} for each asynchronous ID.
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