Aparna Suresh created SOLR-17396:
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Summary: Reduce thread contention in
ZkStateReader.getCollectionProperties()
Key: SOLR-17396
URL: https://issues.apache.org/jira/browse/SOLR-17396
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Aparna Suresh
Building on
[https://github.com/apache/solr/pull/2585|PR|https://github.com/apache/solr/pull/2585%7CPR]
which delegated Collection Properties Management to
{{{}CollectionPropertiesZkStateReader{}}}, this PR seeks to minimize thread
contention within {{{}CollectionPropertiesZkStateReader{}}}.
Proposal:
* Use collection level locking where relevant instead of synchronizing on
"watchedCollectionProperties"
* With the double checked locking implemented in
CollectionPropertiesZkStateReader, the scope of the synchronized (this) will be
reduced to collection property operations, and no longer be in contention with
the synchronization of unrelated operations on ZkStateReader.
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