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https://issues.apache.org/jira/browse/HCATALOG-370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423557#comment-13423557
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Rajesh Balamohan commented on HCATALOG-370:
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>>
3. If the finalizer approach is not acceptable for
FinalizableHiveMetaStoreClient, we can have an alternate option of exposing
acquire(), release() by the cached object for implicit cleanup on expiry. But
that would require doing those operations for doing any HiveMetaStoreClient
operation.
>>
Instead of finalize() which is not guaranteed, can we consider 2 additional
steps? First would be to add removalListener() in guava cache. In case the
cache is expired, it would take care of closing the hivemetastoreclient
gracefully. Second step would be to add shutdown hook in JVM, which would
iterate through the cache entries and close them gracefully before JVM shutdown.
> Create a HiveMetaStoreClient cache in hcatalog
> ----------------------------------------------
>
> Key: HCATALOG-370
> URL: https://issues.apache.org/jira/browse/HCATALOG-370
> Project: HCatalog
> Issue Type: Improvement
> Components: client
> Affects Versions: 0.4
> Reporter: Rohini Palaniswamy
> Assignee: Arup Malakar
> Priority: Minor
> Attachments: J370.patch
>
>
> Hcat makes multiple calls to hivemetastore client and every time the
> connection is setup and destroyed which is costly. It would be nice to have a
> centralized cache, that has a connection per unique identifier (ugi,hcat
> server uri and anything else mandatory). Instead of creating clients all over
> the code, it can be retrieved from this cache. Connections in the cache can
> be closed using WeakReference and ReferenceQueue or based on some time
> interval.
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