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https://issues.apache.org/jira/browse/ACCUMULO-2362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Elser updated ACCUMULO-2362:
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Description:
Presently, the {{Tables}} class contains a static map of instance to ZooCache
that *many* of the classes in the client API use. The problem with this is that
many of the methods on ZooCache ultimately are synchronized. When multiple
threads using Connectors, TableOperations, Scanners/BatchScanners, and
BatchWriters against the same Accumulo instance, you currently have a massive
synchronization problem.
We should give some thought to heavy, concurrent access to Accumulo client API
calls within the same JVM. Consideration should also be given to the
consistency of wrapping zookeeper with a cache like is presently done.
was:
Presently, the {{Tables}} class contains a static map of instance to ZooCache
that *many* of the . The problem with this is that many of the methods on
ZooCache ultimately are synchronized. When multiple threads using Connectors,
TableOperations, Scanners/BatchScanners, and BatchWriters against the same
Accumulo instance, you currently have a massive synchronization problem.
We should give some thought to heavy, concurrent access to Accumulo client API
calls within the same JVM. Consideration should also be given to the
consistency of wrapping zookeeper with a cache like is presently done.
> Reduce blocking in client API (Tables)
> --------------------------------------
>
> Key: ACCUMULO-2362
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2362
> Project: Accumulo
> Issue Type: New Feature
> Components: client
> Affects Versions: 1.4.4, 1.5.0
> Reporter: Josh Elser
> Fix For: 1.7.0
>
>
> Presently, the {{Tables}} class contains a static map of instance to ZooCache
> that *many* of the classes in the client API use. The problem with this is
> that many of the methods on ZooCache ultimately are synchronized. When
> multiple threads using Connectors, TableOperations, Scanners/BatchScanners,
> and BatchWriters against the same Accumulo instance, you currently have a
> massive synchronization problem.
> We should give some thought to heavy, concurrent access to Accumulo client
> API calls within the same JVM. Consideration should also be given to the
> consistency of wrapping zookeeper with a cache like is presently done.
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