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From "Josh Elser (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-2362) Reduce blocking in client API (Tables)
Date Wed, 12 Feb 2014 21:26:20 GMT
Josh Elser created ACCUMULO-2362:

             Summary: Reduce blocking in client API (Tables)
                 Key: ACCUMULO-2362
             Project: Accumulo
          Issue Type: New Feature
          Components: client
    Affects Versions: 1.5.0, 1.4.4
            Reporter: Josh Elser
             Fix For: 1.7.0

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.

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