Allow better control of resource consumption in HTable
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                 Key: HBASE-4805
                 URL: https://issues.apache.org/jira/browse/HBASE-4805
             Project: HBase
          Issue Type: Bug
          Components: client
    Affects Versions: 0.94.0
            Reporter: Lars Hofhansl
            Assignee: Lars Hofhansl


>From some internal discussions at Salesforce we concluded that we need better 
>control over the resources (mostly threads) consumed by HTable when used in a 
>AppServer with many client threads.

Since HTable is not thread safe, the only options are cache them (in a custom 
thread local or using HTablePool) or to create them on-demand.

I propose a simple change: Add a new constructor to HTable that takes an 
optional ExecutorService and HConnection instance. That would make HTable a 
pretty lightweight object and we would manage the ES and HC separately.

I'll upload a patch a soon to get some feedback.

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