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From "Karthick Sankarachary (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-3777) Redefine Identity Of HBase Configuration
Date Wed, 13 Apr 2011 20:40:05 GMT
Redefine Identity Of HBase Configuration
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                 Key: HBASE-3777
                 URL: https://issues.apache.org/jira/browse/HBASE-3777
             Project: HBase
          Issue Type: Improvement
          Components: client, ipc
    Affects Versions: 0.90.2
            Reporter: Karthick Sankarachary
            Assignee: Karthick Sankarachary
            Priority: Minor
             Fix For: 0.92.0


Judging from the javadoc in {{HConnectionManager}}, sharing connections across multiple clients
going to the same cluster is supposedly a good thing. However, the fact that there is a one-to-one
mapping between a configuration and connection instance, kind of works against that goal.
Specifically, when you create {{HTable}} instances using a given {{Configuration}} instance
and a copy thereof, we end up with two distinct {{HConnection}} instances under the covers.
Is this really expected behavior, especially given that the configuration instance gets cloned
a lot?

Here, I'd like to play devil's advocate and propose that we "deep-compare" {{HBaseConfiguration}}
instances, so that multiple {{HBaseConfiguration}} instances that have the same properties
map to the same {{HConnection}} instance. In case one is "concerned that a single {{HConnection}}
is insufficient for sharing amongst clients",  to quote the javadoc, then one should be able
to mark a given {{HBaseConfiguration}} instance as being "uniquely identifiable".

Note that "sharing connections makes clean up of {{HConnection}} instances a little awkward",
unless of course, you apply the change described in HBASE-3766.

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