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From "Ken Weiner (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1655) Usability improvements to HTablePool
Date Thu, 16 Jul 2009 22:14:14 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ken Weiner updated HBASE-1655:

    Status: Patch Available  (was: In Progress)

I've submitted another patch, HBASE-1655-v3.patch, that reflects a different approach taken
to improve HTablePool.  In the new approach, there will be no static methods at all.  Instead,
the normal usage of the class will be to instantiate an HTablePool directly and use the getTable
and putTable methods to get an HTable and return an HTable to the pool.  The pool class will
automatically instantiate a new HTable in the case that no HTable for the given table name
is in the pool OR if the internal pool for that table name is full (has more elements than
its configured max size).  The default max size is Integer.MAX_VALUE.

While we lose the convenience of calling static methods, we gain a design with less code that
is easy to understand, easy to use in an IoC container, and easy to unit test.

This patch also includes a small modification to HTable that allows an instantiation to HTable
with a null HBaseConfiguration object.  This makes it possible to unit test classes such as
HTablePool that internally use an HTable without requiring an environment in which the HTable
can get and use a connection.

Finally, this patch includes modifications to the stargate package reflecting the new HTablePool

Let me know if this is suitable for inclusion in the project.  Thanks to Jon Gray and Stack
for their help and input.

> Usability improvements to HTablePool
> ------------------------------------
>                 Key: HBASE-1655
>                 URL: https://issues.apache.org/jira/browse/HBASE-1655
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: client
>            Reporter: Ken Weiner
>            Assignee: Ken Weiner
>             Fix For: 0.20.0
>         Attachments: HBASE-1655-HTablePool-commented.patch, HBASE-1655-v2-partial.patch,
HBASE-1655-v3.patch, HBASE-1655.patch
> A discussion on the HBase user mailing list (http://markmail.org/thread/7leeha56ny5mwecg)
led to some suggested improvements for the org.apache.hadoop.hbase.client.HTablePool class.
> I will be submitting a patch that contains the following changes to HTablePool:
> * Remove constructors that were not used.
> * Change access to remaining contstructor from public to private to enforce use of the
static factory method getPool.
> * Change internal map from TreeMap to HashMap because I couldn't see any reason it needed
to be sorted.
> * Remove HBaseConfiguration and tableName member variables since they aren't really properties
of the pool itself. They are associated with the HTable that should get instantiated when
one is requested from the pool, but not already there.

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