[jira] [Commented] (HBASE-3996) Support multiple tables and scanners as input to the mapper in map/reduce jobs

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064357#comment-13064357 ] 

stack commented on HBASE-3996:
------------------------------

Check out the patch yourself Eran.  The bulk is reformatting like the following:

{code}
-   * @param out  The output to write to.
-   * @throws IOException When writing the values to the output fails.
+   * 
+   * @param out
+   *          The output to write to.
+   * @throws IOException
+   *           When writing the values to the output fails.
{code}

or

{code}
-    return regionLocation + ":" +
-      Bytes.toStringBinary(startRow) + "," + Bytes.toStringBinary(endRow);
+    return regionLocation + ":" + Bytes.toStringBinary(startRow) + ","
+        + Bytes.toStringBinary(endRow);
{code}

Over in HBASE-3678 is a formatter for eclipse.  Would that help?

> Support multiple tables and scanners as input to the mapper in map/reduce jobs
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-3996
>                 URL: https://issues.apache.org/jira/browse/HBASE-3996
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>            Reporter: Eran Kutner
>             Fix For: 0.90.4
>
>         Attachments: MultiTableInputFormat.patch, TestMultiTableInputFormat.java.patch
>
>
> It seems that in many cases feeding data from multiple tables or multiple scanners on a single table can save a lot of time when running map/reduce jobs.
> I propose a new MultiTableInputFormat class that would allow doing this.

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