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From "Zhihong Yu (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (HBASE-5140) TableInputFormat subclass to allow N number of splits per region during MR jobs
Date Fri, 06 Jan 2012 20:40:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181572#comment-13181572
] 

Zhihong Yu edited comment on HBASE-5140 at 1/6/12 8:40 PM:
-----------------------------------------------------------

I suggest utilizing this method in HTable:
{code}
  public Pair<byte[][],byte[][]> getStartEndKeys() throws IOException {
{code}
i.e. start and end keys returned by the above method are passed to the splitter interface.
                
      was (Author: zhihyu@ebaysf.com):
    I suggest utilizing this method in HTable:
{code}
  public Pair<byte[][],byte[][]> getStartEndKeys() throws IOException {
{code}
i.e. start and end keys are passed to the splitter interface.
                  
> TableInputFormat subclass to allow N number of splits per region during MR jobs
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-5140
>                 URL: https://issues.apache.org/jira/browse/HBASE-5140
>             Project: HBase
>          Issue Type: New Feature
>          Components: mapreduce
>            Reporter: Josh Wymer
>            Priority: Trivial
>   Original Estimate: 72h
>  Remaining Estimate: 72h
>
> In regards to [HBASE-5138|https://issues.apache.org/jira/browse/HBASE-5138] I am working
on a subclass for the TableInputFormat class that overrides getSplits in order to generate
N number of splits per regions and/or N number of splits per job. The idea is to convert the
startKey and endKey for each region from byte[] to BigDecimal, take the difference, divide
by N, convert back to byte[] and generate splits on the resulting values. Assuming your keys
are fully distributed this should generate splits at nearly the same number of rows per split.
Any suggestions on this issue are welcome.

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