[jira] [Assigned] (HBASE-12716) A bug in RegionSplitter.UniformSplit algorithm

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

     [ https://issues.apache.org/jira/browse/HBASE-12716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Weichen Ye reassigned HBASE-12716:
----------------------------------

    Assignee: Weichen Ye

> A bug in RegionSplitter.UniformSplit algorithm
> ----------------------------------------------
>
>                 Key: HBASE-12716
>                 URL: https://issues.apache.org/jira/browse/HBASE-12716
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.98.6
>            Reporter: Weichen Ye
>            Assignee: Weichen Ye
>
> I`m working for another issues HBASE-12590 and trying to use the UniformSplit algorithm in RegionSplitter. When the last bytes of start key and end key are adjacent in alphabetical order or ASCII order, the UniformSplit algorithm meet an NPE.
> Like startkey: aaa, endkey :aab
>        startkey:1111 endkey: 1112
> For example, we write this simple test code:
> {code}
> import org.apache.hadoop.hbase.util.RegionSplitter.UniformSplit;
> ......
> byte[] a1 = { 'a', 'a', 'a' };
> byte[] a2 = { 'a', 'a', 'b' };
> UniformSplit us = new UniformSplit();
> byte[] mid = us.split(a1, a2);
> ......
> {code}
> We will get the ERROR:
> {code}
> Exception in thread "main" java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.util.RegionSplitter$UniformSplit.split(RegionSplitter.java:986)
> {code}
> We hope this algorithm should be able to calculate the split point with an additional byte. for example:
> "aaa" and "aab", split point= "aaaP"
> "1111" and "1112", split point ="1111P" 



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