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https://issues.apache.org/jira/browse/HBASE-12716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Weichen Ye updated HBASE-12716:
-------------------------------
Description:
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:
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);
......
------------------------------------------------------------------
We will get the ERROR:
Exception in thread "main" java.lang.NullPointerException
at
org.apache.hadoop.hbase.util.RegionSplitter$UniformSplit.split(RegionSplitter.java:986)
We hope this algorithm should be able to calculate the split point with an
additional byte. for example:
"aaa" and "aab", split point= "aaaP"
"1111" and "1112", split point ="1111P"
was:
I`m working for another issues HBASE-12590 and trying to use the UniformSplit
algorithm in RegionSplitter. When the last bytes of start key and end key are
adjacent in alphabetical order or ASCII order, the UniformSplit algorithm meet
an NPE.
Like startkey: aaa, endkey :aab
startkey:1111 endkey: 1112
For example, we write this simple test code:
###################################################33
import org.apache.hadoop.hbase.util.RegionSplitter.UniformSplit;
......
byte[] a1 = { 'a', 'a', 'a' };
byte[] a2 = { 'a', 'a', 'b' };
UniformSplit us = new UniformSplit();
byte[] mid = us.split(a1, a2);
......
####################################################
We will get the ERROR:
Exception in thread "main" java.lang.NullPointerException
at
org.apache.hadoop.hbase.util.RegionSplitter$UniformSplit.split(RegionSplitter.java:986)
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"
> 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
>
> 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:
> 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);
> ......
> ------------------------------------------------------------------
> We will get the ERROR:
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.util.RegionSplitter$UniformSplit.split(RegionSplitter.java:986)
> 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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