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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11234) FastDiffDeltaEncoder#getFirstKeyInBlock returns wrong result
Date Thu, 22 May 2014 08:48:38 GMT
chunhui shen created HBASE-11234:
------------------------------------

             Summary: FastDiffDeltaEncoder#getFirstKeyInBlock returns wrong result
                 Key: HBASE-11234
                 URL: https://issues.apache.org/jira/browse/HBASE-11234
             Project: HBase
          Issue Type: Bug
            Reporter: chunhui shen
            Assignee: chunhui shen
            Priority: Critical
             Fix For: 0.99.0


As Ted found, 
{format}
With this change:

Index: hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestReversibleScanners.java
===================================================================
--- hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestReversibleScanners.java
(revision 1596579)
+++ hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestReversibleScanners.java
(working copy)
@@ -51,6 +51,7 @@
 import org.apache.hadoop.hbase.filter.FilterList.Operator;
 import org.apache.hadoop.hbase.filter.PageFilter;
 import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
+import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
 import org.apache.hadoop.hbase.io.hfile.CacheConfig;
 import org.apache.hadoop.hbase.io.hfile.HFileContext;
 import org.apache.hadoop.hbase.io.hfile.HFileContextBuilder;
@@ -90,6 +91,7 @@
     CacheConfig cacheConf = new CacheConfig(TEST_UTIL.getConfiguration());
     HFileContextBuilder hcBuilder = new HFileContextBuilder();
     hcBuilder.withBlockSize(2 * 1024);
+    hcBuilder.withDataBlockEncoding(DataBlockEncoding.FAST_DIFF);
     HFileContext hFileContext = hcBuilder.build();
     StoreFile.Writer writer = new StoreFile.WriterBuilder(
         TEST_UTIL.getConfiguration(), cacheConf, fs).withOutputDir(

I got:

java.lang.AssertionError: expected:<testRow0197/testCf:testQual0000/1400712260004/Put/vlen=13/mvcc=5>
but was:<testRow0198/testCf:testQual0000/1400712260004/   Put/vlen=13/mvcc=0>
  at org.junit.Assert.fail(Assert.java:88)
  at org.junit.Assert.failNotEquals(Assert.java:743)
  at org.junit.Assert.assertEquals(Assert.java:118)
  at org.junit.Assert.assertEquals(Assert.java:144)
  at org.apache.hadoop.hbase.regionserver.TestReversibleScanners.seekTestOfReversibleKeyValueScanner(TestReversibleScanners.java:533)
  at org.apache.hadoop.hbase.regionserver.TestReversibleScanners.testReversibleStoreFileScanner(TestReversibleScanners.java:108)
{format}


After debugging, it seems the method of FastDiffDeltaEncoder#getFirstKeyInBlock become broken.
And it will cause hfilescanner#seekBefore returns wrong result.


The solution is simple, see the patch.



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