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https://issues.apache.org/jira/browse/HBASE-11234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008100#comment-14008100
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Anoop Sam John commented on HBASE-11234:
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This issue is reopened. So we dont need a backport Jira I think. Can we close
that Ted?
> 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, 0.96.3, 0.94.21, 0.98.4
>
> Attachments: 11234-94.patch, 11234-96.patch, HBASE-11234.patch
>
>
> As Ted found,
> With this change:
> {noformat}
> 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(
> {noformat}
> 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)
> 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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