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https://issues.apache.org/jira/browse/HADOOP-12630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15120142#comment-15120142
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Junping Du commented on HADOOP-12630:
-------------------------------------
Move all non-critical pending issues out of 2.6.4 into 2.6.5.
> Misuse of sun.misc.Unsafe by org.apache.hadoop.io.FastByteComparisons causes
> misaligned memory access coredumps
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-12630
> URL: https://issues.apache.org/jira/browse/HADOOP-12630
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: native
> Affects Versions: 2.6.0, 2.7.0, 3.0.0
> Environment: Solaris SPARC
> Reporter: Alan Burlison
> Assignee: Alan Burlison
>
> Misuse of sun.misc.unsafe by {{org.apache.hadoop.io.FastByteComparisons}}
> causes misaligned memory accesses and results in coredumps. Stack traces
> below:
> {code}
> hadoop-tools/hadoop-gridmix/core
> --- called from signal handler with signal 10 (SIGBUS) ---
> ffffffff7717fa40 Unsafe_GetLong (18c000, ffffffff7e2fd6d8, 0, 19,
> ffffffff775d4be0, 10018c000) + 158
> ffffffff70810dcc * sun/misc/Unsafe.getLong(Ljava/lang/Object;J)J+-30004
> ffffffff70810d70 * sun/misc/Unsafe.getLong(Ljava/lang/Object;J)J+0
> ffffffff70806d58 *
> org/apache/hadoop/io/FastByteComparisons$LexicographicalComparerHolder$UnsafeComparer.compareTo([BII[BII)I+91
> (line 405)
> ffffffff70806cb4 *
> org/apache/hadoop/io/FastByteComparisons$LexicographicalComparerHolder$UnsafeComparer.compareTo(Ljava/lang/Object;IILjava/lang/Object;II)I+16
> (line 264)
> ffffffff7080783c *
> org/apache/hadoop/io/FastByteComparisons.compareTo([BII[BII)I+11 (line 92)
> ffffffff70806cb4 *
> org/apache/hadoop/io/WritableComparator.compareBytes([BII[BII)I+8 (line 376)
> ffffffff70806cb4 *
> org/apache/hadoop/mapred/gridmix/GridmixRecord$Comparator.compare([BII[BII)I+61
> (line 522)
> ffffffff70806cb4 *
> org/apache/hadoop/mapred/gridmix/TestGridmixRecord.binSortTest(Lorg/apache/hadoop/mapred/gridmix/GridmixRecord;Lorg/apache/hadoop/mapred/gridmix/GridmixRecord;IILorg/apache/hadoop/io/WritableComparator;)V+280
> (line 268)
> ffffffff70806f44 *
> org/apache/hadoop/mapred/gridmix/TestGridmixRecord.testBaseRecord()V+57 (line
> 482)
> {code}
> This also causes {{hadoop-mapreduce-project/hadoop-mapreduce-examples/core}}
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