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https://issues.apache.org/jira/browse/HBASE-10656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935902#comment-13935902
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Hudson commented on HBASE-10656:
--------------------------------
FAILURE: Integrated in hbase-0.96-hadoop2 #241 (See
[https://builds.apache.org/job/hbase-0.96-hadoop2/241/])
HBASE-10656 high-scale-lib's Counter depends on Oracle (Sun) JRE, and also has
some bug (stack: rev 1577760)
*
/hbase/branches/0.96/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Counter.java
*
/hbase/branches/0.96/hbase-common/src/test/java/org/apache/hadoop/hbase/util/TestCounter.java
* /hbase/branches/0.96/hbase-server/pom.xml
*
/hbase/branches/0.96/hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RpcServer.java
*
/hbase/branches/0.96/hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/TableMapReduceUtil.java
*
/hbase/branches/0.96/hbase-server/src/main/java/org/apache/hadoop/hbase/metrics/ExactCounterMetric.java
*
/hbase/branches/0.96/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactionTool.java
*
/hbase/branches/0.96/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
*
/hbase/branches/0.96/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
*
/hbase/branches/0.96/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreFlusher.java
* /hbase/branches/0.96/pom.xml
> high-scale-lib's Counter depends on Oracle (Sun) JRE, and also has some bug
> ----------------------------------------------------------------------------
>
> Key: HBASE-10656
> URL: https://issues.apache.org/jira/browse/HBASE-10656
> Project: HBase
> Issue Type: Bug
> Reporter: Hiroshi Ikeda
> Assignee: Hiroshi Ikeda
> Priority: Minor
> Fix For: 0.96.2, 0.98.1, 0.99.0
>
> Attachments: 10656-098.v2.txt, 10656-trunk.v2.patch, 10656.096v2.txt,
> HBASE-10656-0.96.patch, HBASE-10656-trunk.patch, MyCounter.java,
> MyCounter2.java, MyCounterTest.java, MyCounterTest.java,
> PerformanceTestApp.java, output.pdf, output.txt
>
>
> Cliff's high-scale-lib's Counter is used in important classes (for example,
> HRegion) in HBase, but Counter uses sun.misc.Unsafe, that is implementation
> detail of the Java standard library and belongs to Oracle (Sun). That
> consequently makes HBase depend on the specific JRE Implementation.
> To make matters worse, Counter has a bug and you may get wrong result if you
> mix a reading method into your logic calling writing methods.
> In more detail, I think the bug is caused by reading an internal array field
> without resolving memory caching, which is intentional the comment says, but
> storing the read result into a volatile field. That field may be not changed
> after you can see the true values of the array field, and also may be not
> changed after updating the "next" CAT instance's values in some race
> condition when extending CAT instance chain.
> Anyway, it is possible that you create a new alternative class which only
> depends on the standard library. I know Java8 provides its alternative, but
> HBase should support Java6 and Java7 for some time.
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