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https://issues.apache.org/jira/browse/HDFS-10935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604480#comment-15604480
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SammiChen commented on HDFS-10935:
----------------------------------
Hi [~jojochuang], it's found out that this "Checksum mismatches" issue is
because the second checksum(the one with block reconstruct) is wrong. The
checksum is wrong is not because the reconstructed block content is wrong. It's
because the code reuses an existing {{DataChecksum}} object while forgets to
reset this checksum object state to initial state before using it. So the
checksum is contaminated by its old state. I have upload the patch to address
this issue.
> Java-based EC codec does not reconstruct blocks correctly
> ---------------------------------------------------------
>
> Key: HDFS-10935
> URL: https://issues.apache.org/jira/browse/HDFS-10935
> Project: Hadoop HDFS
> Issue Type: Bug
> Environment: JDK 1.8.0_91 on Mac OS X Yosemite 10.10.5
> Reporter: Wei-Chiu Chuang
> Assignee: SammiChen
> Priority: Critical
>
> On my Mac, TestFileChecksum has been been failing since HDFS-10460. However,
> the jenkins jobs have not reported the failures. Maybe it's an issue with my
> Mac or JDK.
> 9 out of 21 tests failed.
> {noformat}
> java.lang.AssertionError: Checksum mismatches!
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.assertTrue(Assert.java:41)
> at
> org.apache.hadoop.hdfs.TestFileChecksum.testStripedFileChecksumWithMissedDataBlocksRangeQuery(TestFileChecksum.java:227)
> at
> org.apache.hadoop.hdfs.TestFileChecksum.testStripedFileChecksumWithMissedDataBlocksRangeQuery10(TestFileChecksum.java:336)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> {noformat}
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