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https://issues.apache.org/jira/browse/HDFS-12255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16122803#comment-16122803
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Mukul Kumar Singh commented on HDFS-12255:
------------------------------------------

[~vagarychen] I have addressed the comments in the v3 patch. Please have a look.

[~anu], the error is being logged in the function which is being called as part 
of the constructor for ContainerCacheFlusher.
So this error will be generated only once for each flusher initialization.

> Block Storage: Cblock should generated unique trace ID for the ops
> ------------------------------------------------------------------
>
>                 Key: HDFS-12255
>                 URL: https://issues.apache.org/jira/browse/HDFS-12255
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Mukul Kumar Singh
>            Assignee: Mukul Kumar Singh
>             Fix For: HDFS-7240
>
>         Attachments: HDFS-12255-HDFS-7240.001.patch, 
> HDFS-12255-HDFS-7240.002.patch, HDFS-12255-HDFS-7240.003.patch
>
>
> Cblock tests fails because cblock does not generate unique trace id for each 
> op.
> {code}
> java.lang.AssertionError: expected:<0> but was:<1051>
>       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:555)
>       at org.junit.Assert.assertEquals(Assert.java:542)
>       at 
> org.apache.hadoop.cblock.TestBufferManager.testRepeatedBlockWrites(TestBufferManager.java:448)
> {code}
> This failure is because of following error.
> {code}
> 017-08-02 17:50:34,569 [Cache Block Writer Thread #4] ERROR 
> scm.XceiverClientHandler (XceiverClientHandler.java:sendCommandAsync(134)) - 
> Command with Trace already exists. Ignoring this command. . Previous Command: 
> java.util.concurrent.CompletableFuture@7847fc2d[Not completed, 1 dependents]
> 2017-08-02 17:50:34,569 [Cache Block Writer Thread #4] ERROR 
> jscsiHelper.ContainerCacheFlusher (BlockWriterTask.java:run(108)) - Writing 
> of block:44 failed, We have attempted to write this block 7 tim
> es to the container container2483304118.Trace ID:
> java.lang.IllegalStateException: Duplicate trace ID. Command with this trace 
> ID is already executing. Please ensure that trace IDs are not reused. ID: 
>         at 
> org.apache.hadoop.scm.XceiverClientHandler.sendCommandAsync(XceiverClientHandler.java:139)
>         at 
> org.apache.hadoop.scm.XceiverClientHandler.sendCommand(XceiverClientHandler.java:114)
>         at 
> org.apache.hadoop.scm.XceiverClient.sendCommand(XceiverClient.java:132)
>         at 
> org.apache.hadoop.scm.storage.ContainerProtocolCalls.writeSmallFile(ContainerProtocolCalls.java:225)
>         at 
> org.apache.hadoop.cblock.jscsiHelper.BlockWriterTask.run(BlockWriterTask.java:97)
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
> {code}



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