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https://issues.apache.org/jira/browse/HDFS-12238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16120410#comment-16120410
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Anu Engineer commented on HDFS-12238:
-------------------------------------

Thanks [~vagarychen] for the comments.

bq. java.lang.IllegalStateException: Duplicate trace ID.
This happens due to 2 conditions.
# Someone is reusing the traceID and calling into the sendCommand.
# A retry operation of the command which is not completed is being attempted. 
I would guess it is the first case, so it is something that should be fixed in 
TestCBlocReadWrite. [~msingh] has a JIRA and probably a patch for that.

bq. java.lang.IllegalArgumentException: Invalid trace ID
This is due to the change the [~ajayydv] did, that is something that we should 
look closer.

bq. , if it finds out request ID is missing, set a random one instead of 
throwing exception...
I don't think we should do it. If we expect the user app to behave in a certain 
way, it should behave in a certain way. We should fix the user app rather than 
work around in the library. Also we have tests that try to send in invalid id 
and expect an exception, then they will start failing.


> Ozone: Add valid trace ID check in sendCommandAsync
> ---------------------------------------------------
>
>                 Key: HDFS-12238
>                 URL: https://issues.apache.org/jira/browse/HDFS-12238
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Anu Engineer
>            Assignee: Ajay Yadav
>              Labels: newbie
>         Attachments: HDFS-12238-HDFS-7240.01.patch
>
>
> In the function {{XceiverClientHandler#sendCommandAsync}} we should add a 
> check 
> {code}
>    if(StringUtils.isEmpty(request.getTraceID())) {
>       throw new IllegalArgumentException("Invalid trace ID");
>     }
> {code}
> To ensure that ozone clients always send a valid trace ID. However, when you 
> do that a set of current tests that do add a valid trace ID will fail. So we 
> need to fix these tests too.
> {code}
>   TestContainerMetrics.testContainerMetrics
>   TestOzoneContainer.testBothGetandPutSmallFile
>   TestOzoneContainer.testCloseContainer
>   TestOzoneContainer.testOzoneContainerViaDataNode
>   TestOzoneContainer.testXcieverClientAsync
>   TestOzoneContainer.testCreateOzoneContainer
>   TestOzoneContainer.testDeleteContainer
>   TestContainerServer.testClientServer
>   TestContainerServer.testClientServerWithContainerDispatcher
>   TestKeys.testPutAndGetKeyWithDnRestart
> {code}
> This is based on a comment from [~vagarychen] in HDFS-11580.



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