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https://issues.apache.org/jira/browse/YARN-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16532071#comment-16532071
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Giovanni Matteo Fumarola edited comment on YARN-8435 at 7/3/18 11:43 PM:
-------------------------------------------------------------------------
Thanks [~tanujnay] for testing it and [~NeoMatrix] for the patch.
Few days ago we hit the same bug in one of our test machines.
The javadoc and the comments have few typos and imperfection. I tried to
correct them. [~NeoMatrix] Can you update the patch with typo-free comments
below?
{code:java}
This test validates if the ClientRequestInterceptor chain for the user can
build and init correctly when a multi-client process begins to request
RouterClientRMService for the same user simultaneously.
{code}
{noformat}
ClientTestThread is a thread to simulate a client request to get a
ClientRequestInterceptor for the user.
{noformat}
{noformat}
We start the first thread. It should not finish initing a chainWrapper before
the other thread starts. In this way, the second thread can init at the same
time of the first one. In the end, we validate that the 2 threads get the same
chainWrapper without going into error.{noformat}
was (Author: giovanni.fumarola):
Thanks [~tanujnay] for testing it and [~NeoMatrix] for the patch.
Few days ago we hit the same bug in one of our test machines.
The javadoc and the comments have few typos. I tried to correct them.
[~NeoMatrix] Can you update the patch with typo-free comments below?
{code:java}
This test validates if the ClientRequestInterceptor chain for the user can
build and init correctly when a multi-client process begins to request
RouterClientRMService for the same user simultaneously.
{code}
{noformat}
ClientTestThread is a thread to simulate a client request to get a
ClientRequestInterceptor for the user.
{noformat}
{noformat}
We start the first thread. It should not finish initing a chainWrapper before
the other thread starts. In this way, the second thread can init at the same
time of the first one. In the end, we validate that the 2 threads get the same
chainWrapper without going into error.{noformat}
> NPE when the same client simultaneously contact for the first time Yarn Router
> ------------------------------------------------------------------------------
>
> Key: YARN-8435
> URL: https://issues.apache.org/jira/browse/YARN-8435
> Project: Hadoop YARN
> Issue Type: Bug
> Components: router
> Affects Versions: 2.9.0, 3.0.2
> Reporter: rangjiaheng
> Priority: Critical
> Attachments: YARN-8435.v1.patch, YARN-8435.v2.patch,
> YARN-8435.v3.patch, YARN-8435.v4.patch, YARN-8435.v5.patch, YARN-8435.v6.patch
>
>
> When Two client process (with the same user name and the same hostname) begin
> to connect to yarn router at the same time, to submit application, kill
> application, ... and so on, then a java.lang.NullPointerException may throws
> from yarn router.
>
>
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