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https://issues.apache.org/jira/browse/NIFI-4376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16163526#comment-16163526
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ASF subversion and git services commented on NIFI-4376:
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Commit 7423b41e3cfbace8a01ca9734521ae49117dbba8 in nifi's branch
refs/heads/master from [~ijokarumawak]
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=7423b41 ]
NIFI-4376: Remove expired S2S request from internal queue. This closes #2144.
Before this fix, expired requests stay in the queue and blocks newly
received requests to be offerred.
> Expired requests stay in StansdardRootGroupPort request queue and block new
> request to be offered
> -------------------------------------------------------------------------------------------------
>
> Key: NIFI-4376
> URL: https://issues.apache.org/jira/browse/NIFI-4376
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.0.1
> Reporter: Koji Kawamura
> Assignee: Koji Kawamura
>
> If the remote NiFi instance slows down for some reason, and S2S requests have
> been timed out continuously, those timed out requests will remain in the
> internal request queue at StandardRootGroupPort.
> Once number of queued requests becomes 1,000, newly received request can not
> be offered to the queue, and RequestExpiredException is thrown. A S2S client
> receives following error in this case:
> {code}
> 2017-09-11 16:32:38,137 ERROR [Timer-Driven Process Thread-4]
> o.a.nifi.remote.StandardRemoteGroupPort
> RemoteGroupPort[name=output,target=http://localhost:8080/nifi] failed to
> communicate with http://localhost:8080/nifi due to java.io.IOException:
> Unexpected response code: 500 errCode:Abort errMessage:<html>
> <head>
> <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
> <title>Error 500 Server Error</title>
> </head>
> <body><h2>HTTP ERROR 500</h2>
> <p>Problem accessing
> /nifi-api/data-transfer/output-ports/6fc7fa6d-015e-1000-27cb-d118b1b0fe13/transactions/73da9bcf-87ec-4594-8e45-a41965c1ed82/flow-files.
> Reason:
> <pre> Server Error</pre></p><h3>Caused by:</h3><pre>java.io.IOException:
> Failed to process the request.
> at
> org.apache.nifi.web.api.DataTransferResource$1.write(DataTransferResource.java:676)
> at
> com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:71)
> ...
> <h3>Caused
> by:</h3><pre>org.apache.nifi.remote.exception.RequestExpiredException
> at
> org.apache.nifi.remote.StandardRootGroupPort.transferFlowFiles(StandardRootGroupPort.java:562)
> at
> org.apache.nifi.web.api.DataTransferResource$1.write(DataTransferResource.java:668)
> {code}
> Once a NiFi instance owning the root group port enters this state, it will
> not be able to recover automatically as its client keeps retrying too often.
> And the returned error message is not clear to understand what is happening.
> The remote NiFi instance should remove already expired requests from its
> internal queue, so that newly received requests are processed correctly, and
> return 'read timeout' error response if it can not be processed and expired.
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