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https://issues.apache.org/jira/browse/NIFI-4461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16190237#comment-16190237
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ASF GitHub Bot commented on NIFI-4461:
--------------------------------------
GitHub user markap14 opened a pull request:
https://github.com/apache/nifi/pull/2193
NIFI-4461: When reading from socket channel use blocking mode instead…
… of sleeping; when writing, use a far smaller sleep duration
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You can merge this pull request into a Git repository by running:
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Alternatively you can review and apply these changes as the patch at:
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This closes #2193
----
commit 0cefa7ee8de2abf72008444c5edd19ce96f782d4
Author: Mark Payne <[email protected]>
Date: 2017-10-03T19:55:02Z
NIFI-4461: When reading from socket channel use blocking mode instead of
sleeping; when writing, use a far smaller sleep duration
----
> DistributedMapCacheClient/Server are inefficient when waiting for data to be
> received from socket
> -------------------------------------------------------------------------------------------------
>
> Key: NIFI-4461
> URL: https://issues.apache.org/jira/browse/NIFI-4461
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Reporter: Mark Payne
> Assignee: Mark Payne
> Fix For: 1.5.0
>
>
> The DistributedMapCacheClient and DistributedMapCacheServer use the
> SocketChannelInputStream and SSLSocketChannelInputStream (and output streams)
> for communicating over a socket in non-blocking mode. This is done to allow a
> timeout to occur on a socket write. However, when reading from the socket, it
> ends up calling Thread.sleep(10, TimeUnit.MILLISECONDS) when there is no data
> available, and that can result in extremely slow performance. Instead, we
> should using blocking mode when receiving data because it will throw a
> timeout exception as we desire. When writing, we should continue using
> non-blocking mode but sleep for far less than 10 milliseconds.
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