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https://issues.apache.org/jira/browse/HDFS-14258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766303#comment-16766303
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Íñigo Goiri commented on HDFS-14258:
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Thanks for the unit tests.
Just one minor comment: you added some javadoc comments in the middle to mark
the different phases, we should make them regular comments.
{quote}
And the Math.abs is required. When doing the deltas... if DN is reconfigured
from 50 threads to 45 threads, that is a change of -5. To pull five "tickets"
from the semaphore, to decrease the number of threads that can run, the code
must request to acquire +5 ticket.
{quote}
I got the condition the other way.
So here we will always have a negative number (117 and 120 take care of this).
Does it make sense to just do -1 * delta? Or maybe reverse delta and filter the
0 and negative case?
> Introduce Java Concurrent Package To DataXceiverServer Class
> ------------------------------------------------------------
>
> Key: HDFS-14258
> URL: https://issues.apache.org/jira/browse/HDFS-14258
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.2.0
> Reporter: BELUGA BEHR
> Assignee: BELUGA BEHR
> Priority: Minor
> Attachments: HDFS-14258.1.patch, HDFS-14258.2.patch,
> HDFS-14258.3.patch, HDFS-14258.4.patch, HDFS-14258.5.patch,
> HDFS-14258.6.patch, HDFS-14258.7.patch
>
>
> * Use Java concurrent package to replace current facilities in
> {{DataXceiverServer}}.
> * A little bit of extra clean up
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