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https://issues.apache.org/jira/browse/CASSANDRA-3494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176775#comment-13176775
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Peter Schuller commented on CASSANDRA-3494:
-------------------------------------------
I did test it, yes. Streaming does work, and it does indeed not retain an idle
thread per destination beyond end of streaming and timeout (verified with
jstack). I'd have to go back to the code again (I also looked at
ThreadPoolExecutor) to address your concern specifically. What problem are you
seeing?
> Streaming is mono-threaded (the bulk loader too by extension)
> -------------------------------------------------------------
>
> Key: CASSANDRA-3494
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3494
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 0.8.0
> Reporter: Sylvain Lebresne
> Assignee: Peter Schuller
> Priority: Minor
> Fix For: 1.1
>
> Attachments: CASSANDRA-3494-0.8-prelim.txt, CASSANDRA-3494-1.0.txt
>
>
> The streamExecutor is define as:
> {noformat}
> streamExecutor_ = new DebuggableThreadPoolExecutor("Streaming",
> Thread.MIN_PRIORITY);
> {noformat}
> In the meantime, in DebuggableThreadPoolExecutor.java:
> {noformat}
> public DebuggableThreadPoolExecutor(String threadPoolName, int priority)
> {
> this(1, Integer.MAX_VALUE, TimeUnit.SECONDS, new
> LinkedBlockingQueue<Runnable>(), new NamedThreadFactory(threadPoolName,
> priority));
> }
> {noformat}
> In other word, since the core pool size is 1 and the queue unbounded, tasks
> will always queued and the executor is essentially mono-threaded.
> This is clearly not necessary since we already have stream throttling
> nowadays. And it could be a limiting factor in the case of the bulk loader.
> Besides, I would venture that this maybe was not the intention, because
> putting the max core size to MAX_VALUE would suggest that the intention was
> to spawn threads on demand.
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