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https://issues.apache.org/jira/browse/CASSANDRA-3494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160844#comment-13160844
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Chris Goffinet commented on CASSANDRA-3494:
-------------------------------------------
We actually just ran into this tonight. We had the network bandwidth, but
because it was monothreaded, we couldnt fully saturate the NIC with 1 thread.
It hurt us pretty hard since we needed to transfer 18TB in under 6 hours.
Please increase this.
> 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
> Priority: Minor
>
> 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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