ASF GitHub Bot commented on NIFI-4834:

Github user alopresto commented on the issue:


> ConsumeJMS does not scale when given more than 1 thread
> -------------------------------------------------------
>                 Key: NIFI-4834
>                 URL: https://issues.apache.org/jira/browse/NIFI-4834
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>            Priority: Major
>             Fix For: 1.6.0
> When I run ConsumeJMS against a local broker, the performance is great. 
> However, if I run against a broker that is running remotely with a 75 ms 
> round trip time (i.e., somewhat high latency), then the performance is pretty 
> poor, allowing me to receive only about 30-40 msgs/sec (1-2 MB/sec).
> Increasing the number of threads should result in multiple connections to the 
> JMS Broker, which would provide better throughput. However, when I increase 
> the number of Concurrent Tasks to 10, I see 10 consumers but only a single 
> connection being created, so the throughput is no better (in fact it's a bit 
> slower due to added lock contention).

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