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From Chris Riccomini <>
Subject Re: Samza threads issues
Date Tue, 28 Oct 2014 15:53:01 GMT
Hey Dotan,

We run all of our jobs using SerialGC by default. For a few of our
higher-throughput jobs, we've had better luck with parallel GC or G1, but
in general, serial works fine.


On 10/28/14 8:34 AM, "Dotan Patrich" <> wrote:

>Hi All,
>I encountered some issues caused by having too many threads for a user on
>linux CentOS. Investigating this deeper, it turned out that the JVM spawn
>over 31 threads per process for GC. Having about 18 Samza processes
>on the machine we soon got near to the 1000 threads limit per user.
>I was thinking of running the Samza JVM with SerialGC instead of parallel
>GC to avoid having so many threads in the environment. In addition,
>theoretically this seems to be better fitted for situations where we
>throughput over latency in a single-core environments (this is roughly
>we Samza tasks is assigned with).
>Before doing so, I would really appreciate you insights - did anyone
>encountered this issue before? Does changing the GC to be serial is a good

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