Already seen this. My question was more on practical limitations on parallelism than doing it right.

Thanks anyways.


On Jan 5, 2016 4:47 PM, "Priyank Shah" <> wrote:
Hi Kashyap,

Please check out 


From: Kashyap Mhaisekar
Reply-To: ""
Date: Tuesday, January 5, 2016 at 1:21 PM
To: ""
Subject: Storm bolt instances - limits

I had a question on the no. of instances of bolts that can be defined on a topology. Here is my use case -
1. 32 GB machine
2. 8 Processors
3. 12 Workers for each box (6700 to 6711)
4. Each worker has been defined with 2G heap and 64mb of XSS. Ulimit for storm is at 1024

My topology has 5 bolts and a spout and If the combined parallelism is above 1000, i see OOM errrors indicating - java.lang.OutOfMemoryError: unable to create new native thread

When this error occurs, topology is getting initialized and has not started processing.

Is there a guideline from resource perspective as to how many instances can be created?