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From "John Sanda (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-12831) OutOfMemoryError with Cassandra 3.0.9
Date Sun, 23 Oct 2016 18:37:58 GMT
John Sanda created CASSANDRA-12831:

             Summary: OutOfMemoryError with Cassandra 3.0.9
                 Key: CASSANDRA-12831
             Project: Cassandra
          Issue Type: Bug
         Environment: Fedora 24  / Java  1.8.0_91 / Cassandra 3.0.9

Mac OS X 10.11.6 / Java 1.8.0_102 / Cassandra 3.0.9
            Reporter: John Sanda
         Attachments: system.log

I have running some tests on a monitoring system I work on and Cassandra is consistently crashing
with OOMEs, and the JVM exists. This is happening in a dev environment with a single node
created with ccm. 

The monitoring server is ingesting 4,000 data points every 10 seconds. Every two hours a job
runs which fetches all raw data from the past two hours. The raw data is compressed, written
to another table, and then deleted. After 3 or 4 runs of the job Cassandra crashes. Initially
I thought that the problem was in my application code, but I am no longer of that opinion
because I set up the same test environment with Cassandra 3.9, and it has been running for
almost 48 hours without error. And I actually increased the load on the 3.9 environment.

I am using version 3.0.1 of the DataStax Java driver. Last night I changed the driver's page
size from the default to 1000, and so far I have not yet seen any errors.

I have attached the log file. I was going to attach one of the heap dumps, but it looks like
they are too big.

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