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From "Sergey Kirillov (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-14239) OutOfMemoryError when bootstrapping with less than 100GB RAM
Date Wed, 11 Apr 2018 15:05:00 GMT


Sergey Kirillov updated CASSANDRA-14239:
    Attachment: Selection_421.png

> OutOfMemoryError when bootstrapping with less than 100GB RAM
> ------------------------------------------------------------
>                 Key: CASSANDRA-14239
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Details of the bootstrapping Node
>  * ProLiant BL460c G7
>  * 56GB RAM
>  * 2x 146GB 10K HDD (One dedicated for Commitlog, one for Data, Hints and saved_caches)
>  * CentOS 7.4 on SD-Card
>  * /tmp and /var/log on tmpfs
>  * Oracle JDK 1.8.0_151
>  * Cassandra 3.11.1
> Cluster
>  * 10 existing Nodes (Up and Normal)
>            Reporter: J├╝rgen Albersdorfer
>            Priority: Major
>              Labels: materializedviews
>         Attachments: Objects-by-class.csv, Objects-with-biggest-retained-size.csv, Selection_420.png,
Selection_421.png,, cassandra.yaml,,,, jvm.options, jvm_opts.txt, stack-traces.txt
> Hi, I face an issue when bootstrapping a Node having less than 100GB RAM on our 10 Node
C* 3.11.1 Cluster.
> During bootstrap, when I watch the cassandra.log I observe a growth in JVM Heap Old Gen
which gets not significantly freed up any more.
> I know that JVM collects on Old Gen only when really needed. I can see collections, but
there is always a remainder which seems to grow forever without ever getting freed.
> After the Node successfully Joined the Cluster, I can remove the extra RAM I have given
it for bootstrapping without any further effect.
> It feels like Cassandra will not forget about every single byte streamed over the Network
over time during bootstrapping, - which would be a memory leak and a major problem, too.
> I was able to produce a HeapDumpOnOutOfMemoryError from a 56GB Node (40 GB assigned JVM
Heap). YourKit Profiler shows huge amount of Memory allocated for org.apache.cassandra.db.Memtable
(22 GB) org.apache.cassandra.db.rows.BufferCell (19 GB) and java.nio.HeapByteBuffer (11 GB)

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