[jira] [Commented] (CASSANDRA-12662) OOM when using SASI index

["Caleb Rackliffe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822705#comment-15822705 ] 

Caleb Rackliffe commented on CASSANDRA-12662:
---------------------------------------------

[~mkrupits_jb] Have you tried attaching {{strace}} to the running Cassandra process to track down the specific reason for the mapping failure? For instance, the {{ENOMEM}} error code could just mean Cassandra is mapping too many files. (The limit is usually enforced by the kernel in {{/proc/sys/vm/max_map_count}}.)

> OOM when using SASI index
> -------------------------
>
>                 Key: CASSANDRA-12662
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12662
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Linux, 4 CPU cores, 16Gb RAM, Cassandra process utilizes ~8Gb, of which ~4Gb is Java heap
>            Reporter: Maxim Podkolzine
>            Priority: Critical
>             Fix For: 3.x
>
>         Attachments: memory-dump.png
>
>
> 2.8Gb of the heap is taken by the index data, pending for flush (see the screenshot). As a result the node fails with OOM.
> Questions:
> - Why can't Cassandra keep up with the inserted data and flush it?
> - What resources/configuration should be changed to improve the performance?



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