[jira] [Updated] (CASSANDRA-16071) max_compaction_flush_memory_in_mb is interpreted as bytes

["Michael Semb Wever (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-16071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Semb Wever updated CASSANDRA-16071:
-------------------------------------------
     Bug Category: Parent values: Correctness(12982)Level 1 values: API / Semantic Implementation(12988)
       Complexity: Low Hanging Fruit
    Discovered By: User Report
    Fix Version/s: 4.0-beta
                   3.11.x
         Severity: Normal
           Status: Open  (was: Triage Needed)

> max_compaction_flush_memory_in_mb is interpreted as bytes
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-16071
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16071
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Feature/SASI
>            Reporter: Michael Semb Wever
>            Assignee: Michael Semb Wever
>            Priority: Normal
>             Fix For: 3.11.x, 4.0-beta
>
>
> In CASSANDRA-12662 [~scottcarey] [reported|https://issues.apache.org/jira/browse/CASSANDRA-12662?focusedCommentId=17070055&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17070055] that the {{max_compaction_flush_memory_in_mb}} setting gets incorrectly interpreted in bytes rather than megabytes as its name implies.
> {quote}
> 1.  the setting 'max_compaction_flush_memory_in_mb' is a misnomer, it is actually memory in BYTES.  If you take it at face value, and set it to say, '512' thinking that means 512MB,  you will produce a million temp files rather quickly in a large compaction, which will exhaust even large values of max_map_count rapidly, and get the OOM: Map Error issue above and possibly have a very difficult situation to get a cluster back into a place where nodes aren't crashing while initilaizing or soon after.  This issue is minor if you know about it in advance and set the value IN BYTES.
> {quote}



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