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Posted to commits@cassandra.apache.org by "Michael Semb Wever (Jira)" <ji...@apache.org> on 2020/08/24 09:48:00 UTC
[jira] [Commented] (CASSANDRA-16071)
max_compaction_flush_memory_in_mb is interpreted as bytes
[ https://issues.apache.org/jira/browse/CASSANDRA-16071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17183111#comment-17183111 ]
Michael Semb Wever commented on CASSANDRA-16071:
------------------------------------------------
Patches
- [3.11|https://github.com/apache/cassandra/compare/trunk...thelastpickle:mck/cassandra-3.11_max_compaction_flush_memory_in_mb_fix]
- [trunk|https://github.com/apache/cassandra/compare/trunk...thelastpickle:mck/trunk_max_compaction_flush_memory_in_mb_fix]
(will update with CI later today…)
> 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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