[
https://issues.apache.org/jira/browse/CASSANDRA-4341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295202#comment-13295202
]
Jonathan Ellis commented on CASSANDRA-4341:
-------------------------------------------
bq. Bringing the small files from L0 to L1 magnifies the issue
Meaning, they are so small that even after L0 compaction, what gets promoted to
L1 is also "small?"
> Small SSTable Segments Can Hurt Leveling Process
> ------------------------------------------------
>
> Key: CASSANDRA-4341
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4341
> Project: Cassandra
> Issue Type: Bug
> Reporter: Benjamin Coverston
>
> This concerns:
> static int MAX_COMPACTING_L0 = 32;
> Repair can create very small SSTable segments. We should consider moving to a
> threshold that takes into account the size of the files brought into
> compaction rather than the number of files for this and similar situations.
> Bringing the small files from L0 to L1 magnifies the issue.
> If there are too many very small files in L0 perhaps even an intermediate
> compaction would even reduce the magnifying effect of a L0 to L1 compaction.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
