[jira] [Comment Edited] (CASSANDRA-6688) Avoid possible sstable overlaps with leveled compaction

["Marcus Eriksson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13897959#comment-13897959 ] 

Marcus Eriksson edited comment on CASSANDRA-6688 at 2/11/14 4:02 PM:
---------------------------------------------------------------------

bq. This affects 1.2 as well right?
yeah, looks like it

Should we perhaps stop skipping levels? Can't really see it happening more than once in the lifetime of a cluster, right after bootstrap (or after dropping all the sstables to L0), first compaction might skip L1.


was (Author: krummas):
.bq This affects 1.2 as well right?
yeah, looks like it

Should we perhaps stop skipping levels? Can't really see it happening more than once in the lifetime of a cluster, right after bootstrap (or after dropping all the sstables to L0), first compaction might skip L1.

> Avoid possible sstable overlaps with leveled compaction
> -------------------------------------------------------
>
>                 Key: CASSANDRA-6688
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6688
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>         Attachments: 0001-6688.patch, 6688-v2.txt
>
>
> Two cases where we can end up with overlapping sstables in the leveled manifest;
> FIrst one is when we skip levels during compaction. Here we need to make sure we are not compacting in newLevel - 1 since if, for example, we are doing a L1 -> L2 compaction and then start a new L0 compaction where we decide to skip L1, we could have overlapping sstables in L2 when the compactions are done. This case is new in 2.0 since we check if we skip levels before the compaction starts.
> Second case is where we try to include as many overlapping L0 sstables as possible, here we could add sstables that are not compacting, but overlap sstables that are.



--
This message was sent by Atlassian JIRA
(v6.1.5#6160)