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From "Carl Yeksigian (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8301) Create a tool that given a bunch of sstables creates a "decent" sstable leveling
Date Thu, 19 Feb 2015 18:52:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14327944#comment-14327944
] 

Carl Yeksigian commented on CASSANDRA-8301:
-------------------------------------------

The args.length check should be for <2 since we want keyspace and cf. Also, should check
to make sure leveling at least one sstable, otherwise levels will be Int.MIN_VALUE.

Otherwise, +1.

> Create a tool that given a bunch of sstables creates a "decent" sstable leveling
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-8301
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8301
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>             Fix For: 2.0.13
>
>
> In old versions of cassandra (i.e. not trunk/3.0), when bootstrapping a new node, you
will end up with a ton of files in L0 and it might be extremely painful to get LCS to compact
into a new leveling
> We could probably exploit the fact that we have many non-overlapping sstables in L0,
and offline-bump those sstables into higher levels. It does not need to be perfect, just get
the majority of the data into L1+ without creating overlaps.
> So, suggestion is to create an offline tool that looks at the range each sstable covers
and tries to bump it as high as possible in the leveling.



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