cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Bartłomiej Romański (JIRA) <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5371) Perform size-tiered compactions in L0 ("hybrid compaction")
Date Sat, 25 Jan 2014 11:47:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881824#comment-13881824
] 

Bartłomiej Romański commented on CASSANDRA-5371:
------------------------------------------------

Ravi, could you confirm that streaming puts all tables in L0? In that case I think we should
open a separate issue instead of commenting on a closed one.

> Perform size-tiered compactions in L0 ("hybrid compaction")
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-5371
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5371
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 2.0 beta 1
>
>         Attachments: HybridCompactionStrategy.java
>
>
> If LCS gets behind, read performance deteriorates as we have to check bloom filters on
man sstables in L0.  For wide rows, this can mean having to seek for each one since the BF
doesn't help us reject much.
> Performing size-tiered compaction in L0 will mitigate this until we can catch up on merging
it into higher levels.



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

Mime
View raw message