[jira] [Updated] (CASSANDRA-5371) Perform size-tiered compactions in L0

["T Jake Luciani (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-5371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

T Jake Luciani updated CASSANDRA-5371:
--------------------------------------

    Attachment: HybridCompactionStrategy.java

This initial version puts the newly flushed memtables into a queue and when there are 4 it size tiers them.  So you get 1/4 the sstables in L0.
                
> Perform size-tiered compactions in L0
> -------------------------------------
>
>                 Key: CASSANDRA-5371
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5371
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: T Jake Luciani
>             Fix For: 2.0
>
>         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.

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