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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (CASSANDRA-12921) Parallel opening of sstables slows down startup
Date Tue, 07 Mar 2017 17:45:38 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joshua McKenzie reassigned CASSANDRA-12921:
-------------------------------------------

    Assignee: Chris Lohfink

> Parallel opening of sstables slows down startup
> -----------------------------------------------
>
>                 Key: CASSANDRA-12921
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12921
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Branimir Lambov
>            Assignee: Chris Lohfink
>            Priority: Minor
>
> [{{SSTableReader.openAll}}|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java#L545],
used by initial startup, spawns multiple threads to open sstables.
> This is a bad idea as the longest step in the opening process is the loading of bloom
filters and when this is done in parallel the drives have to do a lot of unnecessary seeking.



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