[jira] [Commented] (CASSANDRA-12921) Parallel opening of sstables slows down startup

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15674682#comment-15674682 ] 

Jonathan Ellis commented on CASSANDRA-12921:
--------------------------------------------

IMO we should be optimizing for SSD now, not HDD.

> 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
>            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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