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From "Branimir Lambov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-12921) Parallel opening of sstables slows down startup
Date Thu, 17 Nov 2016 08:46:58 GMT
Branimir Lambov created CASSANDRA-12921:
-------------------------------------------

             Summary: 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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