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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-11412) Many sstablescanners opened during repair
Date Wed, 23 Mar 2016 08:23:25 GMT
Marcus Eriksson created CASSANDRA-11412:
-------------------------------------------

             Summary: Many sstablescanners opened during repair
                 Key: CASSANDRA-11412
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11412
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Marcus Eriksson


Since CASSANDRA-5220 we open [one sstablescanner per range per sstable|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/db/compaction/CompactionStrategyManager.java#L374].
If compaction gets behind and you are running vnodes with 256 tokens and RF3, this could become
a problem (ie, {{768 * number of sstables}} scanners)

We could probably refactor this similar to the way we handle scanners with LCS - only open
the scanner once we need it



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