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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-14011) Multi threaded L0 -> L1 compaction
Date Mon, 13 Nov 2017 15:34:01 GMT
Marcus Eriksson created CASSANDRA-14011:
-------------------------------------------

             Summary: Multi threaded L0 -> L1 compaction
                 Key: CASSANDRA-14011
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14011
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Marcus Eriksson
             Fix For: 4.x


Currently L0 -> L1 compactions are almost always single threaded because every L0 sstable
will overlap with all L1 sstables. To improve this, we should range-split the input sstables
in a configurable amount of parts and then use multiple threads to write out the results.
This is similar to the {{max_subcompactions}} option in RocksDB: https://github.com/facebook/rocksdb/wiki/Leveled-Compaction



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