Oleg Anastasyev created CASSANDRA-6077:
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Summary: SSTableMetadata.min(max)ColumnNames keep whole
SlabAllocatior region referenced; wasting memory
Key: CASSANDRA-6077
URL: https://issues.apache.org/jira/browse/CASSANDRA-6077
Project: Cassandra
Issue Type: Bug
Reporter: Oleg Anastasyev
.. which could be a problem when there is a lot of sstables, when using LCS for
example.
SSTableWriter calls SSTableMetadata.Collector.updateMin(Max)ColumnNames passing
List of ByteByffers which reference a small byte array in slab region.
ColumnNameHelper.mergeMin(Max) just returns a reference of column name back to
SSTableMetadata. So the latter keeps whole slab region referenced, preventing
it from being GCed.
Fixed it by making copies of column name bytebuffer, if its size more than
column name itself.
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