Dave Brosius created CASSANDRA-5537:
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Summary: Reduce Empty Map allocations in Directory.SSTableLister
Key: CASSANDRA-5537
URL: https://issues.apache.org/jira/browse/CASSANDRA-5537
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 2.0
Reporter: Dave Brosius
Priority: Trivial
Fix For: 2.0
Attachments: 5537.txt
SSTableLister allocates HashMaps consistently that are very often not used.
See output: http://pastebin.com/Ky4hUn5X
Format is
Type Date SourceLine CollectionSize NumBuckets NumBucketsUsed
The snapshot is taken after the size of the collection hasn't changed for 5
seconds.
Postpone creation of hashmap until you need it.
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