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From "Dave Brosius (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-5537) Reduce Empty Map allocations in Directory.SSTableLister
Date Mon, 06 May 2013 06:12:16 GMT
Dave Brosius created CASSANDRA-5537:

             Summary: Reduce Empty Map allocations in Directory.SSTableLister
                 Key: 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:

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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