Avoid large array allocation for compressed chunk offsets
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Key: CASSANDRA-3432
URL: https://issues.apache.org/jira/browse/CASSANDRA-3432
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 1.0.0
Reporter: Sylvain Lebresne
Assignee: Sylvain Lebresne
Priority: Minor
Fix For: 1.0.2
For each compressed file we keep the chunk offsets in memory (a long[]). The
size of this array is directly proportional to the sstable file and the
chunk_length_kb used, but say for a 64GB sstable, we're talking ~8MB in memory
by default.
Without being absolutely huge, this probably makes the life of the GC harder
than necessary for the same reasons than CASSANDRA-2466, and this ticket
proposes the same solution, i.e. to break down those big array into smaller
ones to ease fragmentation.
Note that this is only a concern for size tiered compaction. But until leveled
compaction is battle tested, the default and we know nobody uses size tiered
anymore, it's probably worth making the optimization.
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