CODEWITHSUNDEEP
cassandracassandra-2.0datastaxnodetool
piotrwest
piotrwest

Reputation: 2166

What does "nodetool compact" do for DateTieredCompactionStrategy?

The documentation for nodetool compact says:

This command starts the compaction process on tables that use the SizeTieredCompactionStrategy and DateTieredCompactionStrategy. You can specify a keyspace for compaction.

But what it does for DateTieredCompactionStrategy?

Side question: what is -s, --split-output parameter? It is explained as: Use -s to not create a single big file. I'm confused - isn't that the purpose of nodetool compact?

Upvotes: 7

Views: 2269

Answers (1)

phact
phact

Reputation: 7305

Nodetool compact with no flags will still create a big single file even with DTCS.

The -s, --split-output option is only there starting with c* 2.2 and beyond.

The news.txt states:

 +     It is also possible to split output when doing a major compaction with
 +     STCS - files will be split in sizes 50%, 25%, 12.5% etc of the total size.
 +     This might be a bit better than old major compactions which created one big
 +     file on disk.

On DTCS -s won't do anything special (will still create one large sstable)

Upvotes: 5

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