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Transactions T120803 Change Details

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Cassandra 2.1.12 brings several [welcome improvements](https://github.com/apache/cassandra/blob/cassandra-2.1/CHANGES.txt) especially related to DTCS: * Limit window size in DTCS (CASSANDRA-10280) * Do STCS in DTCS windows (CASSANDRA-10276) Together, these two changes will likely reduce the compaction load significantly, which in turn reduces latency & lets us push density further.

Cassandra 2.1.12 brings several [welcome improvements](https://github.com/apache/cassandra/blob/cassandra-2.1/CHANGES.txt) especially related to DTCS: * Limit window size in DTCS (CASSANDRA-10280) * Do STCS in DTCS windows (CASSANDRA-10276) Together, these two changes will likely reduce the compaction load significantly, which in turn reduces latency & lets us push density further.

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