[jira] [Created] (CASSANDRA-20710) CEP-45: Ongoing truncation of reconciled portions of coordinator logs

["Aleksey Yeschenko (Jira)" <ji...@apache.org>]

Aleksey Yeschenko created CASSANDRA-20710:
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             Summary: CEP-45: Ongoing truncation of reconciled portions of coordinator logs
                 Key: CASSANDRA-20710
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20710
             Project: Apache Cassandra
          Issue Type: New Feature
            Reporter: Aleksey Yeschenko


As coordinator logs get reconciled by the peers, they should be truncated to free up space taken up by the journal and speed up lookups.

An equivalent of range tombstones needs to be implemented for the journal to encode ranges that are safe to drop. A simple supporting structure to keep track of per-log min and max ids needs to be implemented for efficient selection of segments to compact with the highest potential to free up space. And, lastly, a simple single-segment overwriting compaction needs to be implemented to implement this deletion.



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