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Benedict commented on CASSANDRA-7066: ------------------------------------- bq. We could be partway done renaming .tmp to live Ah, because we could have multiple target sstables. Yes, sticky. I still think performing some cleanup is a good thing, else we can end up with unnecessary data, but I don't think the current setup is actually much better than dropping the tracking entirely. So long as any failure is transient (not a bug that occurs predictably) it should be a relatively minor concern. So let's go with that. > Simplify (and unify) cleanup of compaction leftovers > ---------------------------------------------------- > > Key: CASSANDRA-7066 > URL: https://issues.apache.org/jira/browse/CASSANDRA-7066 > Project: Cassandra > Issue Type: Improvement > Components: Core > Reporter: Benedict > Priority: Minor > Fix For: 3.0 > > > Currently we manage a list of in-progress compactions in a system table, > which we use to cleanup incomplete compactions when we're done. The problem > with this is that 1) it's a bit clunky (and leaves us in positions where we > can unnecessarily cleanup completed files, or conversely not cleanup files > that have been superceded); and 2) it's only used for a regular compaction - > no other compaction types are guarded in the same way, so can result in > duplication if we fail before deleting the replacements. > I'd like to see each sstable store in its metadata its direct ancestors, and > on startup we simply delete any sstables that occur in the union of all > ancestor sets. This way as soon as we finish writing we're capable of > cleaning up any leftovers, so we never get duplication. It's also much easier > to reason about. -- This message was sent by Atlassian JIRA (v6.2#6252)