Sylvain Lebresne created CASSANDRA-4932:
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Summary: Agree on a gcbefore/expirebefore value for all replica
during validation compaction
Key: CASSANDRA-4932
URL: https://issues.apache.org/jira/browse/CASSANDRA-4932
Project: Cassandra
Issue Type: Improvement
Reporter: Sylvain Lebresne
Priority: Minor
Fix For: 1.3
CASSANDRA-4905 made it so that we don't include gcable tombstones in merkle
tree digests because otherwise the fact that a gcable tombstone exists in a
given node depends on the local scheduling of compactions, which make the
merkle-tree digets depends on that which is bad.
However, we still depends on a value of gcbefore/expirebefore that is computed
locally on the node. This is not a huge deal because each node should compute
those value roughly at the same time so the discrepancies shouldn't exceed a
few hundreds of milliseconds in general and a few seconds if we're unlucky.
Still, it's fairly easy to fix this problem by having the repair coordinator
pick the gcbefore/expirebefore and share that with all the replica. It does
require sending that info on the wire though, so will require a new messaging
version and thus can only be done in a major cycle.
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