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43ea1f5945
Lets operations working on all shards "join" and acquire the same value of something, with that value being based on whenever all shards reach the join. Obvious use case: time stamp after one set of per-shard ops, but before final ones. The generation of the value is guaranteed to happen on the shards that created the join point. Based on the join-ops in CF::snapshot, but abstracted and made caller responsibility. Primary use case is to help deal with the join-problem of truncation. Message-Id: <1456332856-23395-1-git-send-email-calle@scylladb.com>