raft,tracker: track follower commit index #132
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When we send a snapshot, this is equivalent to sending all entries up to the snapshot's index. Correspondingly, we update the Next index to reflect this in-flight state. Signed-off-by: Pavel Kalinnikov <pavel@cockroachlabs.com>
This commit adds a Progress.pendingCommit field tracking the highest commit index <= Next-1 which the leader sent to the follower. It is used to distinguish cases when a commit index update needs or doesn't need to be sent to a follower. Signed-off-by: Pavel Kalinnikov <pavel@cockroachlabs.com>
Signed-off-by: Pavel Kalinnikov <pavel@cockroachlabs.com>
This commit closes a gap in commit index tracking. Previously, the leader did not precisely know what commit index the follower is at, and always had to send an empty MsgApp to brind it up to date if it's not. With this commit, followers now send the commit index of their logs back to the leader, and the leader tracks each follower's commit index. This will allow the leader (see other commits) to send an empty MsgApp with a commit index update only if the tracked index is behind, which will reduce the number of unnecessary messages in the system. Signed-off-by: Pavel Kalinnikov <pavel@cockroachlabs.com>
Signed-off-by: Pavel Kalinnikov <pavel@cockroachlabs.com>
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This PR closes a gap in commit index tracking, and reduces the number of unnecessary
MsgAppmessages in the system.Previously, the leader did not precisely know what commit index the follower is at, and always had to send an empty
MsgAppto bring it up to date if it's not.With this change, followers now send the commit index of their logs back to the leader, and the leader tracks each follower's commit index. This allows the leader to send an empty
MsgAppwith a commit index update only if the tracked index is behind.Resolves #131