Ben Johnson de698aa03e consensus block merge ... This commit refactors the anti-entropy system to fetch data from all replicated blocks and only set/clear bits which deviate from the consensus between all blocks. An example of this is if 3 nodes had the following bits set for a single bitmap: Node A: 1 2 3 Node B: 2 4 Node C: 1 2 4 Then only bits which are set on a majority will be set. In this case bits 1, 2, & 4 are set but 3 only exists on a single node. The node performing the merge would then determine the following set/clear diffs for each node: Node A: clear(3), set(4) Node B: set(1) Node C: none Once the merge is performed and all nodes receive their diff instructions then the nodes will be in sync: Node A: 1 2 4 Node B: 1 2 4 Node C: 1 2 4 There still exists situations where bits can be reset. If Node A is up and Node B & C are down then Node A's bits will be reset once B & C come back online. We should add write consistency settings for incoming writes so that we can ensure that a quorum is written to before returning a success. This is outside the scope of this commit though.		2016-05-06 16:19:10 -06:00
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pilosa	consensus block merge	2016-05-06 16:19:10 -06:00
pilosactl	consensus block merge	2016-05-06 16:19:10 -06:00