Make ReadIndex work safely#2469
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Jul 19, 2019
Fix a long-standing bug, where we were overwriting raftpb.Message.Context, before sending it over the wire. The understanding we had was that Context field was unused by raft library, but that was not the case. Specifically, MsgReadIndex was being sent as part of HeartBeat using the Context field. Changed the proto that we use for sending Raft message batches, so that it carries RaftContext directly, instead of making it part of the raftpb.Message. Turned linearizable reads back on for Zero, and for retrieving state from Zero. More context here: etcd-io/etcd#9893
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Fix a long-standing bug, where we were overwriting
raftpb.Message.Context, before sending it over the wire. The understanding we had was that Context field was unused by raft library, but that was not the case. Specifically, MsgReadIndex was being sent as part of HeartBeat using the Context field.Changed the proto that we use for sending Raft message batches, so that it carries RaftContext directly, instead of making it part of the raftpb.Message.
Turned linearizable reads back on for Zero, and for retrieving state from Zero.
More context here: etcd-io/etcd#9893
This change is