Comments (6)
Hi @xuluna, you can add only one server at a time. Return code -7
means previous adding server operation is still in progress. Are you seeing this result in basic examples?
Also please make sure that when you add a server, that server should be online.
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@greensky00 Thank you so much for quick response! Yes I can guarantee the servers are all online. Then, in this case, how can I know when the previous request is done and I can add another server?
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@xuluna Since adding server is an asynchronous operation (as it will do data sync or snapshot transmission, may take long time), you need to do polling using below API:
NuRaft/include/libnuraft/raft_server.hxx
Line 355 in 9eddae8
If adding server is not done yet, it will return
nullptr
.
A naive example of waiting for adding server is done, in Benchmark tool:
NuRaft/tests/bench/raft_bench.cxx
Line 249 in 9eddae8
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@greensky00 Thanks! Sorry but I encountered another error:asio_service.cxx:operator():305: session 1 failed to read rpc header from socket 9.1.75.37:59884 due to error 2. This message is from a follower, there's no error message from the leader. I don't know why the port number is 59884. The leader's info is like this:
peer 1, DC ID 0, 9.1.75.37:9999, voting member, 1
peer 2, DC ID 0, 9.1.75.3:9999, voting member, 1
my id: 1, leader: 1, term: 1
Both ports should be 9999.
This error message also happens in examples (echo_server).
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Hi @xuluna,
If you meant below message in follower,
session 1 failed to read rpc header from socket 127.0.0.1:48174 due to error 2 [asio_service.cxx:305, operator()()]
please note that is normal and you can treat it as one-time false alarm. Whenever the sync-up with newly joining server is done, the leader closes previous channel (used for data sync) and then opens a new channel (for normal Raft protocol).
From follower's point of view, that error message shows up when the current connection is closed by leader.
If that message disrupts you, maybe we can provide a patch for workaround. Thanks.
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@greensky00 Thank you for your patient explanation! I'm fine with that message.
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Related Issues (20)
- Clean up CMakeLists HOT 2
- nuraft 2.0.0 cannot work on centos7 + centos8 HOT 2
- Preconditions of apply_pack HOT 1
- handle_append_entries_resp() declined append HOT 1
- How to use NuRaft with CMake's FetchContent? HOT 12
- CMake targets should be namespaced using ALIAS targets
- CMake targets are missing usage requirements
- Leadership yielding is not synchronized with replicated log HOT 1
- Should the type be uint8_t instead of size_t for serialize_v1p(...) in srv_state.hxx line 133 HOT 1
- This is a question, not an issue. About `state_machine::pre_commit` HOT 2
- Does nuraft support linearizable read if generating no raft log entry of read requests? HOT 2
- Out of order call to state_machine::create_snapshot() when manually triggering a snapshot HOT 4
- Found a MSan error in Asio HOT 4
- Data race in peer HOT 3
- auto_fwd_resp_handler should forward resp->get_result_code
- src/tracer.hxx:52 stack-buffer-overflow when using vsnprintf's return value
- cmd_result::get_result_str missing `SERVER_IS_LEAVING`
- The semantics of the nuraft::snapshot HOT 3
- Merge two clusters into one HOT 1
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