RATIS-2242 change consistency criteria of heartbeat during appendLog #1215
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szetszwo
reviewed
Jan 21, 2025
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@SzyWilliam , thanks for finding out the problem and working on this! Please see the comment inlined.
| @@ -1717,7 +1717,7 @@ private long checkInconsistentAppendEntries(TermIndex previous, List<LogEntryPro | |||
| } | |||
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| // Check if "previous" is contained in current state. | |||
| if (previous != null && !state.containsTermIndex(previous)) { | |||
| if (previous != null && !state.containsTermIndex(previous) && appendLogFuture.get().isDone()) { | |||
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This will disable inconsistent check when the server is busy (appendLogFuture.get().isDone() will mostly false). We need to remember the entries being appended to the log; see https://issues.apache.org/jira/secure/attachment/13074189/1215_review.patch
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@szetszwo Thanks very much for the patch! I’m really impressed by how clean and intuitive the design of remembering the entries. It's always exciting to enjoy the art of programming. |
szetszwo
approved these changes
Jan 26, 2025
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What changes were proposed in this pull request?
When enable both appendLog channel and heartbeat channel,
Leader:
appendLog will send an AppendEntries RPC with (previous = nextIndex0, entries = [e1,e2...]), then update the follower nextIndex to nextIndex1
Subsequent heartbeat channel will send AppendEntries RPCs with (previous = nextIndex1, entries = empty)
Follower:
Inconsistency reply will be triggered when handling the heartbeats by
https://github.com/apache/ratis/blob/8353a017fe6545fbfb74960ecb3a0f4396c478d2/ratis-server/src/main/java/org/apache/ratis/server/impl/RaftServerImpl.java#L1720-1724
What is the link to the Apache JIRA
https://issues.apache.org/jira/projects/RATIS/issues/RATIS-2242?filter=allissues
How was this patch tested?
Unit tests