SzyWilliam commented on code in PR #996:
URL:
https://github.com/apache/incubator-celeborn/pull/996#discussion_r1030087597
##########
master/src/main/java/org/apache/celeborn/service/deploy/master/clustermeta/ha/StateMachine.java:
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@@ -344,6 +344,7 @@ public long takeSnapshot() {
LOG.warn("Failed to rename snapshot from {} to {}.", tempFile,
snapshotFile);
return RaftLog.INVALID_LOG_INDEX;
}
+ storage.loadLatestSnapshot();
Review Comment:
`StateMachine`'s `getLatestSnapshot` is called every turn when `LogAppender`
sends `AppendEntries`, see
https://github.com/apache/ratis/blob/729d3dce220f352a720cbe38d0762399b6e55f06/ratis-grpc/src/main/java/org/apache/ratis/grpc/server/GrpcLogAppender.java#L154.
`loadSnapshot` is a heavy operation, since it will scan the file system and
uses regular expressions. If we move this method to `getLatestSnapshot`, it
maybe a performance problem. What do you think?
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