nsivabalan commented on code in PR #5917:
URL: https://github.com/apache/hudi/pull/5917#discussion_r904268325
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hudi-timeline-service/src/main/java/org/apache/hudi/timeline/service/RequestHandler.java:
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@@ -138,14 +137,31 @@ private boolean isLocalViewBehind(Context ctx) {
String localTimelineHash = localTimeline.getTimelineHash();
// refresh if timeline hash mismatches and if local's last known instant <
client's last known instant (if config is enabled)
if (!localTimelineHash.equals(timelineHashFromClient)
- && (!timelineServiceConfig.refreshTimelineBasedOnLatestCommit ||
HoodieTimeline.compareTimestamps(localLastKnownInstant,
HoodieTimeline.LESSER_THAN, lastKnownInstantFromClient))) {
+ && (!timelineServiceConfig.refreshTimelineBasedOnLatestCommit
+ || localTimelineBehind(localTimeline, lastKnownInstantFromClient,
numInstantsFromClient))) {
return true;
}
// As a safety check, even if hash is same, ensure instant is present
return
!localTimeline.containsOrBeforeTimelineStarts(lastKnownInstantFromClient);
}
+ private static boolean localTimelineBehind(HoodieTimeline localTimeline,
String lastKnownInstantFromClient, String numInstantsFromClient) {
+ String localLastKnownInstant = localTimeline.lastInstant().isPresent() ?
localTimeline.lastInstant().get().getTimestamp()
+ : HoodieTimeline.INVALID_INSTANT_TS;
+ // Why comparing the num commits ?
+ // Assumes there are 4 commits on the timeline:
+ // timestamp(action): ts_0(commit), ts_1(commit), ts_2(clean), ts_3(commit)
+ // when ts_1 is in INFLIGHT state, ts_2 clean action is already finished,
+ // after ts_1 triggers #sync, the local timeline is refreshed as [ts_0,
ts_2],
+ // when ts_1 switches state from INFLIGHT to COMPLETED, no #sync triggers.
+ // at ts_3, when the fs view snapshot is requested, the ts_3 client
timeline should be [ts_0, ts_1, ts_2],
+ // if we only compare the latest commit, the local timeline is NOT behind,
but the fs view is not complete
+ // because ts_1 is lost.
+ return HoodieTimeline.compareTimestamps(localLastKnownInstant,
HoodieTimeline.LESSER_THAN, lastKnownInstantFromClient)
+ || localTimeline.countInstants() <
Integer.parseInt(numInstantsFromClient);
Review Comment:
should we check just "<" or "!=" to catch any mismatch ?
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