Github user huor commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/291#discussion_r50649995
--- Diff: src/backend/resourcemanager/resourcepool.c ---
@@ -893,6 +893,28 @@ int addHAWQSegWithSegStat(SegStat segstat, bool
*capstatchanged)
else {
segresource = getSegResource(segid);
Assert(segresource != NULL);
+ uint8_t oldStatus = segresource->Stat->FTSAvailable;
+ bool statusChanged = oldStatus != segstat->FTSAvailable;
+
+ /* Check if RM process is restarted in this segment */
+ if (segresource->Stat->RMStartTimestamp !=
segstat->RMStartTimestamp)
--- End diff --
A comment here to illustrate the idea would be better. It is also good to
mention the risk that below three condition hold:
1. rmseg reset
2. system time reset on segment node
3. segresource->Stat->RMStartTimestamp == segstat->RMStartTimestamp
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