jackjlli commented on a change in pull request #7122:
URL: https://github.com/apache/incubator-pinot/pull/7122#discussion_r663539164
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File path:
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/PinotHelixResourceManager.java
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@@ -461,6 +462,34 @@ public synchronized PinotResourceManagerResponse
updateInstanceTags(String insta
return PinotResourceManagerResponse.SUCCESS;
}
+ /**
+ * Validates whether an instance is offline.
+ * Since ZNodes under "/LIVEINSTANCES" are ephemeral, if there is a ZK
session expire (e.g. due to network issue),
+ * the ZNode under "/LIVEINSTANCES" will be deleted. Thus, such race
condition can happen when this task is running.
+ * In order to double confirm the live status of an instance, the field
"LAST_OFFLINE_TIME" in ZNode under
+ * "/INSTANCES/<instance_id>/HISTORY" needs to be checked. If the value is
"-1", that means the instance is ONLINE;
+ * if the value is a timestamp, that means the instance starts to be OFFLINE
since that time.
+ * @param instanceId instance id
+ * @param offlineTimeRangeMs the time range that it's valid for an instance
to be offline
+ */
+ public boolean isInstanceOffline(String instanceId, long offlineTimeRangeMs)
{
+ // Check if the instance is included in /LIVEINSTANCES
+ if (_helixDataAccessor.getProperty(_keyBuilder.liveInstance(instanceId))
!= null) {
+ return false;
+ }
+ ParticipantHistory participantHistory =
_helixDataAccessor.getProperty(_keyBuilder.participantHistory(instanceId));
+ long lastOfflineTime = participantHistory.getLastOfflineTime();
+ if (lastOfflineTime == -1) {
Review comment:
This is set up from Helix. From Helix source code, the returned value
should be either `-1` or a regular timestamp:
https://github.com/apache/helix/blob/386a77d566f1dc0b480c3bcbdb4a2880a8b8a4a9/helix-core/src/main/java/org/apache/helix/model/ParticipantHistory.java
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