prashantpogde commented on code in PR #4490:
URL: https://github.com/apache/ozone/pull/4490#discussion_r1164580042
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hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/snapshot/SnapshotDiffManager.java:
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@@ -167,8 +158,19 @@ public SnapshotDiffManager(ManagedRocksDB db,
new ThreadPoolExecutor.CallerRunsPolicy()
);
- // TODO: [SNAPSHOT] Load jobs only if it is leader node.
- // It could a event-triggered form OM when node is leader and up.
+ // Ideally, loadJobsOnStartUp should run only on OM node, since SnapDiff
+ // is not HA currently and running this on all the nodes would be
+ // inefficient. Especially, when OM node restarts and loses its leadership.
+ // However, it is hard to determine if node is leader node because
consensus
+ // happens inside Ratis. We can add something like Awaitility.wait() here
+ // but that is not full proof either.
+ // Hence, we decided that it is OK to let this run on all the OM nodes for
+ // now knowing that it would be inefficient.
+ // When SnapshotDiffManager loads for very first time, loadJobsOnStartUp
+ // will be no-ops for all the nodes. In subsequent restarts or upgrades,
+ // it would run on the current leader and most like on previous leader
only.
+ // When we build snapDiff HA aware, we will revisit this.
+ // Details:
https://github.com/apache/ozone/pull/4438#discussion_r1149788226
this.loadJobsOnStartUp();
Review Comment:
shouldn't this be running on every restart ?
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