danny0405 commented on code in PR #4739:
URL: https://github.com/apache/hudi/pull/4739#discussion_r866499815


##########
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/client/BaseHoodieWriteClient.java:
##########
@@ -1301,4 +1359,33 @@ public void close() {
     this.heartbeatClient.stop();
     this.txnManager.close();
   }
+
+  private void setWriteTimer(HoodieTable<T, I, K, O> table) {
+    String commitType = table.getMetaClient().getCommitActionType();
+    if (commitType.equals(HoodieTimeline.COMMIT_ACTION)) {
+      writeTimer = metrics.getCommitCtx();
+    } else if (commitType.equals(HoodieTimeline.DELTA_COMMIT_ACTION)) {
+      writeTimer = metrics.getDeltaCommitCtx();
+    }
+  }
+
+  private void tryUpgrade(HoodieTableMetaClient metaClient, Option<String> 
instantTime) {
+    UpgradeDowngrade upgradeDowngrade =
+        new UpgradeDowngrade(metaClient, config, context, 
upgradeDowngradeHelper);
+
+    if 
(upgradeDowngrade.needsUpgradeOrDowngrade(HoodieTableVersion.current())) {
+      // Ensure no inflight commits by setting EAGER policy and explicitly 
cleaning all failed commits
+      List<String> instantsToRollback = getInstantsToRollback(metaClient, 
HoodieFailedWritesCleaningPolicy.EAGER, instantTime);
+
+      Map<String, Option<HoodiePendingRollbackInfo>> pendingRollbacks = 
getPendingRollbackInfos(metaClient);

Review Comment:
   > sure table is in a consistent state (no leftovers of failed commits) when 
we start the upgrade process.
   
   My confusion is why we need to do that for upgrade ? 
   Is there any restriction here for correctness ? The code before the patch 
does not do so.
   



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