[GitHub] [ozone] umamaheswararao commented on a diff in pull request #3453: HDDS-6795: EC: PipelineStateMap#addPipeline should not have precondition checks post db updates

[GitBox <gi...@apache.org>]

umamaheswararao commented on code in PR #3453:
URL: https://github.com/apache/ozone/pull/3453#discussion_r888259420


##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/placement/algorithms/SCMContainerPlacementRackScatter.java:
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@@ -227,6 +227,16 @@ public List<DatanodeDetails> chooseDatanodes(
           placementStatus.expectedPlacementCount();
       throw new SCMException(errorMsg, null);
     }
+    if (nodesRequiredToChoose != chosenNodes.size()) {
+      String reason = "Chosen nodes size: " + chosenNodes
+          .size() + ", but required nodes to choose: " + nodesRequiredToChoose
+          + " do not match.";
+      LOG.warn("Placement policy could not choose the enough nodes."
+              + " {} Available nodes count: {}, Excluded nodes count: {}",
+          reason, totalNodesCount, excludedNodesCount);
+      throw new SCMException(reason,
+          SCMException.ResultCodes.FAILED_TO_FIND_HEALTHY_NODES);
+    }

Review Comment:
   I assumed that is more validating the placement with respective to racks. Some how we are still seeing the issue of getting less nodes than requested.



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