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https://issues.apache.org/jira/browse/HDFS-16373?focusedWorklogId=691655&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-691655
 ]

ASF GitHub Bot logged work on HDFS-16373:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 07/Dec/21 11:24
            Start Date: 07/Dec/21 11:24
    Worklog Time Spent: 10m 
      Work Description: ayushtkn commented on a change in pull request #3756:
URL: https://github.com/apache/hadoop/pull/3756#discussion_r763896675



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java
##########
@@ -2775,14 +2775,23 @@ public void waitActive(int nnIndex) throws IOException {
     DFSClient client = new DFSClient(addr, conf);
 
     // ensure all datanodes have registered and sent heartbeat to the namenode
-    while (shouldWait(client.datanodeReport(DatanodeReportType.LIVE), addr)) {
-      try {
+    int failedCount = 0;
+    try {
+      while (shouldWait(client.datanodeReport(DatanodeReportType.LIVE), addr)) 
{
         LOG.info("Waiting for cluster to become active");
         Thread.sleep(100);
-      } catch (InterruptedException e) {
       }
+    } catch (IOException e) {
+      failedCount++;
+      // Cached RPC connection to namenode, if any, is expected to fail once
+      if (failedCount > 1) {

Review comment:
       the while looped pulled in should solve, else I need to spend some time 
during this weekend. 
   my Holidays ends today. :-) 




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 691655)
    Time Spent: 1h 10m  (was: 1h)

> Fix MiniDFSCluster restart in case of multiple namenodes
> --------------------------------------------------------
>
>                 Key: HDFS-16373
>                 URL: https://issues.apache.org/jira/browse/HDFS-16373
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Ayush Saxena
>            Assignee: Ayush Saxena
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> In case of multiple namenodes, if more than one namenode are restarted, it 
> fails. Since the restartNamenode checks for all the namenodes to get up, But 
> if 2 namenodes are down, and we restart one, the other namenode won't be up, 
> so restart fails.



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