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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3507) DFS#isInSafeMode needs to execute only on Active NameNode
Date Mon, 29 Oct 2012 23:52:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486516#comment-13486516
] 

Aaron T. Myers commented on HDFS-3507:
--------------------------------------

The latest patch looks pretty good to me. We can address the larger points about setting the
service's vs just a single NN's safemode value, and changing the ClientProtocol to have an
actual isInSafeMode/getSafeMode operation in separate JIRA(s).

One comment on the patch:

I don't think this will actually affect the correctness of the patch, but this code makes
me a little wary, since as we've discussed a setSafeMode operation is not in fact necessarily
a write:
{code}
+    OperationCategory opCategory = OperationCategory.UNCHECKED;
+    if (isChecked) {
+      opCategory = OperationCategory.WRITE;
+    }
{code}
I think better would be something like this:
{code}
+    OperationCategory opCategory = OperationCategory.UNCHECKED;
+    if (isChecked) {
+      if (action == SafeModeAction.SAFEMODE_GET) {
+        opCategory = OperationCategory.READ;
+      } else {
+        opCategory = OperationCategory.WRITE
+      }
+    }
{code}
This should be in line with the behavior that an eventual split of setSafeMode/getSafeMode
operations would implement.

How does that sound?
                
> DFS#isInSafeMode needs to execute only on Active NameNode
> ---------------------------------------------------------
>
>                 Key: HDFS-3507
>                 URL: https://issues.apache.org/jira/browse/HDFS-3507
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Vinay
>            Assignee: Vinay
>            Priority: Critical
>         Attachments: HDFS-3507.patch, HDFS-3507.patch
>
>
> Currently DFS#isInSafeMode is not Checking for the NN state. It can be executed on any
of the NNs.
> But HBase will use this API to check for the NN safemode before starting up its service.
> If first NN configured is in standby then DFS#isInSafeMode will check standby NNs safemode
but hbase want state of Active NN.

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