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https://issues.apache.org/jira/browse/HDFS-15099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17012611#comment-17012611
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Konstantin Shvachko commented on HDFS-15099:
--------------------------------------------
This looks great, Chen, thanks. Minor things:
# We can rename {{isWrappedStandbyException()}} to
{{shouldFailoverOnException()}} and implement it as
{code}
private static boolean isWrappedStandbyException(Exception e) {
if (!(e instanceof RemoteException)) {
return false;
}
Exception unwrapped = ((RemoteException)e).unwrapRemoteException(
ObserverRetryOnActiveException.class,
StandbyException.class);
return unwrapped instanceof ObserverRetryOnActiveException ||
unwrapped instanceof StandbyException;
}
{code}
Then you don't need to duplicate code for OROAE.
# Would be good to add a direct test for redirecting to active on aTime update.
Like this:
{code}
@@ -74,15 +76,31 @@
private static DistributedFileSystem dfs;
private final Path testPath= new Path("/TestObserverNode");
+ private final static long SMALL_ACCESSTIME_PRECISION = 200;
@BeforeClass
public static void startUpCluster() throws Exception {
conf = new Configuration();
conf.setBoolean(DFS_NAMENODE_STATE_CONTEXT_ENABLED_KEY, true);
+ conf.setLong(DFS_NAMENODE_ACCESSTIME_PRECISION_KEY,
+ SMALL_ACCESSTIME_PRECISION);
qjmhaCluster = HATestUtil.setUpObserverCluster(conf, 1, 0, true);
dfsCluster = qjmhaCluster.getDfsCluster();
}
+ @Test
+ public void testAccessTimeUpdateRedirectToActive() throws Exception {
+ dfs.create(testPath, (short)1).close();
+ assertSentTo(0);
+ dfs.open(testPath).close();
+ assertSentTo(2);
+
+ // Verify that aTime update redirects on Active
+ Thread.sleep(SMALL_ACCESSTIME_PRECISION + 1);
+ dfs.open(testPath).close();
+ assertSentTo(0);
+ }
+
{code}
# Calling {{setObserverRead(true)}} in the beginning of the test is redundant,
it is already called by {{setUp()}}.
> [SBN Read] getBlockLocations() should throw ObserverRetryOnActiveException on
> an attempt to change aTime on ObserverNode
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-15099
> URL: https://issues.apache.org/jira/browse/HDFS-15099
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.10.0
> Reporter: Konstantin Shvachko
> Assignee: Chen Liang
> Priority: Major
> Attachments: HDFS-15099-branch-2.10.001.patch
>
>
> The precision of updating an INode's aTime while executing
> {{getBlockLocations()}} is 1 hour by default. Updates cannot be handled by
> ObserverNode, so the call should be redirected to Active NameNode. In order
> to redirect to active the ObserverNode should through
> {{ObserverRetryOnActiveException}}.
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