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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3934) duplicative dfs_hosts entries handled wrong
Date Fri, 24 May 2013 03:34:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13665972#comment-13665972

Colin Patrick McCabe commented on HDFS-3934:

points 1, 2, 3, 4, 5, 6, 7, 9, 10, 12: thanks, will fix.

Point 8: {{MutableEntrySet}} is used internally in {{HostFileManager}}, but I don't want it
to escape to {{DatanodeManager}}.  I don't want {{DatanodeManager}] to be able to mutate this
set.  I was considering using an {{ImmutableMap}}, but unfortunately, {{ImmutableMap#Builder}}
chokes when you try to feed it two identical keys with different values.  There might be a
more elegant way of doing this, but for now, this seemed like a nice way to give DatanodeManager
a read-only view without doing a lot of copying.

Point 11: I see what you're getting at here, but it's a little trickier than it might seem.
 If I used {{Map#containsValue}}, I'd have to create a DatanodeInfo object which compared
equal to what I was looking for.  Then I have to start thinking about what fields {{DatanodeInfo#equals}}
looks at, which I kind of wanted to avoid.  It would work, but it feels kind of messy (I'd
be creating a temporary DatanodeID where a lot of the fields were set to dummy values because
{{DatanodeInfo#equals}} doesn't "care" about them, and I don't either.)  So I dunno.  Maybe
there is a better way to do, but it's not obvious to me.
> duplicative dfs_hosts entries handled wrong
> -------------------------------------------
>                 Key: HDFS-3934
>                 URL: https://issues.apache.org/jira/browse/HDFS-3934
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.1-alpha
>            Reporter: Andy Isaacson
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>         Attachments: HDFS-3934.001.patch, HDFS-3934.002.patch, HDFS-3934.003.patch, HDFS-3934.004.patch,
HDFS-3934.005.patch, HDFS-3934.006.patch, HDFS-3934.007.patch, HDFS-3934.008.patch, HDFS-3934.010.patch,
HDFS-3934.011.patch, HDFS-3934.012.patch, HDFS-3934.013.patch, HDFS-3934.014.patch
> A dead DN listed in dfs_hosts_allow.txt by IP and in dfs_hosts_exclude.txt by hostname
ends up being displayed twice in {{dfsnodelist.jsp?whatNodes=DEAD}} after the NN restarts
because {{getDatanodeListForReport}} does not handle such a "pseudo-duplicate" correctly:
> # the "Remove any nodes we know about from the map" loop no longer has the knowledge
to remove the spurious entries
> # the "The remaining nodes are ones that are referenced by the hosts files" loop does
not do hostname lookups, so does not know that the IP and hostname refer to the same host.
> Relatedly, such an IP-based dfs_hosts entry results in a cosmetic problem in the JSP
output:  The *Node* column shows ":50010" as the nodename, with HTML markup {{<a href="http://:50075/browseDirectory.jsp?namenodeInfoPort=50070&amp;dir=%2F&amp;nnaddr="

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