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From "Ayush Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14249) RBF: Tooling to identify the subcluster location of a file
Date Fri, 15 Feb 2019 21:56:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16769781#comment-16769781
] 

Ayush Saxena commented on HDFS-14249:
-------------------------------------

Thanx [~elgoiri] for taking this up. Seems good to have such an API.

Some comments :
 * Please Add the newly added command in the documentation.
 * A comment here explaining the reason for the same should be good.The scenario which this
seems to be handling.

{code:java}
+    } catch (Exception e) {
+      LOG.error("Cannot get create location for {}", src);
+      List<RemoteLocation> locs =
+          this.router.getRpcServer().getLocationsForPath(src, false);
+      if (locs != null && !locs.isEmpty()) {
+        loc = locs.get(0);
+      }
{code}
Barring file.txt (The first in the test) all lands in the exception area only.
 * A minor doubt, Will this work for directories too? I feel this should. If it is intended
too then rather than sending the only one we should send all destinations and if it is not
intended to work for directory we should add a check for the same to avoid giving back single
result for the same, if that seems to be not there. If am not missing something.

> RBF: Tooling to identify the subcluster location of a file
> ----------------------------------------------------------
>
>                 Key: HDFS-14249
>                 URL: https://issues.apache.org/jira/browse/HDFS-14249
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Major
>         Attachments: HDFS-14249-HDFS-13891.000.patch, HDFS-14249-HDFS-13891.001.patch
>
>
> Mount points can spread files across multiple subclusters depennding on a policy (e.g.,
HASH, HASH_ALL). Administrators would need a way to identify the location.



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