[jira] [Work logged] (HADOOP-18056) DistCp: Filter duplicates in the source paths

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-18056?focusedWorklogId=702853&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-702853 ]

ASF GitHub Bot logged work on HADOOP-18056:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/Jan/22 06:28
            Start Date: 03/Jan/22 06:28
    Worklog Time Spent: 10m 
      Work Description: ayushtkn commented on a change in pull request #3825:
URL: https://github.com/apache/hadoop/pull/3825#discussion_r777308040



##########
File path: hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptions.java
##########
@@ -234,7 +236,18 @@ public Path getSourceFileListing() {
 
   public List<Path> getSourcePaths() {
     return sourcePaths == null ?
-        null : Collections.unmodifiableList(sourcePaths);
+        null :
+        Collections.unmodifiableList(getUniquePaths(sourcePaths));
+  }
+
+  private List<Path> getUniquePaths(List<Path> srcPaths) {
+    Set<Path> uniquePaths = new LinkedHashSet<>();
+    for (Path path : srcPaths) {
+      if (!uniquePaths.add(path)) {
+        LOG.warn("Path: {} added multiple times, Ignoring the redundant entry.", path);

Review comment:
       Thanx @tomscut, I have changed it.




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

    Worklog Id:     (was: 702853)
    Time Spent: 1h 10m  (was: 1h)

> DistCp: Filter duplicates in the source paths
> ---------------------------------------------
>
>                 Key: HADOOP-18056
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18056
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Ayush Saxena
>            Assignee: Ayush Saxena
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Add a basic filtering to remove the exact duplicate paths exposed for copying.
> In case two same srcPath say /tmp/file1 is passed in the list twice. DistCp fails with DuplicateFileException, post building the listing.
> Would be better if we do a basic filtering of duplicate paths. 



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