[ 
https://issues.apache.org/jira/browse/HDFS-16911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17703751#comment-17703751
 ] 

ASF GitHub Bot commented on HDFS-16911:
---------------------------------------

sadanand48 commented on code in PR #5364:
URL: https://github.com/apache/hadoop/pull/5364#discussion_r1145254640


##########
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpSync.java:
##########
@@ -161,20 +161,32 @@ private void checkFilesystemSupport(Path sourceDir, Path 
targetDir,
     if (!srcFs.hasPathCapability(sourceDir,
         CommonPathCapabilities.FS_SNAPSHOTS)) {
       throw new IllegalArgumentException(
-          "The source file system " + srcFs.getScheme() + " does not support 
snapshot.");
+          "The source file system " + srcFs.getScheme()
+              + " does not support snapshot.");
     }
     if (!tgtFs.hasPathCapability(targetDir,
         CommonPathCapabilities.FS_SNAPSHOTS)) {
       throw new IllegalArgumentException(
-          "The target file system " + tgtFs.getScheme() + " does not support 
snapshot.");
+          "The target file system " + tgtFs.getScheme()
+              + " does not support snapshot.");
     }
     try {
       getSnapshotDiffReportMethod(srcFs);
+    } catch (NoSuchMethodException e) {
+      throw new IllegalArgumentException(

Review Comment:
   Done.



##########
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpSync.java:
##########
@@ -161,20 +161,32 @@ private void checkFilesystemSupport(Path sourceDir, Path 
targetDir,
     if (!srcFs.hasPathCapability(sourceDir,
         CommonPathCapabilities.FS_SNAPSHOTS)) {
       throw new IllegalArgumentException(

Review Comment:
   Done.





> Distcp with snapshot diff to support Ozone filesystem.
> ------------------------------------------------------
>
>                 Key: HDFS-16911
>                 URL: https://issues.apache.org/jira/browse/HDFS-16911
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: distcp
>            Reporter: Sadanand Shenoy
>            Priority: Major
>              Labels: pull-request-available
>
> Currently in DistcpSync i.e the step which applies the diff b/w 2 provided 
> snapshots as arguments to the distcp job with -diff option, only 
> DistributedFilesystem and WebHDFS filesytems are supported.
>  
> {code:java}
> // currently we require both the source and the target file system are
> // DistributedFileSystem or (S)WebHdfsFileSystem.
> if (!(srcFs instanceof DistributedFileSystem
>         || srcFs instanceof WebHdfsFileSystem)) {
>   throw new IllegalArgumentException("Unsupported source file system: "
>       + srcFs.getScheme() + "://. " +
>       "Supported file systems: hdfs://, webhdfs:// and swebhdfs://.");
> }
> if (!(tgtFs instanceof DistributedFileSystem
>     || tgtFs instanceof WebHdfsFileSystem)) {
>   throw new IllegalArgumentException("Unsupported target file system: "
>       + tgtFs.getScheme() + "://. " +
>       "Supported file systems: hdfs://, webhdfs:// and swebhdfs://.");
> }{code}
> As Ozone now supports snapshot feature after HDDS-6517, add support to use 
> distcp with ozone snapshots.
>  



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