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Posted to hdfs-issues@hadoop.apache.org by "Sadanand Shenoy (Jira)" <ji...@apache.org> on 2023/03/14 12:41:00 UTC
[jira] [Commented] (HDFS-16911) Distcp with snapshot diff to support Ozone filesystem.
[ https://issues.apache.org/jira/browse/HDFS-16911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700141#comment-17700141 ]
Sadanand Shenoy commented on HDFS-16911:
----------------------------------------
[~ayushtkn] , The HADOOP-17719 change is almost similar and a rather simpler approach and I feel we can go with that change only. I have changed my PR to use the same approach , almost a copy of [#3157|https://github.com/apache/hadoop/pull/3157/files%C2%A0] (only difference is a test addition and a getter method for toSnapshot field as this was needed when we implemented getsnapshotDiffReport in Ozone FS).
I think the older PR has been open for a long time and has conflicts, [~iwasakims] could you also please take a look at this [PR|https://github.com/apache/hadoop/pull/5364] and let me know if there are any objections.
> 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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