William Lo created GOBBLIN-2082:
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Summary: Manifest distcp creates extra folders when publishing
files
Key: GOBBLIN-2082
URL: https://issues.apache.org/jira/browse/GOBBLIN-2082
Project: Apache Gobblin
Issue Type: Bug
Components: gobblin-core
Reporter: William Lo
Assignee: Abhishek Tiwari
Manifest distcp often creates large file directory structures when copying
files from one location to another. There is a risk when concurrently
publishing files from a directory structure where the folders may not exist
before renaming files, described by the javadoc:
{code:java}
* Renames a src {@link Path} on fs {@link FileSystem} to a dst {@link Path}. If
fs is a {@link LocalFileSystem} and
* src is a directory then {@link File#renameTo} is called directly to avoid a
directory rename race condition where
* {@link org.apache.hadoop.fs.RawLocalFileSystem#rename} copies the conflicting
src directory into dst resulting in
* an extra nested level, such as /root/a/b/c/e/e where e is repeated. {code}
Given that on HDFS it does not use a RawLocalFileSystem in many
implementations, we want to pre-create the folders copied sequentially to
safely create the folders before publishing the files.
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