jojochuang commented on a change in pull request #2892:
URL: https://github.com/apache/hadoop/pull/2892#discussion_r611367826
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File path:
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/CopyCommitter.java
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@@ -635,7 +635,10 @@ private void concatFileChunks(Configuration conf, Path
sourceFile,
++i;
}
}
+ long firstChunkLastModifiedTs = dstfs.getFileStatus(firstChunkFile)
+ .getModificationTime();
dstfs.concat(firstChunkFile, restChunkFiles);
+ dstfs.setTimes(firstChunkFile, firstChunkLastModifiedTs, -1);
Review comment:
Ah. interesting. Thanks for pointing out. I wasn't aware of that.
But I guess that makes sense for HDFS, since after rename, we update the
quota for src and dest parent directory, so we do need to update mtime for them.
however, we need to support other file systems and it's not clear how they
implement it.
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