Brachi Packter created BEAM-12883:
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             Summary: FileSystems ReadableFileCoder should support 
Metadata#lastModifiedMillis()
                 Key: BEAM-12883
                 URL: https://issues.apache.org/jira/browse/BEAM-12883
             Project: Beam
          Issue Type: Improvement
          Components: sdk-java-core
            Reporter: Brachi Packter


Currently, there is a separated coder for Metadata which cares about 
`Metadata#lastModifiedMillis()`.
The issue is that the `ReadableFileCoder` always uses the default `Metadata` 
coder.
We need to create a similar coder for `ReadableFileCoder`: 
``ReadableFileCoderV2` which just use the corresponding `MetadataCoderV2`.

Without doing so `lastModifiedMillis` will remain zero.

There is also no way to create custom coder in our side since 
`FileIO.ReadableFile` has no public method to initiate new instance of it.



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