HADOOP-19354. S3AInputStream to be created by factory under S3AStore. #7237
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First iteration * Factory interface with a parameter object creation method * Base class AbstractS3AInputStream for all streams to create * S3AInputStream subclasses that and has a factory * Production and test code to use it Not done * Input stream callbacks pushed down to S3Store * S3Store to dynamically choose factory at startup, stop in close() * S3Store to implement the factory interface, completing final binding operations (callbacks, stats) Change-Id: I8d0f86ca1f3463d4987a43924f155ce0c0644180
Revision API: Make clear this is part of the fundamental store Model: * abstract stream class is now ObjectInputStream * interface is ObjectInputStreamFactory * move to package org.apache.hadoop.fs.s3a.impl.model Implementation: Prefetching stream is created this way too; adds one extra parameter. Maybe we should pass conf down too Change-Id: I5bbb5dfe585528b047a649b6c82a9d0318c7e91e
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Description of PR
This PR makes some additional changes to the initial PR from Steve: #7214.
Not sure if I got all of this right, but here are a few callouts:
Thought of moving InputStreamCallbacks into S3AStore, but I don't think that is the right place for it. InputStreamCallBacks uses
S3AFileSystemOperations, which usesS3AStore, so you end up in a dependency mess. Instead, move them to a separate classInputStreamCallbacksImpl, which keeps the code out of S3AFileSystem. Maybe there is a better way to do this, but I couldn't think of anything.Adds a new config,
fs.s3a.input.stream.type. This can be set toclassic,prefetch,analytics. Believe this is better than having multipleprefetch.enabledandanalytics.enabledflags.Could not figure out what was meant by "S3Store to implement the factory interface, completing final binding operations (callbacks, stats)" in Steve's original PR, let's discuss.
Let's merge this into trunk first, and then rebase https://github.com/apache/hadoop/tree/feature-HADOOP-19363-analytics-accelerator-s3 on top of it, and move the analytics stream creation code into the new factory.
This is a draft PR, was just attempting to complete the original PR.
How was this patch tested?
Not tested. Whoever picks this up for completion can test!