Sital Kedia created SPARK-21113:
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Summary: Support for read ahead input stream to amortize disk IO
cost in the Spill reader
Key: SPARK-21113
URL: https://issues.apache.org/jira/browse/SPARK-21113
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.0.2
Reporter: Sital Kedia
Priority: Minor
Profiling some of our big jobs, we see that around 30% of the time is being
spent in reading the spill files from disk. In order to amortize the disk IO
cost, the idea is to implement a read ahead input stream which which
asynchronously reads ahead from the underlying input stream when specified
amount of data has been read from the current buffer. It does it by maintaining
two buffer - active buffer and read ahead buffer. Active buffer contains data
which should be returned when a read() call is issued. The read ahead buffer is
used to asynchronously read from the underlying input stream and once the
current active buffer is exhausted, we flip the two buffers so that we can
start reading from the read ahead buffer without being blocked in disk I/O.
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