Ahmar Suhail created HADOOP-18378:
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Summary: Implement readFully(long position, byte[] buffer, int
offset, int length)
Key: HADOOP-18378
URL: https://issues.apache.org/jira/browse/HADOOP-18378
Project: Hadoop Common
Issue Type: Sub-task
Reporter: Ahmar Suhail
Implement readFully(long position, byte[] buffer, int offset, int length) in
PrefetchingInputStream, as it currently uses FSInputStream's
[readFully|https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSInputStream.java#L136]
which calls read(long position, byte[] buffer, int offset, int length).
This read then seeks to the position (which is ok), but then seeks back to the
original starting position at the end (so always seeking back to 0). this is
pretty bad for the prefetching implementation as it means lots of caching to
disk and getting blocks from disk.
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