Gopal V created HDFS-14345:
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Summary: fs.BufferedFSInputStream::read is synchronized
Key: HDFS-14345
URL: https://issues.apache.org/jira/browse/HDFS-14345
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Gopal V
BufferedInputStream::read() has performance issues - this can be fixed by
wrapping the stream in another non-synchronized buffered inputstream, but that
incurs memory copy overheads and is sub-optimal.
https://github.com/openjdk/jdk/blob/master/src/java.base/share/classes/java/io/BufferedInputStream.java#L269
Hadoop fs streams aren't thread-safe (except for ReadFully) and are stateful
for position, so this synchronization is purely a tax without benefit.
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