Colin Patrick McCabe created HDFS-6695:
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Summary: Investigate using Java 7's nonblocking file I/O in
BlockReaderLocal to implement read timeouts
Key: HDFS-6695
URL: https://issues.apache.org/jira/browse/HDFS-6695
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Colin Patrick McCabe
In BlockReaderLocal, the "read" system call could block for a long time if the
disk drive is having problems, or there is a huge amount of I/O contention.
This might cause poor latency performance.
In the remote block readers, we have implemented a read timeout, but we don't
have one for the local block reader, since {{FileChannel#read}} doesn't support
this.
Once we move to JDK 7, we should investigate the {{java.nio.file}} nonblocking
file I/O package to see if it could be used to implement read timeouts.
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