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https://issues.apache.org/jira/browse/HDFS-6695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065173#comment-14065173
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Chris Nauroth commented on HDFS-6695:
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I'm linking this to HADOOP-9590, which was created a while back as a sort of
umbrella jira to track ideas for migration to improved JDK7 APIs.
> 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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