Colin Patrick McCabe created HDFS-6695: ------------------------------------------
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. -- This message was sent by Atlassian JIRA (v6.2#6252)