Colin Patrick McCabe created HDFS-5182: ------------------------------------------
Summary: BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid Key: HDFS-5182 URL: https://issues.apache.org/jira/browse/HDFS-5182 Project: Hadoop HDFS Issue Type: Sub-task Components: hdfs-client Affects Versions: HDFS-4949 Reporter: Colin Patrick McCabe Assignee: Colin Patrick McCabe BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid. This implies adding a new field to the response to REQUEST_SHORT_CIRCUIT_FDS. We also need some kind of heartbeat from the client to the DN, so that the DN can inform the client when the mapped region is no longer locked into memory. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira