[ https://issues.apache.org/jira/browse/HDFS-918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jay Booth updated HDFS-918: --------------------------- Attachment: hdfs-918-branch20.2.patch Straightened out the block not found thing with Andrew, that was on his end, but then he found a resource leak that's fixed here -- I'll post a trunk patch which incorporates this fix and the previous fix shortly. > Use single Selector and small thread pool to replace many instances of > BlockSender for reads > -------------------------------------------------------------------------------------------- > > Key: HDFS-918 > URL: https://issues.apache.org/jira/browse/HDFS-918 > Project: Hadoop HDFS > Issue Type: Improvement > Components: data-node > Reporter: Jay Booth > Fix For: 0.22.0 > > Attachments: hdfs-918-20100201.patch, hdfs-918-20100203.patch, > hdfs-918-20100211.patch, hdfs-918-20100228.patch, hdfs-918-20100309.patch, > hdfs-918-branch20.2.patch, hdfs-multiplex.patch > > > Currently, on read requests, the DataXCeiver server allocates a new thread > per request, which must allocate its own buffers and leads to > higher-than-optimal CPU and memory usage by the sending threads. If we had a > single selector and a small threadpool to multiplex request packets, we could > theoretically achieve higher performance while taking up fewer resources and > leaving more CPU on datanodes available for mapred, hbase or whatever. This > can be done without changing any wire protocols. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.