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dhruba borthakur commented on HDFS-2246: ---------------------------------------- > synchronized LinkedHashMap Why not a concurrent hash map? we have around 30K blocks per datanode and with SATA disks becoming 4TB or larger next year, we might have close to 100K blocks per datanode perhaps. > Shortcut a local client reads to a Datanodes files directly > ----------------------------------------------------------- > > Key: HDFS-2246 > URL: https://issues.apache.org/jira/browse/HDFS-2246 > Project: Hadoop HDFS > Issue Type: Improvement > Reporter: Sanjay Radia > Attachments: 0001-HDFS-347.-Local-reads.patch, > HDFS-2246-branch-0.20-security-205.patch, > HDFS-2246-branch-0.20-security-205.patch, > HDFS-2246-branch-0.20-security.patch, HDFS-2246.20s.1.patch, > HDFS-2246.20s.2.txt, HDFS-2246.20s.3.txt, HDFS-2246.20s.4.txt, > HDFS-2246.20s.patch, localReadShortcut20-security.2patch > > -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira