[ https://issues.apache.org/jira/browse/HDFS-4960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Varun Sharma updated HDFS-4960: ------------------------------- Issue Type: Bug (was: Improvement) > Unnecessary .meta seeks even when skip checksum is true > ------------------------------------------------------- > > Key: HDFS-4960 > URL: https://issues.apache.org/jira/browse/HDFS-4960 > Project: Hadoop HDFS > Issue Type: Bug > Affects Versions: 3.0.0, 2.1.0-beta > Reporter: Varun Sharma > Assignee: Varun Sharma > Attachments: 4960-branch2.patch, 4960-trunk.patch > > > While attempting to benchmark an HBase + Hadoop 2.0 setup on SSDs, we found > unnecessary seeks into .meta files, each seek was a 7 byte read at the head > of the file - this attempts to validate the version #. Since the client is > requesting no-checksum, we should not be needing to touch the .meta file at > all. > Since the purpose of skip checksum is to also avoid the performance penalty > of the extra seek, we should not be seeking into .meta if skip checksum is > true -- 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