[ https://issues.apache.org/jira/browse/CASSANDRA-3610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204221#comment-13204221 ]
Jonathan Ellis commented on CASSANDRA-3610: ------------------------------------------- Dunno, this seems a little fragile to me. What does it look like with OpenJDK7 / Oracle JDK 7, which is what people are going to start transitioning to soon as JDK6 gets EOLed? (Oracle J7 is built from the OpenJDK tree so I would expect much more similarity there.) > Checksum improvement for CompressedRandomAccessReader > ----------------------------------------------------- > > Key: CASSANDRA-3610 > URL: https://issues.apache.org/jira/browse/CASSANDRA-3610 > Project: Cassandra > Issue Type: Improvement > Components: Core > Affects Versions: 1.1 > Environment: JVM > Reporter: Vijay > Assignee: Vijay > Priority: Minor > Fix For: 1.1 > > Attachments: 0001-use-pure-java-CRC32-v2.patch, > 0001-use-pure-java-CRC32-v3.patch, 0001-use-pure-java-CRC32.patch, > TestCrc32Performance.java > > > When compression is on, Currently we see checksum taking up about 40% of the > CPU more than snappy library. > Looks like hadoop solved it by implementing their own checksum, we can either > use it or implement something like that. > http://images.slidesharecdn.com/1toddlipconyanpeichen-cloudera-hadoopandperformance-final-111110132228-phpapp01-slide-15-768.jpg?1321043717 > in our test env it provided 50% improvement over native implementation which > uses jni to call the OS. -- 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