Return-Path: X-Original-To: apmail-hadoop-common-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-common-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id D824663BC for ; Wed, 13 Jul 2011 20:06:24 +0000 (UTC) Received: (qmail 84064 invoked by uid 500); 13 Jul 2011 20:06:24 -0000 Delivered-To: apmail-hadoop-common-issues-archive@hadoop.apache.org Received: (qmail 83950 invoked by uid 500); 13 Jul 2011 20:06:24 -0000 Mailing-List: contact common-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-issues@hadoop.apache.org Delivered-To: mailing list common-issues@hadoop.apache.org Received: (qmail 83929 invoked by uid 99); 13 Jul 2011 20:06:23 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 13 Jul 2011 20:06:23 +0000 X-ASF-Spam-Status: No, hits=-2000.0 required=5.0 tests=ALL_TRUSTED,T_RP_MATCHES_RCVD X-Spam-Check-By: apache.org Received: from [140.211.11.116] (HELO hel.zones.apache.org) (140.211.11.116) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 13 Jul 2011 20:06:21 +0000 Received: from hel.zones.apache.org (hel.zones.apache.org [140.211.11.116]) by hel.zones.apache.org (Postfix) with ESMTP id E9634526B8 for ; Wed, 13 Jul 2011 20:05:59 +0000 (UTC) Date: Wed, 13 Jul 2011 20:05:59 +0000 (UTC) From: "Hudson (JIRA)" To: common-issues@hadoop.apache.org Message-ID: <625057095.11063.1310587559952.JavaMail.tomcat@hel.zones.apache.org> In-Reply-To: <679844444.2674.1309926976617.JavaMail.tomcat@hel.zones.apache.org> Subject: [jira] [Commented] (HADOOP-7443) Add CRC32C as another DataChecksum implementation MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 X-Virus-Checked: Checked by ClamAV on apache.org [ https://issues.apache.org/jira/browse/HADOOP-7443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064812#comment-13064812 ] Hudson commented on HADOOP-7443: -------------------------------- Integrated in Hadoop-Common-trunk-Commit #689 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/689/]) HADOOP-7443. Add CRC32C as another DataChecksum implementation. Contributed by Todd Lipcon. todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1146300 Files : * /hadoop/common/trunk/common/src/test/core/org/apache/hadoop/util/TestPureJavaCrc32.java * /hadoop/common/trunk/common/CHANGES.txt * /hadoop/common/trunk/common/src/test/core/org/apache/hadoop/util/TestDataChecksum.java * /hadoop/common/trunk/common/src/java/org/apache/hadoop/util/DataChecksum.java * /hadoop/common/trunk/common/src/java/org/apache/hadoop/util/PureJavaCrc32C.java > Add CRC32C as another DataChecksum implementation > ------------------------------------------------- > > Key: HADOOP-7443 > URL: https://issues.apache.org/jira/browse/HADOOP-7443 > Project: Hadoop Common > Issue Type: New Feature > Components: io, util > Reporter: Todd Lipcon > Assignee: Todd Lipcon > Fix For: 0.23.0 > > Attachments: hadoop-7443.txt, hadoop-7443.txt > > > CRC32C is another checksum very similar to our existing CRC32, but with a different polynomial. The chief advantage of this other polynomial is that SSE4.2 includes hardware support for its calculation. HDFS-2080 is the umbrella JIRA which proposes using this new polynomial to save substantial amounts of CPU. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira