Return-Path: X-Original-To: apmail-hbase-issues-archive@www.apache.org Delivered-To: apmail-hbase-issues-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 20647D308 for ; Sat, 25 May 2013 22:24:21 +0000 (UTC) Received: (qmail 69428 invoked by uid 500); 25 May 2013 22:24:20 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 69376 invoked by uid 500); 25 May 2013 22:24:20 -0000 Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list issues@hbase.apache.org Received: (qmail 69243 invoked by uid 99); 25 May 2013 22:24:20 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 25 May 2013 22:24:20 +0000 Date: Sat, 25 May 2013 22:24:20 +0000 (UTC) From: "Todd Lipcon (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HBASE-8323) Low hanging checksum improvements MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/HBASE-8323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667167#comment-13667167 ] Todd Lipcon commented on HBASE-8323: ------------------------------------ bq. Enable NativeCrc32 to be used as a checksum algo. It is not clear how much gain we can expect over pure java CRC32. The gain's really big -- something around 10x CPU savings. Obviously that doesn't turn into a 10x improvement of HBase throughput, but I bet it would be substantial. > Low hanging checksum improvements > --------------------------------- > > Key: HBASE-8323 > URL: https://issues.apache.org/jira/browse/HBASE-8323 > Project: HBase > Issue Type: Improvement > Reporter: Enis Soztutar > > Over at Hadoop land, [~tlipcon] had done some improvements for checksums, a native implementation for CRC32C (HADOOP-7445) and bulk verify of checksums (HADOOP-7444). > In HBase, we can do > - Also develop a bulk verify API. Regardless of hbase.hstore.bytes.per.checksum we always want to verify of the whole checksum for the hfile block. > - Enable NativeCrc32 to be used as a checksum algo. It is not clear how much gain we can expect over pure java CRC32. > Though, longer term we should focus on convincing hdfs guys for inline checksums (HDFS-2699) -- 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