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 54ADF18751 for ; Fri, 24 Apr 2015 07:18:44 +0000 (UTC) Received: (qmail 638 invoked by uid 500); 24 Apr 2015 07:18:39 -0000 Delivered-To: apmail-hadoop-common-issues-archive@hadoop.apache.org Received: (qmail 578 invoked by uid 500); 24 Apr 2015 07:18:39 -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 562 invoked by uid 99); 24 Apr 2015 07:18:39 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 24 Apr 2015 07:18:39 +0000 Date: Fri, 24 Apr 2015 07:18:38 +0000 (UTC) From: "jack liuquan (JIRA)" To: common-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HADOOP-11828) Implement the Hitchhiker erasure coding algorithm 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/HADOOP-11828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14510597#comment-14510597 ] jack liuquan commented on HADOOP-11828: --------------------------------------- Hi Kai, Thank you for your review. bq.* Please rebase with latest branch. Your codebase is rather old. sorry, I'm not sure. I add my codes based on the latest HDFS-7285 branch. Is that not right? bq.* Please remove codes for other modes for now, even in tests. OK, I will remove the codes not used in Hitchhiker-XOR. > Implement the Hitchhiker erasure coding algorithm > ------------------------------------------------- > > Key: HADOOP-11828 > URL: https://issues.apache.org/jira/browse/HADOOP-11828 > Project: Hadoop Common > Issue Type: Sub-task > Reporter: Zhe Zhang > Assignee: jack liuquan > Attachments: 7715-hitchhikerXOR-v2-testcode.patch, 7715-hitchhikerXOR-v2.patch, HADOOP-11828-hitchhikerXOR-V3.patch, HDFS-7715-hhxor-decoder.patch, HDFS-7715-hhxor-encoder.patch > > > [Hitchhiker | http://www.eecs.berkeley.edu/~nihar/publications/Hitchhiker_SIGCOMM14.pdf] is a new erasure coding algorithm developed as a research project at UC Berkeley. It has been shown to reduce network traffic and disk I/O by 25%-45% during data reconstruction. This JIRA aims to introduce Hitchhiker to the HDFS-EC framework, as one of the pluggable codec algorithms. > The existing implementation is based on HDFS-RAID. -- This message was sent by Atlassian JIRA (v6.3.4#6332)