Return-Path: X-Original-To: apmail-hadoop-mapreduce-dev-archive@minotaur.apache.org Delivered-To: apmail-hadoop-mapreduce-dev-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 9FDC9DA88 for ; Mon, 10 Dec 2012 05:17:33 +0000 (UTC) Received: (qmail 84884 invoked by uid 500); 10 Dec 2012 05:17:33 -0000 Delivered-To: apmail-hadoop-mapreduce-dev-archive@hadoop.apache.org Received: (qmail 84521 invoked by uid 500); 10 Dec 2012 05:17:25 -0000 Mailing-List: contact mapreduce-dev-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: mapreduce-dev@hadoop.apache.org Delivered-To: mailing list mapreduce-dev@hadoop.apache.org Received: (qmail 82925 invoked by uid 99); 10 Dec 2012 05:17:21 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 10 Dec 2012 05:17:21 +0000 Date: Mon, 10 Dec 2012 05:17:21 +0000 (UTC) From: "Tsuyoshi OZAWA (JIRA)" To: mapreduce-dev@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Created] (MAPREDUCE-4863) Adding aggregationWaitMap for node-level combiner. MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 Tsuyoshi OZAWA created MAPREDUCE-4863: ----------------------------------------- Summary: Adding aggregationWaitMap for node-level combiner. Key: MAPREDUCE-4863 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4863 Project: Hadoop Map/Reduce Issue Type: Sub-task Components: applicationmaster Affects Versions: 3.0.0 Reporter: Tsuyoshi OZAWA Assignee: Tsuyoshi OZAWA To manage node/rack-level combining, MRAppMaster needs to have a management information about outputs of completed MapTasks to be aggregated. AggregationWaitMap is used so that MRAppMaster decides whether or not MapTasks start to combine local MapOutputFiles. AggregationWaitMap is a abstraction class of ConcurrentHashMap. These Events are candidate files to be aggregated. When MapTasks are completed, MRAppMaster buffer TaskAttemptCompletionEvent into AggregationWaitMap to delay reducers' fethcing outputs from mappers until node-level aggregation are finished. After node-level aggreagtion, MRAppMaster write back mapAttemptCompletionEvents, to restart reducers' feching outputs from mappers. -- 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