From common-issues-return-149126-archive-asf-public=cust-asf.ponee.io@hadoop.apache.org Fri Mar 2 19:04:09 2018 Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by mx-eu-01.ponee.io (Postfix) with SMTP id 7C200180671 for ; Fri, 2 Mar 2018 19:04:08 +0100 (CET) Received: (qmail 82505 invoked by uid 500); 2 Mar 2018 18:04:07 -0000 Mailing-List: contact common-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list common-issues@hadoop.apache.org Received: (qmail 82349 invoked by uid 99); 2 Mar 2018 18:04:07 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd3-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 02 Mar 2018 18:04:06 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd3-us-west.apache.org (ASF Mail Server at spamd3-us-west.apache.org) with ESMTP id 9901E18053B for ; Fri, 2 Mar 2018 18:04:06 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd3-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -110.311 X-Spam-Level: X-Spam-Status: No, score=-110.311 tagged_above=-999 required=6.31 tests=[ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, USER_IN_DEF_SPF_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=disabled Received: from mx1-lw-eu.apache.org ([10.40.0.8]) by localhost (spamd3-us-west.apache.org [10.40.0.10]) (amavisd-new, port 10024) with ESMTP id 2Mpgr1PJghWg for ; Fri, 2 Mar 2018 18:04:04 +0000 (UTC) Received: from mailrelay1-us-west.apache.org (mailrelay1-us-west.apache.org [209.188.14.139]) by mx1-lw-eu.apache.org (ASF Mail Server at mx1-lw-eu.apache.org) with ESMTP id 0324D5F503 for ; Fri, 2 Mar 2018 18:04:04 +0000 (UTC) Received: from jira-lw-us.apache.org (unknown [207.244.88.139]) by mailrelay1-us-west.apache.org (ASF Mail Server at mailrelay1-us-west.apache.org) with ESMTP id 72C5EE0218 for ; Fri, 2 Mar 2018 18:04:02 +0000 (UTC) Received: from jira-lw-us.apache.org (localhost [127.0.0.1]) by jira-lw-us.apache.org (ASF Mail Server at jira-lw-us.apache.org) with ESMTP id B329824778 for ; Fri, 2 Mar 2018 18:04:00 +0000 (UTC) Date: Fri, 2 Mar 2018 18:04:00 +0000 (UTC) From: "Steve Loughran (JIRA)" To: common-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Created] (HADOOP-15281) Distcp to add no-rename copy option MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 Steve Loughran created HADOOP-15281: --------------------------------------- Summary: Distcp to add no-rename copy option Key: HADOOP-15281 URL: https://issues.apache.org/jira/browse/HADOOP-15281 Project: Hadoop Common Issue Type: Improvement Components: tools/distcp Affects Versions: 3.0.0 Reporter: Steve Loughran Assignee: Steve Loughran Currently Distcp uploads a file by two strategies # append parts # copy to temp then rename option 2 executes the following swquence in {{promoteTmpToTarget}} {code} if ((fs.exists(target) && !fs.delete(target, false)) || (!fs.exists(target.getParent()) && !fs.mkdirs(target.getParent())) || !fs.rename(tmpTarget, target)) { throw new IOException("Failed to promote tmp-file:" + tmpTarget + " to: " + target); } {code} For any object store, that's a lot of HTTP requests; for S3A you are looking at 12+ requests and an O(data) copy call. This is not a good upload strategy for any store which manifests its output atomically at the end of the write(). Proposed: add a switch to write direct to the dest path. either a conf option or a CLI option -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscribe@hadoop.apache.org For additional commands, e-mail: common-issues-help@hadoop.apache.org