Return-Path: X-Original-To: apmail-hadoop-hdfs-user-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-user-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id B377A10B31 for ; Thu, 23 Jan 2014 14:58:00 +0000 (UTC) Received: (qmail 32298 invoked by uid 500); 23 Jan 2014 14:57:52 -0000 Delivered-To: apmail-hadoop-hdfs-user-archive@hadoop.apache.org Received: (qmail 32057 invoked by uid 500); 23 Jan 2014 14:57:52 -0000 Mailing-List: contact user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@hadoop.apache.org Delivered-To: mailing list user@hadoop.apache.org Received: (qmail 32050 invoked by uid 99); 23 Jan 2014 14:57:51 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 23 Jan 2014 14:57:51 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of john.lilley@redpoint.net designates 206.225.164.217 as permitted sender) Received: from [206.225.164.217] (HELO hub021-nj-2.exch021.serverdata.net) (206.225.164.217) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 23 Jan 2014 14:57:45 +0000 Received: from MBX021-E3-NJ-2.exch021.domain.local ([10.240.4.78]) by HUB021-NJ-2.exch021.domain.local ([10.240.4.33]) with mapi id 14.03.0158.001; Thu, 23 Jan 2014 06:57:24 -0800 From: John Lilley To: "user@hadoop.apache.org" Subject: HDFS buffer sizes Thread-Topic: HDFS buffer sizes Thread-Index: Ac8YSzubQQz+RZztQrq5Dp4+jX3rLA== Date: Thu, 23 Jan 2014 14:57:23 +0000 Message-ID: <869970D71E26D7498BDAC4E1CA92226B86E1CA84@MBX021-E3-NJ-2.exch021.domain.local> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [173.160.43.60] Content-Type: multipart/alternative; boundary="_000_869970D71E26D7498BDAC4E1CA92226B86E1CA84MBX021E3NJ2exch_" MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org --_000_869970D71E26D7498BDAC4E1CA92226B86E1CA84MBX021E3NJ2exch_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable What is the interaction between dfs.stream-buffer-size and dfs.client-write= -packet-size? I see that the default for dfs.stream-buffer-size is 4K. Does anyone have = experience using larger buffers to optimize large writes? Thanks John --_000_869970D71E26D7498BDAC4E1CA92226B86E1CA84MBX021E3NJ2exch_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

What is the interaction between dfs.stream-buffer-size and dfs= .client-write-packet-size?

I see that the default for dfs.stream-buffer-size is= 4K. Does anyone have experience using larger buffers to optimize lar= ge writes?

Thanks &nbs= p; &= nbsp; &nbs= p; &= nbsp; &nbs= p; &= nbsp; &nbs= p;

John

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