Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id 3A9A8200B35 for ; Tue, 5 Jul 2016 18:45:13 +0200 (CEST) Received: by cust-asf.ponee.io (Postfix) id 39614160A2C; Tue, 5 Jul 2016 16:45:13 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id 74FD8160A76 for ; Tue, 5 Jul 2016 18:45:12 +0200 (CEST) Received: (qmail 6153 invoked by uid 500); 5 Jul 2016 16:45:11 -0000 Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@cassandra.apache.org Delivered-To: mailing list commits@cassandra.apache.org Received: (qmail 5653 invoked by uid 99); 5 Jul 2016 16:45:11 -0000 Received: from arcas.apache.org (HELO arcas) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 05 Jul 2016 16:45:11 +0000 Received: from arcas.apache.org (localhost [127.0.0.1]) by arcas (Postfix) with ESMTP id 336EE2C02AC for ; Tue, 5 Jul 2016 16:45:11 +0000 (UTC) Date: Tue, 5 Jul 2016 16:45:11 +0000 (UTC) From: "Ariel Weisberg (JIRA)" To: commits@cassandra.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (CASSANDRA-12104) Handle coalesce efforts for inter-dc traffic discretely from intra-dc traffic MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 archived-at: Tue, 05 Jul 2016 16:45:13 -0000 [ https://issues.apache.org/jira/browse/CASSANDRA-12104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362749#comment-15362749 ] Ariel Weisberg commented on CASSANDRA-12104: -------------------------------------------- How were you able to tell they had a positive on inter-dc traffic if you were experiencing a negative impact to intra-dc traffic? What is the metric you are using? > Handle coalesce efforts for inter-dc traffic discretely from intra-dc traffic > ----------------------------------------------------------------------------- > > Key: CASSANDRA-12104 > URL: https://issues.apache.org/jira/browse/CASSANDRA-12104 > Project: Cassandra > Issue Type: Improvement > Reporter: Thom Valley > Priority: Minor > > In relationship to CASSANDRA-8692, we have discovered that pushing coalescing windows to the point where they have a positive impact on inter-dc traffic overhead appears to have causes delays in intra-dc traffic (namely, quorum requests between nodes). Having the same coalescing strategy apply to all messages (especially intra-dc request/response messages) seems like a bad idea. > This was in a 5 DC environment with from 30 to 130 ms of latency between the DCs. Local network was entirely unrestricted 10G ethernet. > Being able to apply different coalescing rules to those two classifications of traffic would allow much more effective tuning of the coalescing strategies, save inter-dc bandwidth while not having any impact on intra-dc message handling. -- This message was sent by Atlassian JIRA (v6.3.4#6332)