Return-Path: X-Original-To: apmail-hadoop-hdfs-dev-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-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 A823F18167 for ; Wed, 20 May 2015 02:09:01 +0000 (UTC) Received: (qmail 38807 invoked by uid 500); 20 May 2015 02:09:00 -0000 Delivered-To: apmail-hadoop-hdfs-dev-archive@hadoop.apache.org Received: (qmail 38709 invoked by uid 500); 20 May 2015 02:09:00 -0000 Mailing-List: contact hdfs-dev-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-dev@hadoop.apache.org Delivered-To: mailing list hdfs-dev@hadoop.apache.org Received: (qmail 38697 invoked by uid 99); 20 May 2015 02:08:59 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 20 May 2015 02:08:59 +0000 Date: Wed, 20 May 2015 02:08:59 +0000 (UTC) From: "Tsz Wo Nicholas Sze (JIRA)" To: hdfs-dev@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Created] (HDFS-8437) Fail/warn if HDFS is setup with an even number of QJMs. MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 Tsz Wo Nicholas Sze created HDFS-8437: ----------------------------------------- Summary: Fail/warn if HDFS is setup with an even number of QJMs. Key: HDFS-8437 URL: https://issues.apache.org/jira/browse/HDFS-8437 Project: Hadoop HDFS Issue Type: Improvement Reporter: Tsz Wo Nicholas Sze Assignee: Tsz Wo Nicholas Sze Priority: Minor When setting an even number (2n, n>1) of QJMs, the number of failure it can tolerate is the same as one node less (2n-1). Therefore, it does not make sense to setup with an even number of QJMs. We should either fail it or warn the users. -- This message was sent by Atlassian JIRA (v6.3.4#6332)