Return-Path: Delivered-To: apmail-hadoop-zookeeper-user-archive@minotaur.apache.org Received: (qmail 52061 invoked from network); 30 Jun 2010 16:33:39 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 30 Jun 2010 16:33:39 -0000 Received: (qmail 54034 invoked by uid 500); 30 Jun 2010 16:33:38 -0000 Delivered-To: apmail-hadoop-zookeeper-user-archive@hadoop.apache.org Received: (qmail 53992 invoked by uid 500); 30 Jun 2010 16:33:37 -0000 Mailing-List: contact zookeeper-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: zookeeper-user@hadoop.apache.org Delivered-To: mailing list zookeeper-user@hadoop.apache.org Delivered-To: moderator for zookeeper-user@hadoop.apache.org Received: (qmail 5237 invoked by uid 99); 30 Jun 2010 14:47:53 -0000 X-ASF-Spam-Status: No, hits=-1.3 required=10.0 tests=RCVD_IN_DNSWL_MED,SPF_SOFTFAIL X-Spam-Check-By: apache.org Received-SPF: softfail (nike.apache.org: transitioning domain of bryan@systap.com does not designate 208.65.144.70 as permitted sender) X-MXL-Hash: 4c2b58fb2b64297c-496bf1689a98e129fc68378031c8187b53f29ec7 X-MXL-Hash: 4c2b58f965fa2db6-04c22b5db0e73e7856ba47c53df415f9b3bcbabb From: Bryan Thompson To: "zookeeper-user@hadoop.apache.org" Date: Wed, 30 Jun 2010 09:45:16 -0500 Subject: Guaranteed message delivery until session timeout? Thread-Topic: Guaranteed message delivery until session timeout? Thread-Index: AcsYYtqCSHirLC88SdiaOGzto8xX6A== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Spam: [F=0.2000000000; CM=0.500; S=0.200(2010062801)] X-MAIL-FROM: X-SOURCE-IP: [216.166.12.32] X-AnalysisOut: [v=1.0 c=1 a=VyjWJHPzUmQA:10 a=GQCbJdZ--msA:10 a=VphdPIyG4k] X-AnalysisOut: [EA:10 a=kj9zAlcOel0A:10 a=zbe46bahRtDx8aUBN1lPzQ==:17 a=u3] X-AnalysisOut: [vw3ssCiC9pOLpYrQ8A:9 a=wksXW8h3ZkxDNgziMV8A:7 a=VUXrIJ0LDa] X-AnalysisOut: [RU-_oqMDbIisXw1ToA:4 a=CjuIK1q_8ugA:10] X-Virus-Checked: Checked by ClamAV on apache.org Hello, I am wondering what guarantees (if any) zookeeper provides for reliable mes= saging for operation return codes up to a session timeout. Basically, I wo= uld like to know whether a zookeeper client can rely on observing the retur= n code for a successful operation which creates an ephemeral (or ephemeral = sequential) znode -or- have a guarantee that its session was timed out and = the ephemeral znode destroyed. That is, does zookeeper provide guaranteed = delivery of the operation return code unless the session is invalidated by = a timeout? Thanks, Bryan