From solr-user-return-149773-archive-asf-public=cust-asf.ponee.io@lucene.apache.org Thu Sep 19 15:42:49 2019 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 [207.244.88.153]) by mx-eu-01.ponee.io (Postfix) with SMTP id BF73818062C for ; Thu, 19 Sep 2019 17:42:48 +0200 (CEST) Received: (qmail 15942 invoked by uid 500); 19 Sep 2019 15:42:45 -0000 Mailing-List: contact solr-user-help@lucene.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: solr-user@lucene.apache.org Delivered-To: mailing list solr-user@lucene.apache.org Delivered-To: moderator for solr-user@lucene.apache.org Received: (qmail 67730 invoked by uid 99); 19 Sep 2019 15:22:41 -0000 X-Virus-Scanned: Debian amavisd-new at spamd4-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 1.072 X-Spam-Level: * X-Spam-Status: No, score=1.072 tagged_above=-999 required=6.31 tests=[RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_SOFTFAIL=0.972, URIBL_BLOCKED=0.001, URI_HEX=0.1] autolearn=disabled Received-SPF: Softfail (mailfrom) identity=mailfrom; client-ip=162.255.23.22; helo=n3.nabble.com; envelope-from=hareesh.jagannathan@bestbuy.com; receiver= Date: Thu, 19 Sep 2019 08:22:36 -0700 (MST) From: harjagsbby To: solr-user@lucene.apache.org Message-ID: <1568906556540-0.post@n3.nabble.com> Subject: Solr behaves wonky when zookeeper quorom is messed up. MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit In our PROD SOLR cluster(7.6 and ZK:3.4.9) when Zookeeper leader fails Zookeeper enter an infinite leader election loop which makes SOLR instable. Solr Fails to index(as Expected with error "Remote error message: Cannot talk to ZooKeeper - Updates are disabled") and CPU spikes up. This is a know ZK bug https://issues.apache.org/jira/browse/ZOOKEEPER-2164. below are my question: 1. Solr behaving Wonky when ZK quorom is affected is expected but is there a work around? 2. The ZK bug is fixed in 3.5.6 is solr7.6 compatible with ZK 3.5.6? 3. Anyone have an opinion around "fast leader election" vs "original UDP-based" of ZK. Will cahnge election algorithm version from 3->0 solve the issue? -- Sent from: https://lucene.472066.n3.nabble.com/Solr-User-f472068.html