[jira] Commented: (ZOOKEEPER-851) ZK lets any node to become an observer
[ https://issues.apache.org/jira/browse/ZOOKEEPER-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=12925927#action_12925927 ] Henry Robinson commented on ZOOKEEPER-851: -- Hi Vishal - Sorry for the slow turnaround on this one. It doesn't surprise me that this is the behaviour, although it's slightly unexpected that the node becomes an observer, rather than a follower. What evidence do you have for that? (Given that Mode: follower - I haven't checked the code in a while, but I would have thought it would print Mode: Observer). Henry ZK lets any node to become an observer -- Key: ZOOKEEPER-851 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-851 Project: Zookeeper Issue Type: Bug Components: quorum, server Affects Versions: 3.3.1 Reporter: Vishal K Priority: Critical Fix For: 3.4.0 I had a 3 node cluster running. The zoo.cfg on each contained 3 entries as show below: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 I wanted to add another node to the cluster. In fourth node's zoo.cfg, I created another entry for that node and started zk server. The zoo.cfg on the first 3 nodes was left unchanged. The fourth node was able to join the cluster even though the 3 nodes had no idea about the fourth node. zoo.cfg on fourth node: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 server.3=10.17.117.71:2888:3888 It looks like 10.17.117.71 is becoming an observer in this case. I was expecting that the leader will reject 10.17.117.71. # telnet 10.17.117.71 2181 Trying 10.17.117.71... Connected to 10.17.117.71. Escape character is '^]'. stat Zookeeper version: 3.3.0--1, built on 04/02/2010 22:40 GMT Clients: /10.17.117.71:37297[1](queued=0,recved=1,sent=0) Latency min/avg/max: 0/0/0 Received: 3 Sent: 2 Outstanding: 0 Zxid: 0x20065 Mode: follower Node count: 288 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Commented: (ZOOKEEPER-851) ZK lets any node to become an observer
[ https://issues.apache.org/jira/browse/ZOOKEEPER-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=12925997#action_12925997 ] Vishal K commented on ZOOKEEPER-851: I have not used observers yet. Looks like then I need to verify if this follower can become a leader. I think I had tried this. If I remember, the 4th node did not become a leader. But this was a while back. I will try it again and update the jira. ZK lets any node to become an observer -- Key: ZOOKEEPER-851 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-851 Project: Zookeeper Issue Type: Bug Components: quorum, server Affects Versions: 3.3.1 Reporter: Vishal K Priority: Critical Fix For: 3.4.0 I had a 3 node cluster running. The zoo.cfg on each contained 3 entries as show below: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 I wanted to add another node to the cluster. In fourth node's zoo.cfg, I created another entry for that node and started zk server. The zoo.cfg on the first 3 nodes was left unchanged. The fourth node was able to join the cluster even though the 3 nodes had no idea about the fourth node. zoo.cfg on fourth node: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 server.3=10.17.117.71:2888:3888 It looks like 10.17.117.71 is becoming an observer in this case. I was expecting that the leader will reject 10.17.117.71. # telnet 10.17.117.71 2181 Trying 10.17.117.71... Connected to 10.17.117.71. Escape character is '^]'. stat Zookeeper version: 3.3.0--1, built on 04/02/2010 22:40 GMT Clients: /10.17.117.71:37297[1](queued=0,recved=1,sent=0) Latency min/avg/max: 0/0/0 Received: 3 Sent: 2 Outstanding: 0 Zxid: 0x20065 Mode: follower Node count: 288 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Commented: (ZOOKEEPER-851) ZK lets any node to become an observer
[ https://issues.apache.org/jira/browse/ZOOKEEPER-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=12926016#action_12926016 ] Henry Robinson commented on ZOOKEEPER-851: -- I think what happens is that the leader happily lets the new follower connect, but that it won't be part of any voting procedure. It shouldn't become leader because no other nodes know about it to propose or support a vote for it. To add a new node, you'll need to incrementally restart every node in your cluster with the new config. ZK lets any node to become an observer -- Key: ZOOKEEPER-851 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-851 Project: Zookeeper Issue Type: Bug Components: quorum, server Affects Versions: 3.3.1 Reporter: Vishal K Priority: Critical Fix For: 3.4.0 I had a 3 node cluster running. The zoo.cfg on each contained 3 entries as show below: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 I wanted to add another node to the cluster. In fourth node's zoo.cfg, I created another entry for that node and started zk server. The zoo.cfg on the first 3 nodes was left unchanged. The fourth node was able to join the cluster even though the 3 nodes had no idea about the fourth node. zoo.cfg on fourth node: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 server.3=10.17.117.71:2888:3888 It looks like 10.17.117.71 is becoming an observer in this case. I was expecting that the leader will reject 10.17.117.71. # telnet 10.17.117.71 2181 Trying 10.17.117.71... Connected to 10.17.117.71. Escape character is '^]'. stat Zookeeper version: 3.3.0--1, built on 04/02/2010 22:40 GMT Clients: /10.17.117.71:37297[1](queued=0,recved=1,sent=0) Latency min/avg/max: 0/0/0 Received: 3 Sent: 2 Outstanding: 0 Zxid: 0x20065 Mode: follower Node count: 288 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
[jira] Commented: (ZOOKEEPER-851) ZK lets any node to become an observer
[ https://issues.apache.org/jira/browse/ZOOKEEPER-851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=12921340#action_12921340 ] Vishal K commented on ZOOKEEPER-851: Hi Henry , Any comments? Thanks. -Vishal ZK lets any node to become an observer -- Key: ZOOKEEPER-851 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-851 Project: Zookeeper Issue Type: Bug Components: quorum, server Affects Versions: 3.3.1 Reporter: Vishal K Priority: Critical Fix For: 3.4.0 I had a 3 node cluster running. The zoo.cfg on each contained 3 entries as show below: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 I wanted to add another node to the cluster. In fourth node's zoo.cfg, I created another entry for that node and started zk server. The zoo.cfg on the first 3 nodes was left unchanged. The fourth node was able to join the cluster even though the 3 nodes had no idea about the fourth node. zoo.cfg on fourth node: tickTime=2000 dataDir=/var/zookeeper clientPort=2181 initLimit=5 syncLimit=2 server.0=10.150.27.61:2888:3888 server.1=10.150.27.62:2888:3888 server.2=10.150.27.63:2888:3888 server.3=10.17.117.71:2888:3888 It looks like 10.17.117.71 is becoming an observer in this case. I was expecting that the leader will reject 10.17.117.71. # telnet 10.17.117.71 2181 Trying 10.17.117.71... Connected to 10.17.117.71. Escape character is '^]'. stat Zookeeper version: 3.3.0--1, built on 04/02/2010 22:40 GMT Clients: /10.17.117.71:37297[1](queued=0,recved=1,sent=0) Latency min/avg/max: 0/0/0 Received: 3 Sent: 2 Outstanding: 0 Zxid: 0x20065 Mode: follower Node count: 288 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.
