Hi Mahesh, The apache mailing list allows only plain text and I can't see the attached append.java. Could you please upload to cloud and provide the access link?
BTW, I noticed that you are using COMPARE_AND_SET mode in setConfiguration request. In that way, it’s required to setServersInCurrentConf with original old group (n0,n1,n2) and setServersInNewConf with the intended new group (n0, n1, n2, n3). Thanks, William > 2023年12月12日 11:27，Mahesh Garlapati <[email protected]> > 写道： > > Hello William, > > << please find my inline answers >> > > Thanks > Mahesh Reddy. > > From: William Song <[email protected] <mailto:[email protected]>> > Date: Monday, December 11, 2023 at 6:35 PM > To: [email protected] <mailto:[email protected]> <[email protected] > <mailto:[email protected]>> > Subject: {EXTERNAL} Re: Assistance Needed with Node Initialization and Role > Changes in Ratis Cluster > > Hi Mahesh, Thanks for exploring Ratis! Unfortunately the arithmetic example > does not support role changes currently ;( For membership change examples, > please refer to example/membership in latest 3. 0 version. You can find the > relevant code > Hi Mahesh, > > Thanks for exploring Ratis! Unfortunately the arithmetic example does not > support role changes currently ;( > << With the help of Tsz, I created append.java(attached) and able to update > the Ratis node cluster >> > > For membership change examples, please refer to example/membership in latest > 3.0 version. You can find the relevant code here > https://urldefense.com/v3/__https://github.com/apache/ratis/blob/53831534c69309688ce379006363e645bf42b654/ratis-examples/src/main/java/org/apache/ratis/examples/membership/server/RaftCluster.java*L68__;Iw!!NDdRaFrjhKsg!r-vVzYJp-wYyEcDzkCI8HX2lf84hLyO_WLw18MT2GtsI4AIxn1_ERJXhwurxqnJ_qqYfAfUo6g83HTToeRwjV7406O0$ > > <https://urldefense.com/v3/__https:/github.com/apache/ratis/blob/53831534c69309688ce379006363e645bf42b654/ratis-examples/src/main/java/org/apache/ratis/examples/membership/server/RaftCluster.java*L68__;Iw!!NDdRaFrjhKsg!r-vVzYJp-wYyEcDzkCI8HX2lf84hLyO_WLw18MT2GtsI4AIxn1_ERJXhwurxqnJ_qqYfAfUo6g83HTToeRwjV7406O0$> > > When changing from (n0, n1, n2) to (n0, n1, n3), you can follow these steps > 1. Start n3 with an EMPTY group configuration. > 2. Send a setConfiguration([n0, n1, n3]) request to the existing group. > 3. Once 2 is executed successfully, you can now safely shutdown n2 and clean > up the data. > > << > In-fact , I tried this approach, but it didn’t worked as excepted > > Started 3 nodes n0,n1, n2 with the following commands > PEERS=n0:127.0.0.1:6000,n1:127.0.0.1:6001,n2:127.0.0.1:6002 > ID=n0; ${BIN}/server.sh arithmetic server --id ${ID} --storage > /tmp/ratis/${ID} --peers ${PEERS} > ID=n1; ${BIN}/server.sh arithmetic server --id ${ID} --storage > /tmp/ratis/${ID} --peers ${PEERS} > ID=n2; ${BIN}/server.sh arithmetic server --id ${ID} --storage > /tmp/ratis/${ID} --peers ${PEERS} > Started n3 node with the following command ID=n3; ${BIN}/server.sh arithmetic > server --id ${ID} --storage /tmp/ratis/${ID} --peers n3:127.0.0.1:6003 > setConfiguration as follows but it is failed (attached append-n3.txt file for > logs) > PEERS=n0:127.0.0.1:6000,n1:127.0.0.1:6001,n2:127.0.0.1:6002 > OLDPEERS=n0:127.0.0.1:6000,n1:127.0.0.1:6001,n2:127.0.0.1:6002,n3:127.0.0.1:6003 > {BIN}/client.sh arithmetic append --peers ${PEERS} --oldPeers ${OLDPEERS} > > >> > > In arithmetic example, n3 is started with the intended new group(n0, n1, n3) > but Step 2 is not executed. Without this, the original group (n0, n1, n2) > remains unaware of the new configuration and continues to operate under the > assumption that the group consists of (n0, n1, n2). This lead to n3 being > rejected and shutdown. > > Best Regards, > William > > > > 2023年12月12日 04:54，Mahesh Garlapati > > <[email protected]> 写道： > > > > Hello team, > > > > I initiated three nodes, namely n0, n1, and n2, using the following > > commands: > > > > ID=n0; ${BIN}/server.sh arithmetic server --id ${ID} --storage > > /tmp/ratis/${ID} --peers ${PEERS} > > ID=n1; ${BIN}/server.sh arithmetic server --id ${ID} --storage > > /tmp/ratis/${ID} --peers ${PEERS} > > ID=n2; ${BIN}/server.sh arithmetic server --id ${ID} --storage > > /tmp/ratis/${ID} --peers ${PEERS} > > > > Based on the logs, it appears that n2 is the leader: > > > > INFO StateMachine:166 - LEADER:n2-1: a = 10 = 10 > > > > However, when I attempted to stop the n2 node (leader) and start a new > > node, n3, with peers n0, n1, and n3, the n3 server failed to start. > > Attached are the log files for review. > > > > I am seeking assistance in understanding the reason for this error > > preventing the successful start of the n3 node. > > > > In another scenario: > > > > I started three nodes, n0, n1, and n2, using similar commands, and logs > > indicated that n1 was the leader: > > > > INFO StateMachine:166 - LEADER:n1-1: a = 10 = 10 > > > > Upon stopping the non-leader node, n2, I attempted to start a new node, n3, > > with peers n0, n1, and n3. The n3 server started but generated errors such > > as: > > > > 2023-12-11 12:43:13 INFO RaftServer$Division:377 - n3@group-6F7570313233: > > changes role from CANDIDATE to FOLLOWER at term 1 for REJECTED > > > > These errors were resolved by running the append command using the admin > > client. > > > > I appreciate your assistance in resolving this issues. > > > > Thanks, > > Mahesh Reddy > > > > CONFIDENTIALITY NOTICE This e-mail message and any attachments are only for > > the use of the intended recipient and may contain information that is > > privileged, confidential or exempt from disclosure under applicable law. If > > you are not the intended recipient, any disclosure, distribution or other > > use of this e-mail message or attachments is prohibited. If you have > > received this e-mail message in error, please delete and notify the sender > > immediately. Thank you. <log.txt> > > <append-n3.txt>
