Thank you for the update steps!I've successfully expanded my zookeeper。But 
what should I do with Kafka clusters that can't connect to zookeeper,Now the 
Kafka cluster can work normally, but it cannot be operated。
    Thanks for your help!!

________________________________
发件人: manoj.agraw...@cognizant.com <manoj.agraw...@cognizant.com>
发送时间: 2020年8月30日 11:03
收件人: users@kafka.apache.org <users@kafka.apache.org>
主题: Re: 回复: Kafka cluster cannot connect to zookeeper

Try below

    1. Update conf/ zoo.cfg Configure the configuration of  exiting one and new 
one. server nodes

    2. Add myid under dataDir

    3. Restart the existing zookeeper node

    4. Start the other one  zookeeper nodes
    5. Update conf/ zoo.cfg Configure the configuration of existing  (2  
zookeeper) and   new one server nodes

    6. Add myid under dataDir

    7. Restart the existing zookeeper node

    8. Start the other one  zookeeper nodes





On 8/29/20, 3:52 AM, "Li,Dingqun" <liding...@agora.io> wrote:

    [External]


    I updated zookeeper's process

    1. Update conf/ zoo.cfg Configure the configuration of two new server nodes

    2. Add myid under dataDir

    3. Restart the existing zookeeper node

    4. Start the other two zookeeper nodes

    5. The existing zookeeper node is changed from stand-alone to leader

    zookeeper version 3.4.14-4
    kafka version 2.3.0

    This is part of the log:
    [2020-08-28 08:43:23,872] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0x5 zxid:0x2000005e0 
txnt    ype:-1 reqpath:n/a Error Path:/brokers/topics Error:KeeperErrorCode = 
NodeExists for /brokers/topics (org.apache.zookeeper.server.PrepRequestProcesso 
   r)
    181 [2020-08-28 08:43:23,945] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0x6 zxid:0x2000005e1 
txnt    ype:-1 reqpath:n/a Error Path:/config/changes Error:KeeperErrorCode = 
NodeExists for /config/changes (org.apache.zookeeper.server.PrepRequestProcesso 
   r)
    182 [2020-08-28 08:43:24,018] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0x7 zxid:0x2000005e2 
txnt    ype:-1 reqpath:n/a Error Path:/admin/delete_topics 
Error:KeeperErrorCode = NodeExists for /admin/delete_topics 
(org.apache.zookeeper.server.PrepReque    stProcessor)
    183 [2020-08-28 08:43:24,092] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0x8 zxid:0x2000005e3 
txnt    ype:-1 reqpath:n/a Error Path:/brokers/seqid Error:KeeperErrorCode = 
NodeExists for /brokers/seqid (org.apache.zookeeper.server.PrepRequestProcessor)
    184 [2020-08-28 08:43:24,166] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0x9 zxid:0x2000005e4 
txnt    ype:-1 reqpath:n/a Error Path:/isr_change_notification 
Error:KeeperErrorCode = NodeExists for /isr_change_notification 
(org.apache.zookeeper.server.P    repRequestProcessor)
    185 [2020-08-28 08:43:24,240] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0xa zxid:0x2000005e5 
txnt    ype:-1 reqpath:n/a Error Path:/latest_producer_id_block 
Error:KeeperErrorCode = NodeExists for /latest_producer_id_block 
(org.apache.zookeeper.server    .PrepRequestProcessor)
    186 [2020-08-28 08:43:24,313] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0xb zxid:0x2000005e6 
txnt    ype:-1 reqpath:n/a Error Path:/log_dir_event_notification 
Error:KeeperErrorCode = NodeExists for /log_dir_event_notification 
(org.apache.zookeeper.se    rver.PrepRequestProcessor)
    187 [2020-08-28 08:43:24,388] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0xc zxid:0x2000005e7 
txnt    ype:-1 reqpath:n/a Error Path:/config/topics Error:KeeperErrorCode = 
NodeExists for /config/topics (org.apache.zookeeper.server.PrepRequestProcessor)
    188 [2020-08-28 08:43:24,461] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0xd zxid:0x2000005e8 
txnt    ype:-1 reqpath:n/a Error Path:/config/clients Error:KeeperErrorCode = 
NodeExists for /config/clients (org.apache.zookeeper.server.PrepRequestProcesso 
   r)
    189 [2020-08-28 08:43:24,534] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0xe zxid:0x2000005e9 
txnt    ype:-1 reqpath:n/a Error Path:/config/users Error:KeeperErrorCode = 
NodeExists for /config/users (org.apache.zookeeper.server.PrepRequestProcessor)
    190 [2020-08-28 08:43:24,607] INFO Got user-level KeeperException when 
processing sessionid:0x7d0679e7c0a90004 type:create cxid:0xf zxid:0x2000005ea 
txnt    ype:-1 reqpath:n/a Error Path:/config/brokers Error:KeeperErrorCode = 
NodeExists for /config/brokers (org.apache.zookeeper.server.PrepRequestProcesso 
   r)
    191 [2020-08-28 08:45:03,991] WARN Connection broken for id 74, my id = 
185, error =  (org.apache.zookeeper.server.quorum.QuorumCnxManager)
    192 java.io.EOFException
    193         at java.io.DataInputStream.readInt(DataInputStream.java:392)
    194         at 
org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:1010)
    195 [2020-08-28 08:45:03,991] WARN Interrupting SendWorker 
(org.apache.zookeeper.server.quorum.QuorumCnxManager)
    196 [2020-08-28 08:45:03,991] WARN Interrupted while waiting for message on 
queue (org.apache.zookeeper.server.quorum.QuorumCnxManager)
    197 java.lang.InterruptedException
    198         at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2014)

    Thanks for your help!
    ________________________________
    发件人: manoj.agraw...@cognizant.com <manoj.agraw...@cognizant.com>
    发送时间: 2020年8月29日 0:01
    收件人: users@kafka.apache.org <users@kafka.apache.org>
    主题: Re: Kafka cluster cannot connect to zookeeper

    You have'nt describe how you are adding zookeeper .
    Right way to add zookeeper

    One host at a time
    1. update the existing zookeeper node conf/zoo.cfg  by adding  new host
    2. restart the zk process on existing host
    3. start the zk process in new node

    On 8/28/20, 8:20 AM, "Li,Dingqun" <liding...@agora.io> wrote:

        [External]


        We have one zookeeper node and two Kafka nodes. After that, we expand 
the capacity of zookeeper: change the configuration of zookeeper node, restart 
it, and add two zookeeper nodes. After that, my Kafka cluster could not connect 
to the zookeeper cluster, and there was no information available in the log.

        What should we do? Thank you


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