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https://issues.apache.org/jira/browse/ZOOKEEPER-4530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529880#comment-17529880
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Anisha K J commented on ZOOKEEPER-4530:
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Yes, we have performed the operations using the operator. Below are the steps
to install operator and zookeeper cluster
{code:java}
helm repo add pravega https://charts.pravega.io
helm repo update
helm install zookeeper-operator pravega/zookeeper-operator
helm install zookeeper pravega/zookeeper --set
image.repository=kjanisha/zookeeper --set image.tag=3.8.0 {code}
After installation is completed, before doing scale down, if we login to
zookeeper-0 pod below entries can be seen
{code:java}
cat /data/conf/zoo.cfg
dynamicConfigFile=/data/conf/zoo.cfg.dynamic.500000011
cat /data/conf/zoo.cfg.dynamic.500000011
server.1=zookeeper-0.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
server.2=zookeeper-1.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
server.3=zookeeper-2.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
{code}
Now scale down the replicas to 1 using *kubectl edit zk zookeeper* and update
replica count to 1
wait for 2 pods to terminate
Again login to zookeeper pod and see the contents of dynamiConfigile, it is
still pointing to old config. It should have created a new dynamic config file
and updated the entry in zoo.cfg
{code:java}
cat /data/conf/zoo.cfg dynamicConfigFile=/data/conf/zoo.cfg.dynamic.500000011
cat /data/conf/zoo.cfg.dynamic.500000011
server.1=zookeeper-0.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
server.2=zookeeper-1.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
server.3=zookeeper-2.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
{code}
Please let us know if any further information is needed.
Note: Same operations works fine if we use zookeeper 3.6.3 and 3.7.0
> Dynamic config file is not updated while scaling down zookeeper replicas
> ------------------------------------------------------------------------
>
> Key: ZOOKEEPER-4530
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4530
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.8.0
> Reporter: Anisha K J
> Priority: Major
> Fix For: 3.8.0
>
>
> # create zk cluster with 3 replicas
> # kubectl edit zookeeopercluster , change replica to 1
> # we can see that pod count is 1
> # Loginto {{kubectl exec -it zookeeper-0 /bin/bash}} and see the contents of
> {{cat /data/conf/zoo.cfg}}
> {code:java}
> cat /data/conf/zoo.cfg
> metricsProvider.exportJvmInfo=true
> dataDir=/data
> 4lw.commands.whitelist=cons, envi, conf, crst, srvr, stat, mntr, ruok
> syncLimit=2
> commitLogCount=500
> metricsProvider.httpPort=7000
> snapSizeLimitInKb=4194304
> standaloneEnabled=false
> metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
> initLimit=10
> minSessionTimeout=4000
> snapCount=10000
> admin.serverPort=8080
> autopurge.purgeInterval=1
> maxSessionTimeout=40000
> maxCnxns=0
> globalOutstandingLimit=1000
> reconfigEnabled=true
> skipACL=yes
> autopurge.snapRetainCount=3
> tickTime=2000
> quorumListenOnAllIPs=false
> preAllocSize=16384
> maxClientCnxns=60
> dynamicConfigFile=/data/conf/zoo.cfg.dynamic.200000013 {code}
> 5. cat /data/conf/zoo.cfg.dynamic.200000013
> #
> {code:java}
> apache-zookeeper-3.8.0-bin# cat /data/conf/zoo.cfg.dynamic.200000013
> server.1=zookeeper-0.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
> server.2=zookeeper-1.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181
> server.3=zookeeper-2.zookeeper-headless.default.svc.cluster.local:2888:3888:participant;0.0.0.0:2181r
> {code}
> Issue: No new dynamic config file is created, and config file shows 3
> entries even if there is only one. Same issue is not seen with zookeeper
> 3.7.0 and 3.6.3
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