[
https://issues.apache.org/jira/browse/KAFKA-2052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Alex Jiao Ziheng updated KAFKA-2052:
------------------------------------
Description:
I wish to specify multiple zk nodes with chroot strings in server.properties
config file but Kafka is unable to separate the zk nodes properly in the
presence of chroot strings:
{code:title=server.properties|borderStyle=solid}
zookeeper.connect=zookeeper-staging-a-1.bezurk.org:2181/kafka,zookeeper-staging-b-1.bezurk.org:2181/kafka
{code}
Error logs:
{code:title=kafka_init_stdout.log|borderStyle=solid}
[2015-03-26 13:58:21,330] INFO [Kafka Server 1], Connecting to zookeeper on
zookeeper-staging-b-1.bezurk.org:2181/kafka,zookeeper-staging-a-1.bezurk.org:2181/kafka
(kafka.server.KafkaServer)
[2015-03-26 13:58:21,438] INFO Starting ZkClient event thread.
(org.I0Itec.zkclient.ZkEventThread)
[2015-03-26 13:58:21,454] INFO Client
environment:zookeeper.version=3.3.3-1203054, built on 11/17/2011 05:47 GMT
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client
environment:host.name=ip-10-0-11-38.ap-southeast-1.compute.internal
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client environment:java.version=1.7.0_75
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client environment:java.vendor=Oracle
Corporation (org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client
environment:java.home=/usr/lib/jvm/jdk1.7.0_75/jre
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client
environment:java.class.path=:/opt/kafka/bin/../core/build/dependant-libs-2.8.0/*.jar:/opt/kafka/bin/../perf/build/libs//kafka-perf_2.8.0*.jar:/opt/kafka/bin/../clients/build/libs//kafka-clients*.jar:/opt/kafka/bin/../examples/build/libs//kafka-examples*.jar:/opt/kafka/bin/../contrib/hadoop-consumer/build/libs//kafka-hadoop-consumer*.jar:/opt/kafka/bin/../contrib/hadoop-producer/build/libs//kafka-hadoop-producer*.jar:/opt/kafka/bin/../libs/jopt-simple-3.2.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-javadoc.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-scaladoc.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-sources.jar:/opt/kafka/bin/../libs/log4j-1.2.15.jar:/opt/kafka/bin/../libs/metrics-core-2.2.0.jar:/opt/kafka/bin/../libs/scala-library-2.9.2.jar:/opt/kafka/bin/../libs/slf4j-api-1.7.2.jar:/opt/kafka/bin/../libs/snappy-java-1.0.5.jar:/opt/kafka/bin/../libs/zkclient-0.3.jar:/opt/kafka/bin/../libs/zookeeper-3.3.4.jar:/opt/kafka/bin/../core/build/libs/kafka_2.8.0*.jar
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client
environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:java.io.tmpdir=/tmp
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:java.compiler=<NA>
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:os.name=Linux
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:os.arch=amd64
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:os.version=3.2.0-58-virtual
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:user.name=kafka
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:user.home=/home/kafka
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:user.dir=/home/kafka
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,457] INFO Initiating client connection,
connectString=zookeeper-staging-b-1.bezurk.org:2181/kafka,zookeeper-staging-a-1.bezurk.org:2181/kafka
sessionTimeout=6000 watcher=org.I0Itec.zkclient.ZkClient@1111c0d7
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,564] INFO Opening socket connection to server
zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181
(org.apache.zookeeper.ClientCnxn)
[2015-03-26 13:58:21,578] INFO Socket connection established to
zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181, initiating session
(org.apache.zookeeper.ClientCnxn)
[2015-03-26 13:58:21,596] INFO Session establishment complete on server
zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181, sessionid =
0x24c50668a78000d, negotiated timeout = 6000 (org.apache.zookeeper.ClientCnxn)
[2015-03-26 13:58:21,604] INFO zookeeper state changed (SyncConnected)
(org.I0Itec.zkclient.ZkClient)
{code}
{code:title=server.log|borderStyle=solid}
2015-03-26 13:58:21,750 FATAL kafka.server.KafkaServerStartable: Fatal error
during KafkaServerStable startup. Prepare to shutdown
java.lang.IllegalArgumentException: Path length must be > 0
at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:48)
at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:35)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:626)
at org.I0Itec.zkclient.ZkConnection.create(ZkConnection.java:87)
at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:308)
at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:304)
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
at org.I0Itec.zkclient.ZkClient.create(ZkClient.java:304)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:213)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
at kafka.utils.ZkUtils$.makeSurePersistentPathExists(ZkUtils.scala:236)
at
kafka.utils.ZkUtils$$anonfun$setupCommonPaths$1.apply(ZkUtils.scala:105)
at
kafka.utils.ZkUtils$$anonfun$setupCommonPaths$1.apply(ZkUtils.scala:104)
at
scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:76)
at kafka.utils.ZkUtils$.setupCommonPaths(ZkUtils.scala:104)
at kafka.server.KafkaServer.initZk(KafkaServer.scala:114)
at kafka.server.KafkaServer.startup(KafkaServer.scala:69)
at
kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:34)
at kafka.Kafka$.main(Kafka.scala:46)
at kafka.Kafka.main(Kafka.scala)
{code}
And I also have a question (if it's apt to ask here). If I don't specify chroot
strings when defining multiple zk nodes (that works), will zookeeper
automatically create a namespace for kafka?
was:
I wish to specify multiple zk nodes with chroot strings in server.properties
config file but Kafka is unable to separate the zk nodes properly in the
presence of chroot strings:
{code:title=server.properties|borderStyle=solid}
zookeeper.connect=zookeeper-staging-a-1.bezurk.org:2181/kafka,zookeeper-staging-b-1.bezurk.org:2181/kafka
{code}
Error logs:
==> kafka_init_stdout.log <==
[2015-03-26 13:58:21,330] INFO [Kafka Server 1], Connecting to zookeeper on
zookeeper-staging-b-1.bezurk.org:2181/kafka,zookeeper-staging-a-1.bezurk.org:2181/kafka
(kafka.server.KafkaServer)
[2015-03-26 13:58:21,438] INFO Starting ZkClient event thread.
(org.I0Itec.zkclient.ZkEventThread)
[2015-03-26 13:58:21,454] INFO Client
environment:zookeeper.version=3.3.3-1203054, built on 11/17/2011 05:47 GMT
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client
environment:host.name=ip-10-0-11-38.ap-southeast-1.compute.internal
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client environment:java.version=1.7.0_75
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client environment:java.vendor=Oracle
Corporation (org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,454] INFO Client
environment:java.home=/usr/lib/jvm/jdk1.7.0_75/jre
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client
environment:java.class.path=:/opt/kafka/bin/../core/build/dependant-libs-2.8.0/*.jar:/opt/kafka/bin/../perf/build/libs//kafka-perf_2.8.0*.jar:/opt/kafka/bin/../clients/build/libs//kafka-clients*.jar:/opt/kafka/bin/../examples/build/libs//kafka-examples*.jar:/opt/kafka/bin/../contrib/hadoop-consumer/build/libs//kafka-hadoop-consumer*.jar:/opt/kafka/bin/../contrib/hadoop-producer/build/libs//kafka-hadoop-producer*.jar:/opt/kafka/bin/../libs/jopt-simple-3.2.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-javadoc.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-scaladoc.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-sources.jar:/opt/kafka/bin/../libs/log4j-1.2.15.jar:/opt/kafka/bin/../libs/metrics-core-2.2.0.jar:/opt/kafka/bin/../libs/scala-library-2.9.2.jar:/opt/kafka/bin/../libs/slf4j-api-1.7.2.jar:/opt/kafka/bin/../libs/snappy-java-1.0.5.jar:/opt/kafka/bin/../libs/zkclient-0.3.jar:/opt/kafka/bin/../libs/zookeeper-3.3.4.jar:/opt/kafka/bin/../core/build/libs/kafka_2.8.0*.jar
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client
environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:java.io.tmpdir=/tmp
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:java.compiler=<NA>
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:os.name=Linux
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,455] INFO Client environment:os.arch=amd64
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:os.version=3.2.0-58-virtual
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:user.name=kafka
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:user.home=/home/kafka
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,456] INFO Client environment:user.dir=/home/kafka
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,457] INFO Initiating client connection,
connectString=zookeeper-staging-b-1.bezurk.org:2181/kafka,zookeeper-staging-a-1.bezurk.org:2181/kafka
sessionTimeout=6000 watcher=org.I0Itec.zkclient.ZkClient@1111c0d7
(org.apache.zookeeper.ZooKeeper)
[2015-03-26 13:58:21,564] INFO Opening socket connection to server
zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181
(org.apache.zookeeper.ClientCnxn)
[2015-03-26 13:58:21,578] INFO Socket connection established to
zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181, initiating session
(org.apache.zookeeper.ClientCnxn)
[2015-03-26 13:58:21,596] INFO Session establishment complete on server
zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181, sessionid =
0x24c50668a78000d, negotiated timeout = 6000 (org.apache.zookeeper.ClientCnxn)
[2015-03-26 13:58:21,604] INFO zookeeper state changed (SyncConnected)
(org.I0Itec.zkclient.ZkClient)
==> server.log <==
2015-03-26 13:58:21,750 FATAL kafka.server.KafkaServerStartable: Fatal error
during KafkaServerStable startup. Prepare to shutdown
java.lang.IllegalArgumentException: Path length must be > 0
at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:48)
at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:35)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:626)
at org.I0Itec.zkclient.ZkConnection.create(ZkConnection.java:87)
at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:308)
at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:304)
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
at org.I0Itec.zkclient.ZkClient.create(ZkClient.java:304)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:213)
at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
at kafka.utils.ZkUtils$.makeSurePersistentPathExists(ZkUtils.scala:236)
at
kafka.utils.ZkUtils$$anonfun$setupCommonPaths$1.apply(ZkUtils.scala:105)
at
kafka.utils.ZkUtils$$anonfun$setupCommonPaths$1.apply(ZkUtils.scala:104)
at
scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:76)
at kafka.utils.ZkUtils$.setupCommonPaths(ZkUtils.scala:104)
at kafka.server.KafkaServer.initZk(KafkaServer.scala:114)
at kafka.server.KafkaServer.startup(KafkaServer.scala:69)
at
kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:34)
at kafka.Kafka$.main(Kafka.scala:46)
at kafka.Kafka.main(Kafka.scala)
> zookeeper.connect does not work when specifying multiple zk nodes with chroot
> ------------------------------------------------------------------------------
>
> Key: KAFKA-2052
> URL: https://issues.apache.org/jira/browse/KAFKA-2052
> Project: Kafka
> Issue Type: Bug
> Components: config
> Reporter: Alex Jiao Ziheng
> Priority: Minor
>
> I wish to specify multiple zk nodes with chroot strings in server.properties
> config file but Kafka is unable to separate the zk nodes properly in the
> presence of chroot strings:
> {code:title=server.properties|borderStyle=solid}
> zookeeper.connect=zookeeper-staging-a-1.bezurk.org:2181/kafka,zookeeper-staging-b-1.bezurk.org:2181/kafka
> {code}
> Error logs:
> {code:title=kafka_init_stdout.log|borderStyle=solid}
> [2015-03-26 13:58:21,330] INFO [Kafka Server 1], Connecting to zookeeper on
> zookeeper-staging-b-1.bezurk.org:2181/kafka,zookeeper-staging-a-1.bezurk.org:2181/kafka
> (kafka.server.KafkaServer)
> [2015-03-26 13:58:21,438] INFO Starting ZkClient event thread.
> (org.I0Itec.zkclient.ZkEventThread)
> [2015-03-26 13:58:21,454] INFO Client
> environment:zookeeper.version=3.3.3-1203054, built on 11/17/2011 05:47 GMT
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,454] INFO Client
> environment:host.name=ip-10-0-11-38.ap-southeast-1.compute.internal
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,454] INFO Client environment:java.version=1.7.0_75
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,454] INFO Client environment:java.vendor=Oracle
> Corporation (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,454] INFO Client
> environment:java.home=/usr/lib/jvm/jdk1.7.0_75/jre
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,455] INFO Client
> environment:java.class.path=:/opt/kafka/bin/../core/build/dependant-libs-2.8.0/*.jar:/opt/kafka/bin/../perf/build/libs//kafka-perf_2.8.0*.jar:/opt/kafka/bin/../clients/build/libs//kafka-clients*.jar:/opt/kafka/bin/../examples/build/libs//kafka-examples*.jar:/opt/kafka/bin/../contrib/hadoop-consumer/build/libs//kafka-hadoop-consumer*.jar:/opt/kafka/bin/../contrib/hadoop-producer/build/libs//kafka-hadoop-producer*.jar:/opt/kafka/bin/../libs/jopt-simple-3.2.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-javadoc.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-scaladoc.jar:/opt/kafka/bin/../libs/kafka_2.9.2-0.8.1.1-sources.jar:/opt/kafka/bin/../libs/log4j-1.2.15.jar:/opt/kafka/bin/../libs/metrics-core-2.2.0.jar:/opt/kafka/bin/../libs/scala-library-2.9.2.jar:/opt/kafka/bin/../libs/slf4j-api-1.7.2.jar:/opt/kafka/bin/../libs/snappy-java-1.0.5.jar:/opt/kafka/bin/../libs/zkclient-0.3.jar:/opt/kafka/bin/../libs/zookeeper-3.3.4.jar:/opt/kafka/bin/../core/build/libs/kafka_2.8.0*.jar
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,455] INFO Client
> environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,455] INFO Client environment:java.io.tmpdir=/tmp
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,455] INFO Client environment:java.compiler=<NA>
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,455] INFO Client environment:os.name=Linux
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,455] INFO Client environment:os.arch=amd64
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,456] INFO Client environment:os.version=3.2.0-58-virtual
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,456] INFO Client environment:user.name=kafka
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,456] INFO Client environment:user.home=/home/kafka
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,456] INFO Client environment:user.dir=/home/kafka
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,457] INFO Initiating client connection,
> connectString=zookeeper-staging-b-1.bezurk.org:2181/kafka,zookeeper-staging-a-1.bezurk.org:2181/kafka
> sessionTimeout=6000 watcher=org.I0Itec.zkclient.ZkClient@1111c0d7
> (org.apache.zookeeper.ZooKeeper)
> [2015-03-26 13:58:21,564] INFO Opening socket connection to server
> zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181
> (org.apache.zookeeper.ClientCnxn)
> [2015-03-26 13:58:21,578] INFO Socket connection established to
> zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181, initiating session
> (org.apache.zookeeper.ClientCnxn)
> [2015-03-26 13:58:21,596] INFO Session establishment complete on server
> zookeeper-staging-b-1.bezurk.org/10.0.29.191:2181, sessionid =
> 0x24c50668a78000d, negotiated timeout = 6000 (org.apache.zookeeper.ClientCnxn)
> [2015-03-26 13:58:21,604] INFO zookeeper state changed (SyncConnected)
> (org.I0Itec.zkclient.ZkClient)
> {code}
> {code:title=server.log|borderStyle=solid}
> 2015-03-26 13:58:21,750 FATAL kafka.server.KafkaServerStartable: Fatal error
> during KafkaServerStable startup. Prepare to shutdown
> java.lang.IllegalArgumentException: Path length must be > 0
> at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:48)
> at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:35)
> at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:626)
> at org.I0Itec.zkclient.ZkConnection.create(ZkConnection.java:87)
> at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:308)
> at org.I0Itec.zkclient.ZkClient$1.call(ZkClient.java:304)
> at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
> at org.I0Itec.zkclient.ZkClient.create(ZkClient.java:304)
> at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:213)
> at org.I0Itec.zkclient.ZkClient.createPersistent(ZkClient.java:223)
> at kafka.utils.ZkUtils$.makeSurePersistentPathExists(ZkUtils.scala:236)
> at
> kafka.utils.ZkUtils$$anonfun$setupCommonPaths$1.apply(ZkUtils.scala:105)
> at
> kafka.utils.ZkUtils$$anonfun$setupCommonPaths$1.apply(ZkUtils.scala:104)
> at
> scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
> at scala.collection.immutable.List.foreach(List.scala:76)
> at kafka.utils.ZkUtils$.setupCommonPaths(ZkUtils.scala:104)
> at kafka.server.KafkaServer.initZk(KafkaServer.scala:114)
> at kafka.server.KafkaServer.startup(KafkaServer.scala:69)
> at
> kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:34)
> at kafka.Kafka$.main(Kafka.scala:46)
> at kafka.Kafka.main(Kafka.scala)
> {code}
> And I also have a question (if it's apt to ask here). If I don't specify
> chroot strings when defining multiple zk nodes (that works), will zookeeper
> automatically create a namespace for kafka?
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