In case it is informative, here is the output from running zookeeper 3.8.0
in my latest test run with NullMetricsProvider.
~/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin$ ./zkServer.sh
start-foreground
/usr/bin/java
ZooKeeper JMX enabled by default
Using config:
/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
2022-08-28 21:36:13,846 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@177]
- Reading configuration from:
/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
2022-08-28 21:36:13,850 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@440]
- clientPortAddress is 0.0.0.0:2181
2022-08-28 21:36:13,851 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@444]
- secureClientPort is not set
2022-08-28 21:36:13,851 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@460]
- observerMasterPort is not set
2022-08-28 21:36:13,851 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@477]
- metricsProvider.className is
org.apache.zookeeper.metrics.impl.NullMetricsProvider
2022-08-28 21:36:13,852 [myid:] - INFO
[main:o.a.z.s.DatadirCleanupManager@78] - autopurge.snapRetainCount set to
3
2022-08-28 21:36:13,852 [myid:] - INFO
[main:o.a.z.s.DatadirCleanupManager@79] - autopurge.purgeInterval set to 0
2022-08-28 21:36:13,852 [myid:] - INFO
[main:o.a.z.s.DatadirCleanupManager@101] - Purge task is not scheduled.
2022-08-28 21:36:13,852 [myid:] - WARN [main:o.a.z.s.q.QuorumPeerMain@139]
- Either no config or no quorum defined in config, running in standalone
mode
2022-08-28 21:36:13,853 [myid:] - INFO [main:o.a.z.j.ManagedUtil@46] -
Log4j 1.2 jmx support not found; jmx disabled.
2022-08-28 21:36:13,853 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@177]
- Reading configuration from:
/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../conf/zoo.cfg
2022-08-28 21:36:13,854 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@440]
- clientPortAddress is 0.0.0.0:2181
2022-08-28 21:36:13,854 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@444]
- secureClientPort is not set
2022-08-28 21:36:13,854 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@460]
- observerMasterPort is not set
2022-08-28 21:36:13,854 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@477]
- metricsProvider.className is
org.apache.zookeeper.metrics.impl.NullMetricsProvider
2022-08-28 21:36:13,854 [myid:] - INFO
[main:o.a.z.s.ZooKeeperServerMain@123] - Starting server
2022-08-28 21:36:13,861 [myid:] - INFO [main:o.a.z.s.ServerMetrics@64] -
ServerMetrics initialized with provider
org.apache.zookeeper.metrics.impl.NullMetricsProvider@4d5d943d
2022-08-28 21:36:13,862 [myid:] - INFO
[main:o.a.z.s.a.DigestAuthenticationProvider@47] - ACL digest algorithm
is: SHA1
2022-08-28 21:36:13,862 [myid:] - INFO
[main:o.a.z.s.a.DigestAuthenticationProvider@61] -
zookeeper.DigestAuthenticationProvider.enabled = true
2022-08-28 21:36:13,863 [myid:] - INFO [main:o.a.z.s.p.FileTxnSnapLog@124]
- zookeeper.snapshot.trust.empty : false
2022-08-28 21:36:13,869 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
2022-08-28 21:36:13,869 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
______ _
2022-08-28 21:36:13,869 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
|___ / | |
2022-08-28 21:36:13,869 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
/ / ___ ___ | | __ ___ ___ _ __ ___ _ __
2022-08-28 21:36:13,869 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
/ / / _ \ / _ \ | |/ / / _ \ / _ \ | '_ \ / _ \ | '__|
2022-08-28 21:36:13,869 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
/ /__ | (_) | | (_) | | < | __/ | __/ | |_) | | __/ | |
2022-08-28 21:36:13,870 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
/_____| \___/ \___/ |_|\_\ \___| \___| | .__/ \___| |_|
2022-08-28 21:36:13,870 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
| |
2022-08-28 21:36:13,870 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
|_|
2022-08-28 21:36:13,870 [myid:] - INFO [main:o.a.z.ZookeeperBanner@42] -
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server
environment:zookeeper.version=3.8.0-5a02a05eddb59aee6ac762f7ea82e92a68eb9c0f,
built on 2022-02-25 08:49 UTC
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:host.name=host
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:java.version=11.0.16
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:java.vendor=Ubuntu
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:java.home=/usr/lib/jvm/java-11-openjdk-amd64
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server
environment:java.class.path=/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../zookeeper-server/target/classes:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../build/classes:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../zookeeper-server/target/lib/*.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../build/lib/*.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/zookeeper-prometheus-metrics-3.8.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/zookeeper-jute-3.8.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/zookeeper-3.8.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/snappy-java-1.1.7.7.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/slf4j-api-1.7.30.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/simpleclient_servlet-0.9.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/simpleclient_hotspot-0.9.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/simpleclient_common-0.9.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/simpleclient-0.9.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-transport-native-unix-common-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-transport-native-epoll-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-transport-classes-epoll-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-transport-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-tcnative-classes-2.0.48.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-tcnative-2.0.48.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-resolver-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-handler-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-common-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-codec-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/netty-buffer-4.1.73.Final.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/metrics-core-4.1.12.1.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/logback-core-1.2.10.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/logback-classic-1.2.10.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jline-2.14.6.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jetty-util-ajax-9.4.43.v20210629.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jetty-util-9.4.43.v20210629.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jetty-servlet-9.4.43.v20210629.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jetty-server-9.4.43.v20210629.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jetty-security-9.4.43.v20210629.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jetty-io-9.4.43.v20210629.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jetty-http-9.4.43.v20210629.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/javax.servlet-api-3.1.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jackson-databind-2.13.1.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jackson-core-2.13.1.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/jackson-annotations-2.13.1.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/commons-io-2.11.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/commons-cli-1.4.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../lib/audience-annotations-0.12.0.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../zookeeper-*.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../zookeeper-server/src/main/resources/lib/*.jar:/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin/../conf:
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server
environment:java.library.path=/usr/java/packages/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:java.io.tmpdir=/tmp
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:java.compiler=<NA>
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:os.name=Linux
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:os.arch=amd64
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:os.version=5.15.0-46-generic
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server
environment:user.dir=/home/will/servers/zookeeper/apache-zookeeper-3.8.0-bin/bin
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:os.memory.free=231MB
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:os.memory.max=1000MB
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.Environment@98] -
Server environment:os.memory.total=250MB
2022-08-28 21:36:13,871 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@140]
- zookeeper.enableEagerACLCheck = false
2022-08-28 21:36:13,872 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@153]
- zookeeper.digest.enabled = true
2022-08-28 21:36:13,872 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@157]
- zookeeper.closeSessionTxn.enabled = true
2022-08-28 21:36:13,872 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@1496]
- zookeeper.flushDelay = 0 ms
2022-08-28 21:36:13,872 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@1505]
- zookeeper.maxWriteQueuePollTime = 0 ms
2022-08-28 21:36:13,872 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@1514]
- zookeeper.maxBatchSize=1000
2022-08-28 21:36:13,872 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@264]
- zookeeper.intBufferStartingSizeBytes = 1024
2022-08-28 21:36:13,872 [myid:] - INFO [main:o.a.z.s.BlueThrottle@141] -
Weighed connection throttling is disabled
2022-08-28 21:36:13,873 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@1297]
- minSessionTimeout set to 4000 ms
2022-08-28 21:36:13,873 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@1306]
- maxSessionTimeout set to 40000 ms
2022-08-28 21:36:13,874 [myid:] - INFO [main:o.a.z.s.ResponseCache@45] -
getData response cache size is initialized with value 400.
2022-08-28 21:36:13,874 [myid:] - INFO [main:o.a.z.s.ResponseCache@45] -
getChildren response cache size is initialized with value 400.
2022-08-28 21:36:13,874 [myid:] - INFO
[main:o.a.z.s.u.RequestPathMetricsCollector@109] -
zookeeper.pathStats.slotCapacity = 60
2022-08-28 21:36:13,874 [myid:] - INFO
[main:o.a.z.s.u.RequestPathMetricsCollector@110] -
zookeeper.pathStats.slotDuration = 15
2022-08-28 21:36:13,875 [myid:] - INFO
[main:o.a.z.s.u.RequestPathMetricsCollector@111] -
zookeeper.pathStats.maxDepth = 6
2022-08-28 21:36:13,875 [myid:] - INFO
[main:o.a.z.s.u.RequestPathMetricsCollector@112] -
zookeeper.pathStats.initialDelay = 5
2022-08-28 21:36:13,875 [myid:] - INFO
[main:o.a.z.s.u.RequestPathMetricsCollector@113] -
zookeeper.pathStats.delay = 5
2022-08-28 21:36:13,875 [myid:] - INFO
[main:o.a.z.s.u.RequestPathMetricsCollector@114] -
zookeeper.pathStats.enabled = false
2022-08-28 21:36:13,876 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@1533]
- The max bytes for all large requests are set to 104857600
2022-08-28 21:36:13,876 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@1547]
- The large request threshold is set to -1
2022-08-28 21:36:13,877 [myid:] - INFO
[main:o.a.z.s.AuthenticationHelper@66] - zookeeper.enforce.auth.enabled =
false
2022-08-28 21:36:13,877 [myid:] - INFO
[main:o.a.z.s.AuthenticationHelper@67] - zookeeper.enforce.auth.schemes =
[]
2022-08-28 21:36:13,877 [myid:] - INFO [main:o.a.z.s.ZooKeeperServer@365]
- Created server with tickTime 2000 ms minSessionTimeout 4000 ms
maxSessionTimeout 40000 ms clientPortListenBacklog -1 datadir
/tmp/zookeeper/3.8.0/version-2 snapdir /tmp/zookeeper/3.8.0/version-2
2022-08-28 21:36:13,890 [myid:] - INFO [main:o.e.j.u.l.Log@170] - Logging
initialized @348ms to org.eclipse.jetty.util.log.Slf4jLog
2022-08-28 21:36:13,929 [myid:] - WARN [main:o.e.j.s.h.ContextHandler@1656]
- o.e.j.s.ServletContextHandler@3cebbb30{/,null,STOPPED} contextPath ends
with /*
2022-08-28 21:36:13,930 [myid:] - WARN [main:o.e.j.s.h.ContextHandler@1667]
- Empty contextPath
2022-08-28 21:36:13,951 [myid:] - INFO [main:o.e.j.s.Server@375] -
jetty-9.4.43.v20210629; built: 2021-06-30T11:07:22.254Z; git:
526006ecfa3af7f1a27ef3a288e2bef7ea9dd7e8; jvm
11.0.16+8-post-Ubuntu-0ubuntu120.04
2022-08-28 21:36:13,967 [myid:] - INFO
[main:o.e.j.s.s.DefaultSessionIdManager@334] - DefaultSessionIdManager
workerName=node0
2022-08-28 21:36:13,967 [myid:] - INFO
[main:o.e.j.s.s.DefaultSessionIdManager@339] - No SessionScavenger set,
using defaults
2022-08-28 21:36:13,968 [myid:] - INFO [main:o.e.j.s.s.HouseKeeper@132] -
node0 Scavenging every 600000ms
2022-08-28 21:36:13,970 [myid:] - WARN
[main:o.e.j.s.ConstraintSecurityHandler@759] -
[email protected]@3cebbb30{/,null,STARTING} has
uncovered http methods for path: /*
2022-08-28 21:36:13,975 [myid:] - INFO [main:o.e.j.s.h.ContextHandler@915]
- Started o.e.j.s.ServletContextHandler@3cebbb30{/,null,AVAILABLE}
2022-08-28 21:36:13,983 [myid:] - INFO [main:o.e.j.s.AbstractConnector@331]
- Started ServerConnector@29d89d5d{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
2022-08-28 21:36:13,983 [myid:] - INFO [main:o.e.j.s.Server@415] - Started
@441ms
2022-08-28 21:36:13,983 [myid:] - INFO [main:o.a.z.s.a.JettyAdminServer@196]
- Started AdminServer on address 0.0.0.0, port 8080 and command URL
/commands
2022-08-28 21:36:13,986 [myid:] - INFO [main:o.a.z.s.ServerCnxnFactory@169]
- Using org.apache.zookeeper.server.NIOServerCnxnFactory as server
connection factory
2022-08-28 21:36:13,987 [myid:] - WARN [main:o.a.z.s.ServerCnxnFactory@309]
- maxCnxns is not configured, using default value 0.
2022-08-28 21:36:13,988 [myid:] - INFO
[main:o.a.z.s.NIOServerCnxnFactory@652] - Configuring NIO connection
handler with 10s sessionless connection timeout, 2 selector thread(s), 24
worker threads, and 64 kB direct buffers.
2022-08-28 21:36:13,988 [myid:] - INFO
[main:o.a.z.s.NIOServerCnxnFactory@660] - binding to port
0.0.0.0/0.0.0.0:2181
2022-08-28 21:36:13,997 [myid:] - INFO
[main:o.a.z.s.w.WatchManagerFactory@42] - Using
org.apache.zookeeper.server.watch.WatchManager as watch manager
2022-08-28 21:36:13,997 [myid:] - INFO
[main:o.a.z.s.w.WatchManagerFactory@42] - Using
org.apache.zookeeper.server.watch.WatchManager as watch manager
2022-08-28 21:36:13,998 [myid:] - INFO [main:o.a.z.s.ZKDatabase@132] -
zookeeper.snapshotSizeFactor = 0.33
2022-08-28 21:36:13,998 [myid:] - INFO [main:o.a.z.s.ZKDatabase@152] -
zookeeper.commitLogCount=500
2022-08-28 21:36:14,002 [myid:] - INFO [main:o.a.z.s.p.SnapStream@61] -
zookeeper.snapshot.compression.method = CHECKED
Also here is my 3.8.0 zoo.cfg file:
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/tmp/zookeeper/3.8.0
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
#
https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1
## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpHost=0.0.0.0
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true
4lw.commands.whitelist=*
digest.enabled=true
metricsProvider.className=org.apache.zookeeper.metrics.impl.NullMetricsProvider
