Zookeeper 3.8.4 not logging

Alf015 — Thu, 06 Jun 2024 11:37:46 GMT

Hello

I'm running apache zookeeper 3.8.4.
File zookeeper.log does not get created.
Log files are empty except the following message:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
SLF4J: Failed to load class "org.slf4j.impl.StaticMDCBinder".
SLF4J: Defaulting to no-operation MDCAdapter implementation.
SLF4J: See http://www.slf4j.org/codes.html#no_static_mdc_binder for further details.

How can I configure zookeeper with logs working ?

According to the links, this is due to slf4j not detecting logback.

The process runs with the following options in the commandline (extract)
The classpath does seem to include slf4j and logback jars,
as well as the conf directory containing logback.xml

/apps/dis/java/jdk/bin/java
-Dzookeeper.log.dir=/apps/zookeeper/log
-Dzookeeper.log.file=zookeeper.log
-cp
...
/apps/zookeeper/bin/zkcurrent/bin/../lib/slf4j-api-1.7.30.jar:
...
/apps/zookeeper/bin/zkcurrent/bin/../lib/logback-core-1.2.13.jar:
...
/apps/zookeeper/bin/zkcurrent/bin/../lib/logback-classic-1.2.13.jar:
/apps/zookeeper/bin/zkcurrent/bin/../conf:
...
org.apache.zookeeper.server.quorum.QuorumPeerMain
/apps/zookeeper/bin/zkcurrent/bin/../conf/zoo.cfg

The logback.xml file is in
/apps/zookeeper/bin/zkcurrent/bin/../conf
with rollingfile and console appenders activated:

<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{ISO8601} [myid:%X{myid}] - %-5p [%t:%C{1}@%L] - %m%n</pattern>
</encoder>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>${zookeeper.console.threshold}</level>
</filter>
</appender>

...
<appender name="ROLLINGFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${zookeeper.log.dir}/${zookeeper.log.file}</File>
<encoder>
<pattern>%d{ISO8601} [myid:%X{myid}] - %-5p [%t:%C{1}@%L] - %m%n</pattern>
</encoder>
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<level>${zookeeper.log.threshold}</level>
</filter>
<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<maxIndex>${zookeeper.log.maxbackupindex}</maxIndex>
<FileNamePattern>${zookeeper.log.dir}/${zookeeper.log.file}.%i</FileNamePattern>
</rollingPolicy>
<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<MaxFileSize>${zookeeper.log.maxfilesize}</MaxFileSize>
</triggeringPolicy>
</appender>

...

<root level="INFO">
<appender-ref ref="CONSOLE" />
<appender-ref ref="ROLLINGFILE" />
</root>

All suggestions welcome.

Regards

Re: Zookeeper 3.8.4 not logging

Shelton — Fri, 02 Aug 2024 14:56:09 GMT

@Alf015
Can you share in what context standalone? Package with HDP or CDP etc. This will give a better understanding on maybe how to replicate your environment and enable us to help resolve your issue.

Thank you

Re: Zookeeper 3.8.4 not logging

amd0629 — Thu, 09 Jan 2025 11:09:08 GMT

ZK 3.8.4 uses the LogBack feature for logging, which uses 2 libraries

logback-core-1.2.13.jar
logback-classic-1.2.13.jar ( Missing Jar )

one of them was missing from my bundle. I downloaded and copied the jar in zookeeper/lib/ dir and restarted the service. This worked for me.
Steps -

Locate the logback jar, download the other missing jar, and paste in that dir.

cd /opt/
wget https://repo1.maven.org/maven2/ch/qos/logback/logback-classic/1.2.13/logback-classic-1.2.13.jar
cksum logback-classic-1.2.13.jar | grep -i "103870831 232073"
chown root:root logback-classic-1.2.13.jar
cp logback-classic-1.2.13.jar /usr/odp/3.3.6.0-1/zookeeper/lib/
cp logback-classic-1.2.13.jar /usr/odp/3.3.6.0-1/cruise-control3/dependant-libs/

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Zookeeper 3.8.4 not logging

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Re: Zookeeper 3.8.4 not logging