kafka启动报错（转）
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参考技术A 原文链接：https://blog.csdn.net/russle/java/article/details/84962568报错
C:\H\software\kafka_2.12-1.1.1\bin\windows>kafka-server-start.bat ..\..\config\
server.properties
[2018-12-11 21:13:46,490] INFO Registered kafka:type=kafka.Log4jController MBean
(kafka.utils.Log4jControllerRegistration$)
[2018-12-11 21:13:46,998] ERROR Exiting Kafka due to fatal exception (kafka.Kafk
a$)
java.lang.VerifyError: Uninitialized object exists on backward branch 209
Exception Details:
Location:
scala/collection/immutable/HashMap$HashTrieMap.split()Lscala/collection/immu
table/Seq; @249: goto
Reason:
Error exists in the bytecode
Bytecode:
0000000: 2ab6 0060 04a0 001e b200 b8b2 00bd 04bd
0000010: 0002 5903 2a53 c000 bfb6 00c3 b600 c7c0
......
0000170: b200 bd05 bd00 0259 0319 0b53 5904 190c
0000180: 53c0 00bf b600 c3b6 0102 b02a b600 3803
0000190: 32b6 0104 b0
Stackmap Table:
same_frame(@35)
full_frame(@141,Object[#2],Integer,Integer,Integer,Integer,Integer,Object[#
114],)
append_frame(@151,Object[#134],Object[#134])
full_frame(@209,Object[#2],Integer,Integer,Integer,Integer,Integer,Object[#
......
解决办法 升级jdk
将1.8.0_11 升级为 1.8.0_251
服务器上Kafka启动报错：error=‘Cannot allocate memory‘ (errno=12)
解决问题思路：大问题拆小问题。从源头（Kafka有无启动成功）开始测试，是在哪一步出了问题。
正面例子：从服务器上部署的项目的log_error.log中发现是Kafka出现了问题->立刻测试Kafka有无启动成功->没有就后台启动转为前台启动，方便查看报错信息->通过报错信息解决问题。
反面例子：直接百度搜索log_error.log中的报错信息来找解决方案，流程中间可能报错的地方多，错误范围太大了。而且网上记录的解决方案都是往集群方向上解读，我又不熟这个。别人写什么，我试什么，不停的启动关闭Kafka，很浪费时间。
环境
阿里云服务器、CentOS 7.9.2009。压缩包安装的Kafka。
# 安装Kafka
[root@wu1 ~]# tar -zvxf kafka_2.13-2.7.0.tgz -C /opt
经历如下弯路才查看到报错信息
把项目部署到服务器上时，点赞操作时，代码中用到了Kafka，/tmp/community/log_error.log中产生如下错误。
2021-05-17 12:16:52,666 ERROR [http-nio-8080-exec-2] o.s.k.s.LoggingProducerListener [LogAccessor.java:261] Exception thrown when sending a message with key='null' and payload='{"data":{"postId":277},"entityId":277,"entityType":1,"entityUserId":149,"topic":"like","userId":111}' to topic like:
org.apache.kafka.common.errors.TimeoutException: Topic like not present in metadata after 60000 ms.
2021-05-17 12:16:52,669 ERROR [http-nio-8080-exec-2] c.n.c.c.a.ExceptionAdvice [ExceptionAdvice.java:22] 服务器发生异常: Send failed; nested exception is org.apache.kafka.common.errors.TimeoutException: Topic like not present in metadata after 60000 ms.
我百度报错信息，查到了这样的解决方法：在/opt/kafka_2.13-2.7.0/config/server.properties加上
broker.id=0
port=9092
host.name={服务器内网ip}
advertised.host.name={服务器外网ip}
但重启后，仍然报该错。
# 通过kill KafkaPID的方式关闭Kafka。然后先启动zookeeper（因为我用kill命令关闭Kafka时，Zookeeper也关闭了），再启动Kafka
[root@wu1 ~]# /opt/kafka_2.13-2.7.0/bin/zookeeper-server-start.sh -daemon /opt/kafka_2.13-2.7.0/config/zookeeper.properties # 后台启动zookeeper
[root@wu1 ~]# nohup /opt/kafka_2.13-2.7.0/bin/kafka-server-start.sh /opt/kafka_2.13-2.7.0/config/server.properties 1>/dev/null 2>&1 & # 后台启动Kafka
[1] 4408
后面反应过来，试了一下Kafka有没有启动成功。发现Kafka没有启动成功。
[root@wu1 ~]# /opt/kafka_2.13-2.7.0/bin/kafka-topics.sh --list --bootstrap-server localhost:9092 # 没报错就说明启动成功
[2021-05-17 19:30:34,681] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2021-05-17 19:30:34,787] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
# 重复了多次该WARN，直到我Ctrl+C才终止。
再次后台启动Kafka，发现Kafka异常退出。
[root@wu1 ~]# nohup /opt/kafka_2.13-2.7.0/bin/kafka-server-start.sh /opt/kafka_2.13-2.7.0/config/server.properties 1>/dev/null 2>&1 & # 后台启动Kafka
[1] 10818
[root@wu1 ~]# ps -ef |grep kafka
root 11962 6522 0 19:40 pts/1 00:00:00 grep --color=auto kafka
[1]+ Exit 1 nohup /opt/kafka_2.13-2.7.0/bin/kafka-server-start.sh /opt/kafka_2.13-2.7.0/config/server.properties > /dev/null 2>&1 # 意思是启动Kafka时异常退出了Kafka。想想C语言中的exit(1)。用命令shutdown.sh来关闭tomcat时，也报了这句话，但当时我没在意。
于是转为前台方式启动Kafka，方便查看报错信息。
通过这种方式，发现，原来是因为内存不足，所以Kafka无法启动。
[root@wu1 ~]# /opt/kafka_2.13-2.7.0/bin/kafka-server-start.sh /opt/kafka_2.13-2.7.0/config/server.properties
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c0000000, 1073741824, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 1073741824 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /root/hs_err_pid2857.log
解决方法
1、kill一些不用的进程，来腾出内存。
# kill一些不用的进程，来腾出内存
[root@wu1 ~]# ps aux|head -1;ps aux|grep -v PID|sort -rn -k +4|head # 取进程占用内存(MEM)最高的前10个进程
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 19093 1.1 18.4 3660052 689448 ? Sl 08:57 3:47 /usr/java/jdk1.8.0_281-amd64/bin/java -Djava.util.logging.config.file=/www/server/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -classpath /www/server/tomcat/bin/bootstrap.jar:/www/server/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/www/server/tomcat -Dcatalina.home=/www/server/tomcat -Djava.io.tmpdir=/www/server/tomcat/temp org.apache.catalina.startup.Bootstrap start
root 29554 2.5 17.2 3690736 644352 pts/5 Sl 13:37 1:03 /usr/java/jdk1.8.0_281-amd64/bin/java -Djava.util.logging.config.file=/www/server/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -classpath /www/server/tomcat/bin/bootstrap.jar:/www/server/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/www/server/tomcat -Dcatalina.home=/www/server/tomcat -Djava.io.tmpdir=/www/server/tomcat/temp org.apache.catalina.startup.Bootstrap start
nowcode+ 10025 0.1 17.2 3167672 642680 ? Sl Apr29 36:06 /usr/java/jdk1.8.0_281-amd64/bin/java -Xshare:auto -Des.networkaddress.cache.ttl=60 -Des.networkaddress.cache.negative.ttl=10 -XX:+AlwaysPreTouch -Xss1m -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djna.nosys=true -XX:-OmitStackTraceInFastThrow -Dio.netty.noUnsafe=true -Dio.netty.noKeySetOptimization=true -Dio.netty.recycler.maxCapacityPerThread=0 -Dio.netty.allocator.numDirectArenas=0 -Dlog4j.shutdownHookEnabled=false -Dlog4j2.disable.jmx=true -Djava.locale.providers=SPI,JRE -Xms256m -Xmx512m -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -Djava.io.tmpdir=/tmp/elasticsearch-2476432088821252700 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=data -XX:ErrorFile=logs/hs_err_pid%p.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution -XX:+PrintGCApplicationStoppedTime -Xloggc:logs/gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=32 -XX:GCLogFileSize=64m -XX:MaxDirectMemorySize=268435456 -Des.path.home=/opt/elasticsearch-7.12.0 -Des.path.conf=/opt/elasticsearch-7.12.0/config -Des.distribution.flavor=default -Des.distribution.type=tar -Des.bundled_jdk=true -cp /opt/elasticsearch-7.12.0/lib/* org.elasticsearch.bootstrap.Elasticsearch -d
mysql 3802 0.2 10.0 1812572 373940 ? Sl 10:16 0:32 /www/server/mysql/bin/mysqld --basedir=/www/server/mysql --datadir=/www/server/data --plugin-dir=/www/server/mysql/lib/plugin --user=mysql --log-error=wu1.err --open-files-limit=65535 --pid-file=/www/server/data/wu1.pid --socket=/tmp/mysql.sock --port=3306
root 28511 0.0 1.9 3059008 71064 pts/5 Sl 13:31 0:02 /usr/java/jdk1.8.0_281-amd64/bin/java -Xmx512M -Xms512M -server -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:+ExplicitGCInvokesConcurrent -XX:MaxInlineLevel=15 -Djava.awt.headless=true -Xloggc:/opt/kafka_2.13-2.7.0/bin/../logs/zookeeper-gc.log -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dkafka.logs.dir=/opt/kafka_2.13-2.7.0/bin/../logs -Dlog4j.configuration=file:/opt/kafka_2.13-2.7.0/bin/../config/log4j.properties -cp %JAVA_HOME%/lib:%JAVA_HOME%/jre/lib:/opt/kafka_2.13-2.7.0/bin/../libs/activation-1.1.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/aopalliance-repackaged-2.6.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/argparse4j-0.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/audience-annotations-0.5.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/commons-cli-1.4.jar:/opt/kafka_2.13-2.7.0/bin/../libs/commons-lang3-3.8.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-api-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-basic-auth-extension-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-file-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-json-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-mirror-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-mirror-client-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-runtime-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/connect-transforms-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/hk2-api-2.6.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/hk2-locator-2.6.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/hk2-utils-2.6.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-annotations-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-core-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-databind-2.10.5.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-dataformat-csv-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-datatype-jdk8-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-jaxrs-base-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-jaxrs-json-provider-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-module-jaxb-annotations-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-module-paranamer-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jackson-module-scala_2.13-2.10.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jakarta.activation-api-1.2.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jakarta.annotation-api-1.3.5.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jakarta.inject-2.6.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jakarta.validation-api-2.0.2.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jakarta.ws.rs-api-2.1.6.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jakarta.xml.bind-api-2.3.2.jar:/opt/kafka_2.13-2.7.0/bin/../libs/javassist-3.25.0-GA.jar:/opt/kafka_2.13-2.7.0/bin/../libs/javassist-3.26.0-GA.jar:/opt/kafka_2.13-2.7.0/bin/../libs/javax.servlet-api-3.1.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/javax.ws.rs-api-2.1.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jaxb-api-2.3.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jersey-client-2.31.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jersey-common-2.31.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jersey-container-servlet-2.31.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jersey-container-servlet-core-2.31.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jersey-hk2-2.31.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jersey-media-jaxb-2.31.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jersey-server-2.31.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-client-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-continuation-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-http-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-io-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-security-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-server-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-servlet-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-servlets-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jetty-util-9.4.33.v20201020.jar:/opt/kafka_2.13-2.7.0/bin/../libs/jopt-simple-5.0.4.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka_2.13-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka_2.13-2.7.0-sources.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-clients-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-log4j-appender-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-raft-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-streams-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-streams-examples-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-streams-scala_2.13-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-streams-test-utils-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/kafka-tools-2.7.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/log4j-1.2.17.jar:/opt/kafka_2.13-2.7.0/bin/../libs/lz4-java-1.7.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/maven-artifact-3.6.3.jar:/opt/kafka_2.13-2.7.0/bin/../libs/metrics-core-2.2.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-buffer-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-codec-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-common-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-handler-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-resolver-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-transport-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-transport-native-epoll-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/netty-transport-native-unix-common-4.1.51.Final.jar:/opt/kafka_2.13-2.7.0/bin/../libs/osgi-resource-locator-1.0.3.jar:/opt/kafka_2.13-2.7.0/bin/../libs/paranamer-2.8.jar:/opt/kafka_2.13-2.7.0/bin/../libs/plexus-utils-3.2.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/reflections-0.9.12.jar:/opt/kafka_2.13-2.7.0/bin/../libs/rocksdbjni-5.18.4.jar:/opt/kafka_2.13-2.7.0/bin/../libs/scala-collection-compat_2.13-2.2.0.jar:/opt/kafka_2.13-2.7.0/bin/../libs/scala-java8-compat_2.13-0.9.1.jar:/opt/kafka_2.13-2.7.0/bin/../libs/scala-library-2.13.3.jar:/opt/kafka_2.13-2.7.0/bin/../libs/scala-logging_2.13-3.9.2.jar:/opt/kafka_2.13-2.7.0/bin/../libs/scala-reflect-2.13.3.jar:/opt/kafka_2.13-2.7.0/bin/../libs/slf4j-api-1.7.30.jar:/opt/kafka_2.13-2.7.0/bin/../libs/slf4j-log4j12-1.7.30.jar:/opt/kafka_2.13-2.7.0/bin/../libs/snappy-java-1.1.7.7.jar:/opt/kafka_2.13-2.7.0/bin/../libs/zookeeper-3.5.8.jar:/opt/kafka_2.13-2.7.0/bin/../libs/zookeeper-jute-3.5.8.jar:/opt/kafka_2.13-2.7.0/bin/../libs/zstd-jni-1.4.5-6.jar org.apache.zookeeper.server.quorum.QuorumPeerMain /opt/kafka_2.13-2.7.0/config/zookeeper.properties
root 25609 0.0 1.7 215712 66392 ? Sl Apr16 6:09 /usr/bin/fdfs_storaged /etc/fdfs/storage.conf
root 1355 0.2 1.6 566104 63368 ? Sl Mar12 217:53 /www/server/panel/pyenv/bin/python /www/server/panel/BT-Panel
root 16895 0.0 1.3 601708 50120 ? Ssl Mar19 8:44 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1329 0.1 1.1 869068 41168 ? Sl Mar12 99:14 /www/server/panel/pyenv/bin/python /www/server/panel/BT-Task
root 25246 0.0 0.8 363056 31288 ? Ssl Mar18 0:16 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --nopid
[root@wu1 ~]# kill 25609
2、修改默认配置，减少软件启动需要的内存
ElasticSearch
[root@wu1 ~]# vim /opt/elasticsearch-7.12.0/config/jvm.options # 取消下方内容的注释，修改以下内容，这两个参数要顶格写。
-Xms256m
-Xmx512m
Kafka
要修改的配置文件：/opt/kafka_2.13-2.7.0/bin/kafka-server-start.sh
原本是：export KAFKA_HEAP_OPTS="-Xmx1G -Xms1G"
修改为：export KAFKA_HEAP_OPTS="-Xmx256M -Xms128M"
Zookeeper
要修改的配置文件：/opt/kafka_2.13-2.7.0/bin/zookeeper-server-start.sh
原本是：export KAFKA_HEAP_OPTS="-Xmx512M -Xms512M"
启动成功
[root@wu1 ~]# /opt/kafka_2.13-2.7.0/bin/kafka-server-start.sh /opt/kafka_2.13-2.7.0/config/server.properties
[2021-05-17 16:28:24,132] INFO Registered kafka:type=kafka.Log4jController MBean (kafka.utils.Log4jControllerRegistration$)
[2021-05-17 16:28:24,563] INFO Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation (org.apache.zookeeper.common.X509Util)
[2021-05-17 16:28:24,629] INFO Registered signal handlers for TERM, INT, HUP (org.apache.kafka.common.utils.LoggingSignalHandler)
[2021-05-17 16:28:24,635] INFO starting (kafka.server.KafkaServer)
[2021-05-17 16:28:24,636] INFO Connecting to zookeeper on localhost:2181 (kafka.server.KafkaServer)
[2021-05-17 16:28:24,665] INFO [ZooKeeperClient Kafka server] Initializing a new session to localhost:2181. (kafka.zookeeper.ZooKeeperClient)
[2021-05-17 16:28:24,672] INFO Client environment:zookeeper.version=3.5.8-f439ca583e70862c3068a1f2a7d4d068eec33315, built on 05/04/2020 15:53 GMT (org.apache.zookeeper.ZooKeeper)
[2021-05-17 16:28:24,672] INFO Client environment:host.name=wu1 (org.apache.zookeeper.ZooKeeper)
[2021-05-17 16:28:24,672] INFO Client environment:java.version=1.8.0_281 (org.apache.zookeeper.ZooKeeper)
。。。。
其他
我是因为在安装Kafka时，能够成功启动Kafka，就是能输入下方命令不报错。
[root@wu1 ~]# /opt/kafka_2.13-2.7.0/bin/kafka-topics.sh --list --bootstrap-server localhost:9092 # 没报错就说明启动成功
没有想到为什么Kafka再启动时会因为内存不够启动不起来。
老师视频课上光说需要2核4G的服务器才能跑起来，没说这个跑起来，是在修改默认配置，减少软件启动需要的内存后，才能跑起来，他视频课上没演示，我Kafka跑不起来，百度了日志报错信息，还以为是我哪里配置出问题了，没想到是内存不够，Kafka就没有启动。坑到我了。
参考
经过这篇文提醒，我才想起来要从后台启动Kafka转为前台启动Kafka，方便查看报错信息：kafka启动后闪退-已解决 - Lucky小黄人_ - 博客园
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