CDH5.12安装遇到的坑

环境：centos7+cdh5.12

问题描述：

在搭建过的CDH机器上重新搭建CDH集群，没有删除数据。导致新搭建的CDH，这两台DATANode启动不了.....

特殊情况：

本人以前在这两台机器上搭建过CDH，所以存在版本问题

1、找到你以前搭建的datanode数据目录，/dfs/dn/current，查看VERSION

eg(不能启动的datanode):
    storageID=DS-64482928-918c-48a6-b78c-167f4cd90218
    clusterID=cluster10
    cTime=0
    datanodeUuid=1d881f40-21e5-4e5b-91ba-f6ade5223eb3
    storageType=DATA_NODE
    layoutVersion=-56

eg(正常启动的datanode):
    storageID=DS-64482928-918c-48a6-b78c-167f4cd90218
    clusterID=cluster8
    cTime=0
    datanodeUuid=1d881f40-21e5-4e5b-91ba-f6ade5223eb3
    storageType=DATA_NODE
    layoutVersion=-56

解决方法：

只需要将clusterID=cluster10改为clusterID=cluster8

2、问题描述：HDFS添加 NFS Gateway 角色实例启动失败问题及解决办法

错误描述1:

    unlimited
    Cannot connect to port 111.
    No portmap or rpcbind service is running  on this host. Please start portmap or rpcbind service before attempting to  start the NFS Gateway role on this host.

解决方法：

    yum -y install nfs-utils

    yum -y install rpcbind

    systemctl start rpcbind

    systemctl status rpcbind

错误描述2:

NFS service is already running on this host. Please stop the NFS service run
    表示你启动了nfs，和CDH冲突

解决方法：

service nfs stop

 3、Kafka：Configured broker.id 2 doesn't match stored broker.id 0 in meta.properties. 既kafka broker无法启动

错误描述：

2020-11-18 11:16:43,592 FATAL kafka.server.KafkaServer: Fatal error during KafkaServer startup. Prepare to shutdown
kafka.common.InconsistentBrokerIdException: Configured broker.id 98 doesn't match stored broker.id 102 in meta.properties. If you moved your data, make sure your configured broker.id matches. If you intend to create a new broker, you should remove all data in your data directories (log.dirs).
        at kafka.server.KafkaServer.getBrokerId(KafkaServer.scala:650)
        at kafka.server.KafkaServer.startup(KafkaServer.scala:187)
        at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:37)
        at kafka.Kafka$.main(Kafka.scala:67)
        at com.cloudera.kafka.wrap.Kafka$.main(Kafka.scala:76)
        at com.cloudera.kafka.wrap.Kafka.main(Kafka.scala)
2020-11-18 11:16:43,593 INFO kafka.server.KafkaServer: shutting down

解决方法：broker.id不一致导致的，修改meta.properties中的broker.id即可。

cd /var/local/kafka/data

$ cat meta.properties 
#
#Mon Nov 16 13:20:17 CST 2020
version=0
broker.id=98
#broker.id=102