大数据之---hadoop问题排查汇总终极篇---持续更新中

Posted 2020-11-06

1、软件环境

RHEL6	角色	jdk-8u45
hadoop-2.8.1.tar.gz	?	ssh
xx.xx.xx.xx ip地址	NN	hadoop1
xx.xx.xx.xx ip地址	DN	hadoop2
xx.xx.xx.xx ip地址	DN	hadoop3
xx.xx.xx.xx ip地址	DN	hadoop4
xx.xx.xx.xx ip地址	DN	hadoop5

本次涉及伪分布式部署只是要主机hadoop1

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2、启动密钥互信问题

HDFS启动

[[email protected] hadoop]$ ./sbin/start-dfs.sh
Starting namenodes on [hadoop01]
The authenticity of host ‘hadoop01 (172.16.18.133)‘ can‘t be established.
RSA key fingerprint is 8f:e7:6c:ca:6e:40:78:b8:df:6a:b4:ca:52:c7:01:4b.
Are you sure you want to continue connecting (yes/no)? yes
hadoop01: Warning: Permanently added ‘hadoop01‘ (RSA) to the list of known hosts.
hadoop01: chown: changing ownership of `/opt/software/hadoop-2.8.1/logs‘: Operation not permitted
hadoop01: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop01.out
hadoop01: /opt/software/hadoop-2.8.1/sbin/hadoop-daemon.sh: line 159:

/opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop01.out: Permission denied

启动如果有交互输入密码，不输入报错权限限制，这是因为我们没有配置互信，

伪分布式即便在同一台机器上面我们也需要配置ssh登陆互信。

非root用户公钥文件权限必须是600权限（root除外）

在hadoop用户配置ssh免密码登陆

[[email protected] .ssh]$ cat id_rsa.pub? > authorized_keys [[email protected] .ssh]$ chmod 600 authorized_keys [[email protected] hadoop]$ ssh hadoop01 date [[email protected] .ssh]$ [[email protected] hadoop]$ ./sbin/start-dfs.sh Starting namenodes on [hadoop01] hadoop01: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop01.out hadoop01: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-datanode-hadoop01.out Starting secondary namenodes [hadoop01] hadoop01: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-secondarynamenode-hadoop01.out [[email protected] hadoop]$ jps 1761 Jps 1622 SecondaryNameNode 1388 DataNode 1276 NameNode

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3、进程process information unavailable 问题

分两种情况：1、进程不存在，且process information unavailable

????????????????????????????? 2、进程存在? 报process information unavailable

对于第一种情况：

[[email protected] sbin]$ jps 3108 DataNode 4315 Jps 4156 SecondaryNameNode 2990 NameNode [[email protected] hsperfdata_hadoop]$ ls 5295? 5415? 5640 [[email protected] hsperfdata_hadoop]$ ll total 96 -rw------- 1 hadoop hadoop 32768 Apr 27 09:35 5295 -rw------- 1 hadoop hadoop 32768 Apr 27 09:35 5415 -rw------- 1 hadoop hadoop 32768 Apr 27 09:35 5640 [[email protected] hsperfdata_hadoop]$ pwd /tmp/hsperfdata_hadoop /tmp/hsperfdata_hadoop 里面记录jps显示的进程号，如果此时jps看到报错 [[email protected] tmp]$ jps 3330 SecondaryNameNode -- process information unavailable 3108 DataNode???????????????????????? -- process information unavailable 3525 Jps 2990 NameNode????????????????????? -- process information unavailable 查询异常进程是否存在 [[email protected] tmp]$ ps -ef |grep 3330 hadoop??? 3845? 2776? 0 09:29 pts/6??? 00:00:00 grep 3330

对于进程不存在了，ok去/tmp/hsperfdata_xxx删除文件， 直接重新启动进程。。

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jps查询的是当前用户的 hsperfdata_当前用户/文件 [root@hadoop01 ~]# jps 7153 -- process information unavailable 8133 -- process information unavailable 7495 -- process information unavailable 8489 Jps [[email protected] ~]# ps -ef |grep 7153?? ---查看异常进程存在 hadoop??? 7153???? 1? 2 09:47 ???????? 00:00:17 /usr/java/jdk1.8.0_45/bin/java -Dproc_namenode -Xmx1000m -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/opt/software/hadoop-2.8.1/logs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/opt/software/hadoop-2.8.1 -Dhadoop.id.str=hadoop -Dhadoop.root.logger=INFO,console -Djava.library.path=/opt/software/hadoop-2.8.1/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Stack=true -Dhadoop.log.dir=/opt/software/hadoop-2.8.1/logs -Dhadoop.log.file=hadoop-hadoop-namenode-hadoop01.log -Dhadoop.home.dir=/opt/software/hadoop-2.8.1 -Dhadoop.id.str=hadoop -Dhadoop.root.logger=INFO,RFA -Djava.library.path=/opt/software/hadoop-2.8.1/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS -Dhdfs.audit.logger=INFO,NullAppender -Dhadoop.security.logger=INFO,RFAS org.apache.hadoop.hdfs.server.namenode.NameNode root????? 8505? 2752? 0 09:58 pts/6??? 00:00:00 grep 7153 假如存在，当前用户查看就是process information unavailable ，这时候查看是否进程是否存在，当前用户? ps –ef |grep? 进程号，看进程运行用户，不是切换用户 [[email protected] hadoop]$ jps???????????? -----切换hadoop用户查看进程 7153 NameNode 8516 Jps 8133 DataNode 7495 SecondaryNameNode 切换用户发现进程都正常。 这个情况是查看的用户不对，hadoop查看jps不是运行用户查看，这个情况是不需要进行任何处理，服务运行正常

总结：对应process information unavailable报错，处理：

1.查看进程是否存在 （进程不存在，删/tmp/hsperfdata_xxx,重新启动进程）

2.如果进程存在，查看存在的进程运行用户，如果不是当前用户 切换用户后重新运行jps