question Re: Issues adding RegionServers to datanodes in Archives of Support Questions (Read Only)

Issues adding RegionServers to datanodes

daniel_zafar — Wed, 15 Aug 2018 06:17:35 GMT

Hello, I just installed Hbase RegionServers to 2 of my datanodes. I'm getting the following error when I start them on HDP 3.0:

esource_management.core.exceptions.ExecutionFailed: Execution of '/usr/hdp/current/hbase-regionserver/bin/hbase-daemon.sh --config /usr/hdp/current/hbase-regionserver/conf start regionserver' returned 127. -bash: /usr/hdp/current/hbase-regionserver/bin/hbase-daemon.sh: No such file or directory

What am I missing?

I installed them through Ambari.

Re: Issues adding RegionServers to datanodes

apappu — Wed, 15 Aug 2018 06:21:20 GMT

@Daniel Zafar As error states it appears like the file /usr/hdp/current/hbase-regionserver/bin/hbase-daemon.sh is not present in the host. can you login to that host and validate it?

Re: Issues adding RegionServers to datanodes

daniel_zafar — Wed, 15 Aug 2018 06:24:23 GMT

@amarnath reddy pappu

Yep I don't doubt that the message is correct, what do I do next? Only conf file is present:

[dzafar@MYSERVER03 ~]$ ls /usr/hdp/current/hbase-regionserver
conf

Re: Issues adding RegionServers to datanodes

jsensharma — Wed, 15 Aug 2018 06:26:10 GMT

@Daniel Zafar

Can you please check your "/var/log/yum.log" file to see if there is any issue logged while installing Region Server.

Can you please try reinstalling the Region Server on that host again to see if it fixes missing file issue.

Re: Issues adding RegionServers to datanodes

apappu — Wed, 15 Aug 2018 06:27:11 GMT

@Daniel Zafar it seems like installation did not go through smooth - can you remove and install again?

Re: Issues adding RegionServers to datanodes

daniel_zafar — Wed, 15 Aug 2018 06:28:29 GMT

I have already removed and installed again once and it did not solve the issue.

Re: Issues adding RegionServers to datanodes

daniel_zafar — Wed, 15 Aug 2018 06:33:16 GMT

I tried another time and am still only showing the conf file present

Re: Issues adding RegionServers to datanodes

daniel_zafar — Wed, 15 Aug 2018 06:34:30 GMT

@Jay Kumar SenSharma

I didn't see an entry about the RegionServer. I tried deleting and installing again in Ambari and this did not result in anything different. Only the conf dir is present.

Re: Issues adding RegionServers to datanodes

jsensharma — Wed, 15 Aug 2018 06:34:40 GMT

@Daniel Zafar

Do you have the HBase client installed to that host as well?

Or can you try the following command manually on that host and tail the yum.log:

# yum reinstall hbase* -y

Re: Issues adding RegionServers to datanodes

daniel_zafar — Wed, 15 Aug 2018 06:45:41 GMT

@Jay Kumar SenSharma

I think the issue is with a bad hbase-client install. What is the yum install arg to reinstall that?

Re: Issues adding RegionServers to datanodes

jsensharma — Wed, 15 Aug 2018 06:51:31 GMT

@Daniel Zafar

In ambari UI --> Hosts (Tab) --> Specific Host link --> Install Clients button should install the clients.

However you can try the following command manually on the problematic host to see if it fixes your issue:

# yum reinstall hbase* -y

After the reinstall you should see the following Symlink & Directories:

# ls -l /usr/hdp/current/hbase-regionserver
lrwxrwxrwx. 1 root root 27 Jul 21 08:14 /usr/hdp/current/hbase-regionserver -> /usr/hdp/3.0.0.0-1634/hbase

and

# ls -l /usr/hdp/3.0.0.0-1634/hbase
total 20
drwxr-xr-x. 4 root root  4096 Aug 14 23:21 bin
lrwxrwxrwx. 1 root root    25 Jul 21 08:15 conf -> /etc/hbase/3.0.0.0-1634/0
drwxr-xr-x. 2 root root    61 Jul 21 08:14 doc
drwxr-xr-x. 3 root root    18 Jul 21 08:14 etc
drwxr-xr-x. 7 root root    80 Jul 21 08:14 hbase-webapps
drwxr-xr-x. 3 root root    20 Jul 21 08:14 include
drwxr-xr-x. 6 root root 12288 Jul 21 08:16 lib
drwxr-xr-x. 2 root root    19 Jul 21 08:14 logs
drwxr-xr-x. 3 root root    18 Jul 21 08:14 man
drwxr-xr-x. 2 root root    19 Jul 21 08:14 pids

Re: Issues adding RegionServers to datanodes

daniel_zafar — Wed, 15 Aug 2018 12:03:42 GMT

I had to do a lot of fanagaling but this command ultimately solved my issues. Thanks! I did inadvertantly install hbase-master on one of the datanodes and it is not registered in Ambari. Should delete it? if so, `yum remove hbase-master` did not work. How would I do so?