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From "Dmitry Lysnichenko (JIRA)" <>
Subject [jira] [Created] (AMBARI-2713) Perf: Installer host registration stuck in 'Installing' for 10mins before succeeding
Date Tue, 23 Jul 2013 20:00:49 GMT
Dmitry Lysnichenko created AMBARI-2713:

             Summary: Perf: Installer host registration stuck in 'Installing' for 10mins before
                 Key: AMBARI-2713
             Project: Ambari
          Issue Type: Bug
          Components: controller
    Affects Versions: 1.2.5
            Reporter: Dmitry Lysnichenko
            Assignee: Dmitry Lysnichenko
             Fix For: 1.4.0

I've deployed a 3-node cluster and tried to bootstrap 4 nodes. 2 nodes were 'bad' for different
ip-10-12-55-197.ec2.internal - python executables are left without x-bit
ip-10-12-55-187.ec2.internal - non existent node, does not ping
Also I've configured an intensive logging with timestamps. During bootstrap, all 4 nodes stuck
for ~5 minutes in Installing state. After that, 2 nodes became failed and other switched to
Registering state.

The root problem is that scp operation to not-existent node takes 1 minute before connection
timeout. Also.
- all parallel scp operations are performed in up to 20 threads at once. If there are more
hosts in a list, list is splitted to chunks. Next chunk launches when the previous ends. The
same thing for ssp.
- next operations are performed only when all previous parallel ssh/scp operation completes.
- done files for host are completed at last step of bootstrap, for all hosts at once. 

That's why, if we have overall 174 hosts and 26 of them are off/inaccessible/not configured
for pubkey auth:
- 174 hosts are splitted to 9 chunks of 20 hosts at initial scp operation. In every chunk
there will be ~3 dead hosts. So at every chunk, we have to wait for ~1 minute before dead
hosts time out, 9 minutes overall.
- 148 hosts that completed scp will continue bootstrap and finish in few minutes.
- when all 148 hosts finish bootstrap, done files are created for all 174 hosts . 
- server reads exits status for 174 hosts and consider bootstrap completed. That is reflected
at API.

The described behaviour is not a bug but rather the way currently works. 
Possible solutions:
- completely redesign

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