Dmitry Lysnichenko created AMBARI-2713:
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Summary: Perf: Installer host registration stuck in 'Installing'
for 10mins before succeeding
Key: AMBARI-2713
URL: https://issues.apache.org/jira/browse/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 reasons
{code}
ip-10-147-179-78.ec2.internal
ip-10-34-15-110.ec2.internal
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
{code}
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 bootstrap.py currently
works.
Possible solutions:
- completely redesign bootstrap.py
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