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From "Sebastian Toader (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMBARI-19899) Balancer triggered from Ambari UI exits after 40mins
Date Fri, 03 Mar 2017 19:55:45 GMT

     [ https://issues.apache.org/jira/browse/AMBARI-19899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sebastian Toader updated AMBARI-19899:
--------------------------------------
    Fix Version/s: 2.5.0

> Balancer triggered from Ambari UI exits after 40mins
> ----------------------------------------------------
>
>                 Key: AMBARI-19899
>                 URL: https://issues.apache.org/jira/browse/AMBARI-19899
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.4.0
>         Environment: Ambari 2.4.1.0
>            Reporter: Sandeep Nemuri
>            Assignee: Laszlo Puskas
>             Fix For: 2.5.0
>
>
> *PROBLEM* : Balancer triggered from Ambari exits from UI after 40mins with the below
error.
> {code}
> stderr: /var/lib/ambari-agent/data/errors-27542.txt 
> Traceback (most recent call last): 
> File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
line 408, in <module> 
> NameNode().execute() 
> File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py",
line 219, in execute 
> method(env) 
> File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py",
line 344, in rebalancehdfs 
> logoutput = False, 
> File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 154, in
__init__ 
> self.env.run() 
> File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line
160, in run 
> self.run_action(resource, action) 
> File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line
124, in run_action 
> provider_action() 
> File "/usr/lib/python2.6/site-packages/resource_management/core/providers/system.py",
line 238, in action_run 
> tries=self.resource.tries, try_sleep=self.resource.try_sleep) 
> File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 70, in
inner 
> result = function(command, **kwargs) 
> File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 92, in
checked_call 
> tries=tries, try_sleep=try_sleep) 
> File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 140,
in _call_wrapper 
> result = _call(command, **kwargs_copy) 
> File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 291,
in _call 
> raise Fail(err_msg) 
> resource_management.core.exceptions.Fail: Execution of 'ambari-sudo.sh su hdfs -l -s
/bin/bash -c 'export PATH='"'"'/usr/sbin:/sbin:/usr/lib/ambari-server/*:/sbin:/usr/sbin:/bin:/usr/bin:/var/lib/ambari-agent:/usr/hdp/current/hadoop-client/bin'"'"'
KRB5CCNAME=/tmp/hdfs_rebalance_cc_f89f1ef37ada08b15101ad05225cf12d ; hdfs --config /usr/hdp/current/hadoop-client/conf
balancer -threshold 10'' returned 252. 17/01/17 10:42:45 INFO balancer.Balancer: Using a threshold
of 10.0 
> 17/01/17 10:42:45 INFO balancer.Balancer: namenodes = [hdfs://sandytest] 
> 17/01/17 10:42:45 INFO balancer.Balancer: parameters = Balancer.BalancerParameters [BalancingPolicy.Node,
threshold = 10.0, max idle iteration = 5, #excluded nodes = 0, #included nodes = 0, #source
nodes = 0, #blockpools = 0, run during upgrade = false] 
> 17/01/17 10:42:45 INFO balancer.Balancer: included nodes = [] 
> 17/01/17 10:42:45 INFO balancer.Balancer: excluded nodes = [] 
> 17/01/17 10:42:45 INFO balancer.Balancer: source nodes = [] 
> Time Stamp Iteration# Bytes Already Moved Bytes Left To Move Bytes Being Moved 
> 17/01/17 10:42:46 INFO balancer.KeyManager: Block token params received from NN: update
interval=10hrs, 0sec, token lifetime=10hrs, 0sec 
> 17/01/17 10:42:46 INFO block.BlockTokenSecretManager: Setting block keys 
> 17/01/17 10:42:46 INFO balancer.KeyManager: Update block keys every 2hrs, 30mins, 0sec

> java.io.IOException: Another Balancer is running.. Exiting ... 
> Jan 17, 2017 10:42:46 AM Balancing took 2.048 seconds 
> stdout: /var/lib/ambari-agent/data/output-27542.txt 
> {code}
> One thing to note here is the balancer process will be still running in the background.
> As per [~lpuskas]
> * the command timeout comes from the custom action definition defined in the service
matainfo descriptor
> * server side the timeout is increased with a wired in 10min timeout
> (thus in case of the hdfs rebalance custom action the timeout will be 1800s+600s=2400s=40min)
> * this means that if the rebalance operation takes longer than 40 mins, the operation
will be canceled/timed out)



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