I've setup an ArangoDB cluster on three machines, following the 
instructions present here 
: https://docs.arangodb.com/3.0/Manual/Deployment/Distributed.html

Then i injested documents using ArangoImp and it worked  perfectly, with 
good performance. 

After about a day, One of the Primary DB servers went down with the below 
error : 

2016-09-06T02:44:24Z [29600] ERROR {threads} could not start thread 
'DispatcherStd': Cannot allocate memory
2016-09-06T02:44:24Z [29600] FATAL cannot start dispatcher thread

When i restarted the processes present in the DB server machine, it was not 
detected by the co-ordinator machine.

Are there any guidelines to bring up the server, when one of the machine 
goes down.

However, if i remove all the agency, primary and co-ordinator directories, 
and re-start all the process from start then arangoDB is working
properly.

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