[erlang-questions] ssh_sftp start_channel function call is getting failed

Arun arunp@REDACTED
Wed Oct 4 08:09:02 CEST 2017

Hi all,

We are running a distributed system with one server node and hundreds of 
client nodes(the systems are distributed over the intra-net). We have a 
requirement that all the client nodes will connect to the server node 
and try to download some file(mostly the same file will be accessed by 
all client nodes) *simultaneously* by using *sftp. *The steps we follow 
for downloading the file is:

1. Establish ssh sftp connection between the server node and client node 
using ssh_sftp:start_channel/2 function call.

2. Then reads the file by doing ssh_sftp:read_file/2 function call.

The problem what we are facing is that when the number of clients are 
more then it is observed that few client nodes are failing to establish 
connection between server node. i.e. the ssh_sftp:start_channel/2 
function call is failing.

Can somebody please explain me;

1.  Is there any limitation for the number of sftp session what we can 
establish in a single system ?

2. What are the possible reason because of which the connection request 
fails ?

3. Is there anything wrong we are doing in this approach ?

4. Is there any better solution by which we can guarantee that all 
client nodes will be able to connect to server and will be able to 
download the file.

*Observation:* We tried to connect 25 client nodes to the server; during 
the first try only 2 nodes failed to connect and on the second try 5 
nodes failed to connect. Why this random behavior ?.

Thanks in advance,
Arun P.

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