Thread leak while use ManagedChannel in grpc Java

[Deepak Agarwal]

Hi all,

      I am using grpc java as a grpc client to connect to a remote GRPC server. The RPC is a server streaming RPC.

I first build the channel (have not provided customized executor), and then invoke the RPC.

Scenario:

1. I have several destination servers where i have to connect.

2. for one destination, the same RPC can be invoked multiple times (with different parameters)

3. The RPC is server streaming RPC.

What did I do:

1. I created one ManagedChannel(have not provided customized executor) for each destination server.

2. On the same ManagedChannel, i invoke multiple RPCs as and when required, and the RPCs keeps running (server keeps on streaming) until user stops the operation.

Problem:

After few hours, i see there are many threads(in several hundreds) which are spawn by the application and it keeps on increasing with time.

PS: I don't have a thread dump. The thread leak was identified by some external tool in production environment

[Carl Mastrangelo]

You'll need to include a thread dump to diagnose this further.