Thx all the same , I have resolve this issue by config connAddr#metadata :)

On Wednesday, June 21, 2017 at 1:48:38 AM UTC+8, Eric Anderson wrote:
>
> You can create multiple channels to increase concurrency. Although if you 
> are hitting MAX_CONCURRENT_STREAMS limits it would be important to make 
> sure the additional channels connect to a different server, otherwise what 
> is the point of MAX_CONCURRENT_STREAMS? Also, you should make sure your 
> server is okay with you making additional connections/load.
>
> For built-in support for using multiple connections, you can follow along 
> on the issue for improving L4 proxy support 
> <https://github.com/grpc/grpc/issues/7957>. For supporting multiple 
> connections from client-side, the current idea is to add a value to the 
> service config that tells clients how many additional connections they can 
> make. At least initially, this will probably be a simple multiplier where 
> the client makes, say, 4 connections instead of 1 and round-robins across 
> them (ignoring MAX_CONCURRENT_STREAMS and load).
>
> For the moment though, you'd need to create the additional connections 
> yourself.
>
> On Fri, Jun 16, 2017 at 2:30 AM, Zeymo Wang <[email protected] 
> <javascript:>> wrote:
>
>>  In high concurrency or high performace situation, single addrConn 
>> per one endpoint will reach the limitation of HTTP2 max stream(e.g. 
>> 1000),immediatly, Is any best practice for multi-conn per one endpoint? 
>> most of balance include official RoundRobin lb are single conn per endpoint 
>> ,thx
>>
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