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From Rural Hunter <ruralhun...@gmail.com>
Subject Re: hbase region servers refuse connection
Date Tue, 15 Jul 2014 05:52:25 GMT
Hi Tian Qiang,

Thanks for the detailed explaination. I have deployed the latest code of 
0.96 branch with hbase-11277 applied. I will keep monitoring to see if 
there is still problem and the necessarity of hbase-11306.

于 2014/7/15 11:06, Qiang Tian 写道:
> Hi, below is more details.
>
> the read0 stacktrace you see means reader wants to read something from
> client RPC call. in Andrew's test it shows it is in reading RPC request
> data (reasonable. since other meta data size is quite small).  although
> client follows request-receive style, when multiple clients share the
> connection(the default case), the synchronization window when writing to
> the same channel is quite small. if those request data have big size, there
> might be a sudden rush to the transportation layer..might causing RPC
> server could not receive the data in time due to congestion control,
> without hbase11277, the reader get 0 byte read again and again...
>
> with hbase11277 the problem should be resolved - we get back to complete
> non-blocking IO, but it is still worth investigation non-shared connection
> under high workload(hbase11306).


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