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From Qiang Tian <tian...@gmail.com>
Subject Re: hbase region servers refuse connection
Date Tue, 15 Jul 2014 06:25:56 GMT
just to clarify, ignore attached patch on hbase-11306. there is no
conclusion for the behavior of hbase-11306 yet, the shared connection is
just a suspect.
thanks.



On Tue, Jul 15, 2014 at 1:52 PM, Rural Hunter <ruralhunter@gmail.com> wrote:

> 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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