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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Failed in connection to self
Date Thu, 01 Dec 2011 00:48:33 GMT
I agree with you, it's not the best. I talked briefly about this
yesterday at the developers meetup, there are a lot of stack traces
that are coming from the DFSClient that we have no control over and we
don't even have the opportunity to clarify them on our side. Silencing
them is obviously not an option in case things go really wrong and
those INFO-level messages become useful. Nor can we change them
directly in the Hadoop code to suit us better since we're only one use
case among others.

So it's an open issue.

J-D

On Wed, Nov 30, 2011 at 2:01 PM, Mikael Sitruk <mikael.sitruk@gmail.com> wrote:
> J.D hi
>
> Well from the HBase POV at the end every thing is ok, but from the user POV
> he sees that HBase encontourned a problem while opening a Region. Then few
> line later HBase is fine with the file that previously got error. This is
> confusing for the user a little bit.
> But you are right, nothing can really be done to clarify the confusion
> untill the user get use to.
>
> Thanks.
> Mikael.S
> On Wed, Nov 30, 2011 at 8:38 PM, Jean-Daniel Cryans <jdcryans@apache.org>wrote:
>
>> On Tue, Nov 29, 2011 at 10:28 PM, Mikael Sitruk <mikael.sitruk@gmail.com>
>> wrote:
>> > First thanks for answering, second i still have some question see inline
>> >
>> > Thanks
>> > Mikael.S
>> >
>> > ---
>> > Shouldn't be an added value to add some information in the original
>> message
>> > like (failed to load ... will try later), then when the bloom filter is
>> > successfully loaded to print a corresponding message like - (loaded col
>> > bloom filter .... successfully after x attempt)?
>>
>> We have 0 control on that stack trace because it comes from the depths
>> of the DFSClient:
>>
>> 2011-11-28 15:12:53,052 INFO org.apache.hadoop.hdfs.DFSClient
>>
>> So from the HBase POV, nothing wrong happened. Also I don't know why
>> it would say it failed to load something because it didn't, if you
>> look at you log carefully you'll see that each loaded bloom filter is
>> for a different file and none failed.
>>
>> >
>> > Let assume that the 2 other replica are lost too, what hbase will
>> indicate
>> > in this case? will an error be created (big enough to bring attention to
>> > someone)?
>>
>> It would fail in a flamboyant way.
>>
>> J-D
>>
>
>
>
> --
> Mikael.S

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