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From Kohki Nishio <tarop...@icloud.com>
Subject Re: Scan returns incomplete results
Date Fri, 14 Apr 2017 03:09:40 GMT
Actually I tried the one with HBASE-15378, but it didn’t fix the problem ..


> On Apr 12, 2017, at 8:14 PM, Kohki Nishio <taroplus@icloud.com> wrote:
> 
> As far as I can see, the change is in ClientScanner class, which is a part of Hbase-client,
does this work inside Server (region server?) ?
> 
> Thanks
> -Kohki
> 
> 
>> On Apr 12, 2017, at 6:03 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>> 
>> Does the release (deployed on servers) contain HBASE-15378 ?
>> 
>> Cheers
>> 
>> On Wed, Apr 12, 2017 at 5:34 PM, Kohki Nishio <taroplus@icloud.com> wrote:
>> 
>>> Hello HBase users !
>>> 
>>> I’m seeing very strange behavior with HBase (1.1.2) and I’d like to ask
>>> some help here. I’m scanning rows but sometimes it returns incomplete
>>> results. Let’s say I’m expecting 60 rows to come back, most of times I get
>>> all of them. However sometimes (1 in 50), I get only 1 or 2 rows.
>>> 
>>> According to my test, this happens only when there are other activities
>>> (lots of PUT / GET are happening at the same time), I couldn’t reproduce
>>> with a simple standalone scan test case. First we saw this problem with
>>> AsyncHBase client then I tried v1.3 HBase client, both showed the exact
>>> same behavior.
>>> 
>>> Based on the trace log message, it seems this is not a problem at client
>>> side since two different client implementations showed the same behavior.
>>> However HBase is an established storage solution, it is so strange to see
>>> this problem at this frequency, that leads me to believe that I might be
>>> doing something very strange. But I’m not sure what to do next.
>>> 
>>> The key symptom is that it returns the correct result for most of times,
>>> but sometimes it returns very small set of results.  Any thoughts would be
>>> appreciated (RegionServer is at 1.1.2.x.x)
>>> 
>>> Thanks
>>> -Kohki
> 


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