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From: Kohki Nishio <taroplus@icloud.com>
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Subject: Scan returns incomplete results
Message-id: <A7A7C434-C30C-4F17-8392-114110CB9FD6@icloud.com>
Date: Wed, 12 Apr 2017 17:34:39 -0700
To: user@hbase.apache.org
archived-at: Thu, 13 Apr 2017 00:34:49 -0000

Hello HBase users !

I=E2=80=99m seeing very strange behavior with HBase (1.1.2) and I=E2=80=99=
d like to ask some help here. I=E2=80=99m scanning rows but sometimes it =
returns incomplete results. Let=E2=80=99s say I=E2=80=99m 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=E2=80=99t =
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=E2=80=99m 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=