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Date: Thu, 21 Mar 2013 21:19:23 -0700 (PDT)
From: lars hofhansl <larsh@apache.org>
Reply-To: lars hofhansl <larsh@apache.org>
Subject: Re: Is there a way to only scan data in memstore
To: "user@hbase.apache.org" <user@hbase.apache.org>
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We should talk.=0A=0AIf you can envision an interface that is faster, maybe=
 we can provide the right shortcut or change things around in the client to=
 access the data at the right stage or format.=0A=0A=0A____________________=
____________=0A From: Snake <yfwang@xingcloud.com>=0ATo: user@hbase.apache.=
org =0ASent: Thursday, March 21, 2013 2:44 AM=0ASubject: Re: Is there a way=
 to only scan data in memstore=0A =0AWe are attempting to implement hbase a=
s data source in drill.=C2=A0 We don't want to use hbase client to scan dat=
a(performance consideration). We divided the scan process into two parts, r=
ead hfile directly and read data in memstore from region server.=0A=E5=9C=
=A8 2013-3-21=EF=BC=8C=E4=B8=8B=E5=8D=885:31=EF=BC=8C Anoop Sam John =E5=86=
=99=E9=81=93=EF=BC=9A=0A=0A> How you can be sure abt data will be in memsto=
re only. What if in btw flush happening?=C2=A0  Which version in use?=0A> I=
n 94.x version (I am not sure abt the .x version no#) there is preStoreScan=
nerOpen() CP hook. This impl can return a KVScanner for a store (In your im=
pl the scanner can be only for Memstore?). Pls see how this hook is being u=
sed and how the StoreScanner is being created.=0A> =0A> Can you think of co=
ntrol this using TimeRange on Scan ?=0A> =0A> -Anoop-=0A> _________________=
_______________________=0A> From: Snake [yfwang@xingcloud.com]=0A> Sent: Th=
ursday, March 21, 2013 2:35 PM=0A> To: user@hbase.apache.org=0A> Subject: I=
s there a way to only scan data in memstore=0A> =0A> Hi,=0A> =0A> I just wa=
nt to scan data in memstore, but I saw InternalScan is private class.=C2=A0=
 Is there a way i can do it without change the hbase source code?=0A> =0A> =
Thanks,=0A> Snake
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