The way that Anoop has suggested will make you issue a scan command from the client but the CP hook will tel you what are the KVs in the memstore based on that particular scan's current read point.
I think to scan the HFiles directly are you using MapReduce? Or you are directly reading the HFiles knowing the HDFS path? Currently i don think there is any way to access a Memstore directlly, leave even the Memstore you cannot access the HRegion directly if am not wrong. Regards Ram On Thu, Mar 21, 2013 at 3:14 PM, Snake <[email protected]> wrote: > We are attempting to implement hbase as data source in drill. We don't > want to use hbase client to scan data(performance consideration). We > divided the scan process into two parts, read hfile directly and read data > in memstore from region server. > 在 2013-3-21，下午5:31， Anoop Sam John 写道： > > > How you can be sure abt data will be in memstore only. What if in btw > flush happening? Which version in use? > > In 94.x version (I am not sure abt the .x version no#) there is > preStoreScannerOpen() CP hook. This impl can return a KVScanner for a store > (In your impl the scanner can be only for Memstore?). Pls see how this hook > is being used and how the StoreScanner is being created. > > > > Can you think of control this using TimeRange on Scan ? > > > > -Anoop- > > ________________________________________ > > From: Snake [[email protected]] > > Sent: Thursday, March 21, 2013 2:35 PM > > To: [email protected] > > Subject: Is there a way to only scan data in memstore > > > > Hi, > > > > I just want to scan data in memstore, but I saw InternalScan is private > class. Is there a way i can do it without change the hbase source code? > > > > Thanks, > > Snake > >
