Re: How to get Last 1000 records from 1 millions records

[Ted Yu]

Proper data structure at client side can avoid sorting. 

For example:
https://docs.oracle.com/javase/7/docs/api/java/util/LinkedList.html#addFirst(E)

> On Aug 25, 2016, at 2:45 AM, ramkrishna vasudevan 
>  wrote:
> 
> And reading thro the mail chain as Ted suggested if you setReversedScan as
> True and reverse your stop and start Row you can just do a count in your
> Row filter filter till 10k is reached and then just skip all the other
> results.
> 
> In the other logic that I had said you may have to do a sort before
> returning the collected result. In the reverse scan case too if you need
> the result in lexographical order you may need to sort it in the client
> side.
> 
> Regards
> Ram
> 
> On Thu, Aug 25, 2016 at 3:11 PM, ramkrishna vasudevan <
> ramkrishna.s.vasude...@gmail.com> wrote:
> 
>> Hi Manjeet
>> 
>> For your first question regarding fetching last 1000 records
>> 
>> First in your scan you set your start Row with the bytes corresponding to (
>> A_98_)
>> and let the end byte be the byte representation of  A_98 + 1 . I
>> mean add +1 to the last byte of what comes out of  (A_98_). So
>> this will ensure you scan only the rows corresponding to  (A_98_).
>> 
>> Just thinking the first thing that I can see is that it may be easier to
>> do this with CPs than Filters. Because filters deals with per cell or that
>> row. Adding the results and maintaing the last 10k records may be
>> difficult. I have to see in detail if possible.
>> 
>> Do you know the number of columns you have?  If there are multiple columns
>> then it is quite tricky. But if you have only one column per row then or
>> you want only the row keys
>> 
>> You can implement an User Coprocessor and in that you can implement
>> preStoreScannerOpen(). Take for eg.  you have only one family so in that
>> case in you preStoreScannerOpen you will create your own StoreScanner and
>> in the StoreScanner.next() you can
>> just skip all KeyValues and during that process keep collecting your
>> cells. Ensure you keep collecting the cells row wise by adding to a list.
>> You will have to have only the latest 1 cells in the list any time.
>> 
>> Every time keep checking if the row has reached the stopRow that is set in
>> the scan (so may be it moves to A_981112_).
>> Once you see this condition you may have to replace the list given by the
>> StoreScanner.next() call with the list that you have collected and send it
>> to the client.
>> I have not yet tried it but it can give you an idea with CPs.
>> 
>> With filters am not sure as I said as I need to read the flow and see if
>> there are any such APIs to mimic the above.
>> 
>> PS. Don't take this as a working algo. There may be reasons why it may not
>> work but you can see and read about CPs to see if something like above can
>> work out.
>> 
>> Regards
>> Ram
>> 
>> 
>> 
>> 
>> On Thu, Aug 25, 2016 at 2:16 PM, Manjeet Singh >> wrote:
>> 
>>> Hi All
>>> 
>>> I have one another question for same case
>>> 
>>> below is my sample Hbase data  as we all know that hbase store data on the
>>> basis of rowkey (sorted)
>>> below is IP as we can see 2.168.129.81_1 is in last what I am expecting it
>>> shuld come just after 1.168.129.81_2
>>> 
>>> 
>>> 
>>> 1.168.129.81_0
>>> column=c2:D_com.stackoverflow/questions/4, timestamp=1472104396288,
>>> value=4
>>> 1.168.129.81_1
>>> column=c2:D_com.stackoverflow/questions/1, timestamp=1472104396288,
>>> value=1
>>> 1.168.129.81_1
>>> column=c2:D_com.stackoverflow/questions/2, timestamp=1472104396288,
>>> value=2
>>> 1.168.129.81_2
>>> column=c2:D_com.stackoverflow/questions/0, timestamp=1472104396288,
>>> value=0
>>> 192.168.129.81_1
>>> column=c2:D_com.stackoverflow/questions/2, timestamp=1472104386671,
>>> value=2
>>> 192.168.129.81_1
>>> column=c2:D_com.stackoverflow/questions/4, timestamp=1472104386671,
>>> value=4
>>> 192.168.129.81_2
>>> column=c2:D_com.stackoverflow/questions/1, timestamp=1472104386671,
>>> value=1
>>> 192.168.129.81_3
>>> column=c2:D_com.stackoverflow/questions/0, timestamp=1472104386671,
>>> value=0
>>> 192.168.129.81_3
>>> column=c2:D_com.stackoverflow/questions/3, timestamp=1472104386671,
>>> value=3
>>> 2.168.129.81_1
>>> column=c2:D_com.stackoverflow/questions/0, timestamp=1472104404609,
>>> value=0
>>> 2.168.129.81_1
>>> column=c2:D_com.stackoverflow/questions/1, timestamp=1472104404609,
>>> value=1
>>> 2.168.129.81_1
>>> column=c2:D_com.stackoverflow/questions/2, timestamp=1472104404609,
>>> value=2
>>> 2.168.129.81_3
>>> column=c2:D_com.stackoverflow/questions/4, timestamp=1472104404609,
>>> value=4
>>> 
>>> 
>>> 
>>> On Thu, Aug 25, 2016 at 12:36 PM, Manjeet Singh <
>>> manjeet.chand...@gmail.com>
>>> wrote:
>>> 
 I am using some logical salt say I have mobile number in my row key so I
 am using some algo and fitting this mobile number into some ASCII char
 So each time I know what will be the salt so its 

Re: How to get Last 1000 records from 1 millions records

[ramkrishna vasudevan]

And reading thro the mail chain as Ted suggested if you setReversedScan as
True and reverse your stop and start Row you can just do a count in your
Row filter filter till 10k is reached and then just skip all the other
results.

In the other logic that I had said you may have to do a sort before
returning the collected result. In the reverse scan case too if you need
the result in lexographical order you may need to sort it in the client
side.

Regards
Ram

On Thu, Aug 25, 2016 at 3:11 PM, ramkrishna vasudevan <
ramkrishna.s.vasude...@gmail.com> wrote:

> Hi Manjeet
>
> For your first question regarding fetching last 1000 records
>
> First in your scan you set your start Row with the bytes corresponding to (
> A_98_)
> and let the end byte be the byte representation of  A_98 + 1 . I
> mean add +1 to the last byte of what comes out of  (A_98_). So
> this will ensure you scan only the rows corresponding to  (A_98_).
>
> Just thinking the first thing that I can see is that it may be easier to
> do this with CPs than Filters. Because filters deals with per cell or that
> row. Adding the results and maintaing the last 10k records may be
> difficult. I have to see in detail if possible.
>
> Do you know the number of columns you have?  If there are multiple columns
> then it is quite tricky. But if you have only one column per row then or
> you want only the row keys
>
> You can implement an User Coprocessor and in that you can implement
> preStoreScannerOpen(). Take for eg.  you have only one family so in that
> case in you preStoreScannerOpen you will create your own StoreScanner and
> in the StoreScanner.next() you can
> just skip all KeyValues and during that process keep collecting your
> cells. Ensure you keep collecting the cells row wise by adding to a list.
> You will have to have only the latest 1 cells in the list any time.
>
> Every time keep checking if the row has reached the stopRow that is set in
> the scan (so may be it moves to A_981112_).
> Once you see this condition you may have to replace the list given by the
> StoreScanner.next() call with the list that you have collected and send it
> to the client.
> I have not yet tried it but it can give you an idea with CPs.
>
> With filters am not sure as I said as I need to read the flow and see if
> there are any such APIs to mimic the above.
>
> PS. Don't take this as a working algo. There may be reasons why it may not
> work but you can see and read about CPs to see if something like above can
> work out.
>
> Regards
> Ram
>
>
>
>
> On Thu, Aug 25, 2016 at 2:16 PM, Manjeet Singh  > wrote:
>
>> Hi All
>>
>> I have one another question for same case
>>
>> below is my sample Hbase data  as we all know that hbase store data on the
>> basis of rowkey (sorted)
>> below is IP as we can see 2.168.129.81_1 is in last what I am expecting it
>> shuld come just after 1.168.129.81_2
>>
>>
>>
>>  1.168.129.81_0
>>  column=c2:D_com.stackoverflow/questions/4, timestamp=1472104396288,
>> value=4
>>  1.168.129.81_1
>>  column=c2:D_com.stackoverflow/questions/1, timestamp=1472104396288,
>> value=1
>>  1.168.129.81_1
>>  column=c2:D_com.stackoverflow/questions/2, timestamp=1472104396288,
>> value=2
>>  1.168.129.81_2
>>  column=c2:D_com.stackoverflow/questions/0, timestamp=1472104396288,
>> value=0
>>  192.168.129.81_1
>>  column=c2:D_com.stackoverflow/questions/2, timestamp=1472104386671,
>> value=2
>>  192.168.129.81_1
>>  column=c2:D_com.stackoverflow/questions/4, timestamp=1472104386671,
>> value=4
>>  192.168.129.81_2
>>  column=c2:D_com.stackoverflow/questions/1, timestamp=1472104386671,
>> value=1
>>  192.168.129.81_3
>>  column=c2:D_com.stackoverflow/questions/0, timestamp=1472104386671,
>> value=0
>>  192.168.129.81_3
>>  column=c2:D_com.stackoverflow/questions/3, timestamp=1472104386671,
>> value=3
>>  2.168.129.81_1
>>  column=c2:D_com.stackoverflow/questions/0, timestamp=1472104404609,
>> value=0
>>  2.168.129.81_1
>>  column=c2:D_com.stackoverflow/questions/1, timestamp=1472104404609,
>> value=1
>>  2.168.129.81_1
>>  column=c2:D_com.stackoverflow/questions/2, timestamp=1472104404609,
>> value=2
>>  2.168.129.81_3
>>  column=c2:D_com.stackoverflow/questions/4, timestamp=1472104404609,
>> value=4
>>
>>
>>
>> On Thu, Aug 25, 2016 at 12:36 PM, Manjeet Singh <
>> manjeet.chand...@gmail.com>
>> wrote:
>>
>> > I am using some logical salt say I have mobile number in my row key so I
>> > am using some algo and fitting this mobile number into some ASCII char
>> > So each time I know what will be the salt so its clear to me and it will
>> > never change the order
>> > example
>> > if based on my algo I get A for 98
>> > so each time it will always return me A for 98
>> > so if I have my row key Like
>> > A_98_101
>> > A_98_102
>> > A_98_103
>> > A_98_104
>> > A_98_105
>> > A_98_106
>> > A_98_107
>> > A_98_108
>> >

Re: How to get Last 1000 records from 1 millions records

[ramkrishna vasudevan]

Hi Manjeet

For your first question regarding fetching last 1000 records

First in your scan you set your start Row with the bytes corresponding to (
A_98_)
and let the end byte be the byte representation of  A_98 + 1 . I
mean add +1 to the last byte of what comes out of  (A_98_). So this
will ensure you scan only the rows corresponding to  (A_98_).

Just thinking the first thing that I can see is that it may be easier to do
this with CPs than Filters. Because filters deals with per cell or that
row. Adding the results and maintaing the last 10k records may be
difficult. I have to see in detail if possible.

Do you know the number of columns you have?  If there are multiple columns
then it is quite tricky. But if you have only one column per row then or
you want only the row keys

You can implement an User Coprocessor and in that you can implement
preStoreScannerOpen(). Take for eg.  you have only one family so in that
case in you preStoreScannerOpen you will create your own StoreScanner and
in the StoreScanner.next() you can
just skip all KeyValues and during that process keep collecting your cells.
Ensure you keep collecting the cells row wise by adding to a list. You will
have to have only the latest 1 cells in the list any time.

Every time keep checking if the row has reached the stopRow that is set in
the scan (so may be it moves to A_981112_).
Once you see this condition you may have to replace the list given by the
StoreScanner.next() call with the list that you have collected and send it
to the client.
I have not yet tried it but it can give you an idea with CPs.

With filters am not sure as I said as I need to read the flow and see if
there are any such APIs to mimic the above.

PS. Don't take this as a working algo. There may be reasons why it may not
work but you can see and read about CPs to see if something like above can
work out.

Regards
Ram




On Thu, Aug 25, 2016 at 2:16 PM, Manjeet Singh 
wrote:

> Hi All
>
> I have one another question for same case
>
> below is my sample Hbase data  as we all know that hbase store data on the
> basis of rowkey (sorted)
> below is IP as we can see 2.168.129.81_1 is in last what I am expecting it
> shuld come just after 1.168.129.81_2
>
>
>
>  1.168.129.81_0
>  column=c2:D_com.stackoverflow/questions/4, timestamp=1472104396288,
> value=4
>  1.168.129.81_1
>  column=c2:D_com.stackoverflow/questions/1, timestamp=1472104396288,
> value=1
>  1.168.129.81_1
>  column=c2:D_com.stackoverflow/questions/2, timestamp=1472104396288,
> value=2
>  1.168.129.81_2
>  column=c2:D_com.stackoverflow/questions/0, timestamp=1472104396288,
> value=0
>  192.168.129.81_1
>  column=c2:D_com.stackoverflow/questions/2, timestamp=1472104386671,
> value=2
>  192.168.129.81_1
>  column=c2:D_com.stackoverflow/questions/4, timestamp=1472104386671,
> value=4
>  192.168.129.81_2
>  column=c2:D_com.stackoverflow/questions/1, timestamp=1472104386671,
> value=1
>  192.168.129.81_3
>  column=c2:D_com.stackoverflow/questions/0, timestamp=1472104386671,
> value=0
>  192.168.129.81_3
>  column=c2:D_com.stackoverflow/questions/3, timestamp=1472104386671,
> value=3
>  2.168.129.81_1
>  column=c2:D_com.stackoverflow/questions/0, timestamp=1472104404609,
> value=0
>  2.168.129.81_1
>  column=c2:D_com.stackoverflow/questions/1, timestamp=1472104404609,
> value=1
>  2.168.129.81_1
>  column=c2:D_com.stackoverflow/questions/2, timestamp=1472104404609,
> value=2
>  2.168.129.81_3
>  column=c2:D_com.stackoverflow/questions/4, timestamp=1472104404609,
> value=4
>
>
>
> On Thu, Aug 25, 2016 at 12:36 PM, Manjeet Singh <
> manjeet.chand...@gmail.com>
> wrote:
>
> > I am using some logical salt say I have mobile number in my row key so I
> > am using some algo and fitting this mobile number into some ASCII char
> > So each time I know what will be the salt so its clear to me and it will
> > never change the order
> > example
> > if based on my algo I get A for 98
> > so each time it will always return me A for 98
> > so if I have my row key Like
> > A_98_101
> > A_98_102
> > A_98_103
> > A_98_104
> > A_98_105
> > A_98_106
> > A_98_107
> > A_98_108
> >
> > it will sort my row key in same manner as showing above now these are
> > millions of record now i want to get last 1 records
> > is their any way to get it, my concern is to perform all calcuation on
> > server side not client side.
> >
> >
> > Thanks
> > Manjeet
> >
> >
> > On Thu, Aug 25, 2016 at 1:06 AM, Esteban Gutierrez  >
> > wrote:
> >
> >> As long as new rows are added to the latest region that "might" work.
> But
> >> if the table is using hashed keys or rows are added randomly to the
> table
> >> then retrieving the last million will be trickier and you will have to
> >> scan
> >> based on timestamp (if not modified) and then filter one more time.
> >>
> >> esteban.
> >>

Re: How to get Last 1000 records from 1 millions records

[Manjeet Singh]

Hi All

I have one another question for same case

below is my sample Hbase data  as we all know that hbase store data on the
basis of rowkey (sorted)
below is IP as we can see 2.168.129.81_1 is in last what I am expecting it
shuld come just after 1.168.129.81_2



 1.168.129.81_0
 column=c2:D_com.stackoverflow/questions/4, timestamp=1472104396288, value=4
 1.168.129.81_1
 column=c2:D_com.stackoverflow/questions/1, timestamp=1472104396288, value=1
 1.168.129.81_1
 column=c2:D_com.stackoverflow/questions/2, timestamp=1472104396288, value=2
 1.168.129.81_2
 column=c2:D_com.stackoverflow/questions/0, timestamp=1472104396288, value=0
 192.168.129.81_1
 column=c2:D_com.stackoverflow/questions/2, timestamp=1472104386671, value=2
 192.168.129.81_1
 column=c2:D_com.stackoverflow/questions/4, timestamp=1472104386671, value=4
 192.168.129.81_2
 column=c2:D_com.stackoverflow/questions/1, timestamp=1472104386671, value=1
 192.168.129.81_3
 column=c2:D_com.stackoverflow/questions/0, timestamp=1472104386671, value=0
 192.168.129.81_3
 column=c2:D_com.stackoverflow/questions/3, timestamp=1472104386671, value=3
 2.168.129.81_1
 column=c2:D_com.stackoverflow/questions/0, timestamp=1472104404609, value=0
 2.168.129.81_1
 column=c2:D_com.stackoverflow/questions/1, timestamp=1472104404609, value=1
 2.168.129.81_1
 column=c2:D_com.stackoverflow/questions/2, timestamp=1472104404609, value=2
 2.168.129.81_3
 column=c2:D_com.stackoverflow/questions/4, timestamp=1472104404609, value=4



On Thu, Aug 25, 2016 at 12:36 PM, Manjeet Singh 
wrote:

> I am using some logical salt say I have mobile number in my row key so I
> am using some algo and fitting this mobile number into some ASCII char
> So each time I know what will be the salt so its clear to me and it will
> never change the order
> example
> if based on my algo I get A for 98
> so each time it will always return me A for 98
> so if I have my row key Like
> A_98_101
> A_98_102
> A_98_103
> A_98_104
> A_98_105
> A_98_106
> A_98_107
> A_98_108
>
> it will sort my row key in same manner as showing above now these are
> millions of record now i want to get last 1 records
> is their any way to get it, my concern is to perform all calcuation on
> server side not client side.
>
>
> Thanks
> Manjeet
>
>
> On Thu, Aug 25, 2016 at 1:06 AM, Esteban Gutierrez 
> wrote:
>
>> As long as new rows are added to the latest region that "might" work. But
>> if the table is using hashed keys or rows are added randomly to the table
>> then retrieving the last million will be trickier and you will have to
>> scan
>> based on timestamp (if not modified) and then filter one more time.
>>
>> esteban.
>>
>>
>> --
>> Cloudera, Inc.
>>
>>
>> On Wed, Aug 24, 2016 at 12:31 PM, Ted Yu  wrote:
>>
>> > The following API should help in your case:
>> >
>> >   public Scan setReversed(boolean reversed) {
>> >
>> > Cheers
>> >
>> > On Wed, Aug 24, 2016 at 12:05 PM, Manjeet Singh <
>> > manjeet.chand...@gmail.com>
>> > wrote:
>> >
>> > > Hi all
>> > >
>> > > Hbase didnt provide sorting on column but rowkey store in sorted form
>> > > like small value first and greater value last
>> > >
>> > > example
>> > > 1
>> > > 2
>> > > 3
>> > > 4
>> > > 5
>> > > 6
>> > > 7
>> > > and so on
>> > >
>> > > Assume I have 1 Miilions record but i want to look last 1000 records
>> only
>> > > Is their any way to do this? I don't want to perform any calculation
>> on
>> > > client side so may be any filter can help on it?
>> > >
>> > > Thanks
>> > > Manjeet
>> > >
>> > > --
>> > > luv all
>> > >
>> >
>>
>
>
>
> --
> luv all
>



-- 
luv all

Re: How to get Last 1000 records from 1 millions records

[Manjeet Singh]

I am using some logical salt say I have mobile number in my row key so I am
using some algo and fitting this mobile number into some ASCII char
So each time I know what will be the salt so its clear to me and it will
never change the order
example
if based on my algo I get A for 98
so each time it will always return me A for 98
so if I have my row key Like
A_98_101
A_98_102
A_98_103
A_98_104
A_98_105
A_98_106
A_98_107
A_98_108

it will sort my row key in same manner as showing above now these are
millions of record now i want to get last 1 records
is their any way to get it, my concern is to perform all calcuation on
server side not client side.


Thanks
Manjeet


On Thu, Aug 25, 2016 at 1:06 AM, Esteban Gutierrez 
wrote:

> As long as new rows are added to the latest region that "might" work. But
> if the table is using hashed keys or rows are added randomly to the table
> then retrieving the last million will be trickier and you will have to scan
> based on timestamp (if not modified) and then filter one more time.
>
> esteban.
>
>
> --
> Cloudera, Inc.
>
>
> On Wed, Aug 24, 2016 at 12:31 PM, Ted Yu  wrote:
>
> > The following API should help in your case:
> >
> >   public Scan setReversed(boolean reversed) {
> >
> > Cheers
> >
> > On Wed, Aug 24, 2016 at 12:05 PM, Manjeet Singh <
> > manjeet.chand...@gmail.com>
> > wrote:
> >
> > > Hi all
> > >
> > > Hbase didnt provide sorting on column but rowkey store in sorted form
> > > like small value first and greater value last
> > >
> > > example
> > > 1
> > > 2
> > > 3
> > > 4
> > > 5
> > > 6
> > > 7
> > > and so on
> > >
> > > Assume I have 1 Miilions record but i want to look last 1000 records
> only
> > > Is their any way to do this? I don't want to perform any calculation on
> > > client side so may be any filter can help on it?
> > >
> > > Thanks
> > > Manjeet
> > >
> > > --
> > > luv all
> > >
> >
>



-- 
luv all

Re: How to get Last 1000 records from 1 millions records

[Dima Spivak]

Hey Manjeet,

How much data are you actually trying to get the last 1000 records for? If
you're dealing at the scale of only millions of rows, HBase may not be the
best choice for this type of problem.

On Wed, Aug 24, 2016 at 12:05 PM, Manjeet Singh 
wrote:

> Hi all
>
> Hbase didnt provide sorting on column but rowkey store in sorted form
> like small value first and greater value last
>
> example
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> and so on
>
> Assume I have 1 Miilions record but i want to look last 1000 records only
> Is their any way to do this? I don't want to perform any calculation on
> client side so may be any filter can help on it?
>
> Thanks
> Manjeet
>
> --
> luv all
>



-- 
-Dima

Re: How to get Last 1000 records from 1 millions records

[Ted Yu]

Manjeet didn't mention hashing.
Nor did the example show hashed keys.

Cheers

On Wed, Aug 24, 2016 at 12:36 PM, Esteban Gutierrez 
wrote:

> As long as new rows are added to the latest region that "might" work. But
> if the table is using hashed keys or rows are added randomly to the table
> then retrieving the last million will be trickier and you will have to scan
> based on timestamp (if not modified) and then filter one more time.
>
> esteban.
>
>
> --
> Cloudera, Inc.
>
>
> On Wed, Aug 24, 2016 at 12:31 PM, Ted Yu  wrote:
>
> > The following API should help in your case:
> >
> >   public Scan setReversed(boolean reversed) {
> >
> > Cheers
> >
> > On Wed, Aug 24, 2016 at 12:05 PM, Manjeet Singh <
> > manjeet.chand...@gmail.com>
> > wrote:
> >
> > > Hi all
> > >
> > > Hbase didnt provide sorting on column but rowkey store in sorted form
> > > like small value first and greater value last
> > >
> > > example
> > > 1
> > > 2
> > > 3
> > > 4
> > > 5
> > > 6
> > > 7
> > > and so on
> > >
> > > Assume I have 1 Miilions record but i want to look last 1000 records
> only
> > > Is their any way to do this? I don't want to perform any calculation on
> > > client side so may be any filter can help on it?
> > >
> > > Thanks
> > > Manjeet
> > >
> > > --
> > > luv all
> > >
> >
>

Re: How to get Last 1000 records from 1 millions records

[Esteban Gutierrez]

As long as new rows are added to the latest region that "might" work. But
if the table is using hashed keys or rows are added randomly to the table
then retrieving the last million will be trickier and you will have to scan
based on timestamp (if not modified) and then filter one more time.

esteban.


--
Cloudera, Inc.


On Wed, Aug 24, 2016 at 12:31 PM, Ted Yu  wrote:

> The following API should help in your case:
>
>   public Scan setReversed(boolean reversed) {
>
> Cheers
>
> On Wed, Aug 24, 2016 at 12:05 PM, Manjeet Singh <
> manjeet.chand...@gmail.com>
> wrote:
>
> > Hi all
> >
> > Hbase didnt provide sorting on column but rowkey store in sorted form
> > like small value first and greater value last
> >
> > example
> > 1
> > 2
> > 3
> > 4
> > 5
> > 6
> > 7
> > and so on
> >
> > Assume I have 1 Miilions record but i want to look last 1000 records only
> > Is their any way to do this? I don't want to perform any calculation on
> > client side so may be any filter can help on it?
> >
> > Thanks
> > Manjeet
> >
> > --
> > luv all
> >
>

Re: How to get Last 1000 records from 1 millions records

[Ted Yu]

The following API should help in your case:

  public Scan setReversed(boolean reversed) {

Cheers

On Wed, Aug 24, 2016 at 12:05 PM, Manjeet Singh 
wrote:

> Hi all
>
> Hbase didnt provide sorting on column but rowkey store in sorted form
> like small value first and greater value last
>
> example
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> and so on
>
> Assume I have 1 Miilions record but i want to look last 1000 records only
> Is their any way to do this? I don't want to perform any calculation on
> client side so may be any filter can help on it?
>
> Thanks
> Manjeet
>
> --
> luv all
>