Thanks for the answer.
But I am asking about versioning in D4M style. How can I use versioning
iterator in D4M style as in D4M style, in Rowid id is strored and
field|value is stored in ColumnQualifier. So as value is stored in
columnQualifier I cannot maintain versions through versioning iterator.
So I am asking how will I maintain versioning in D4M style?
Thanks
Shweta
On Friday 27 November 2015 12:45 PM, Dylan Hutchison wrote:
In order to store five versions of a key but return only one of them
during a scan, set the minc and majc VersioningIterator to 5 and set
the scan VersioningIterator to 1. You can set scanning iterators on a
per-scan basis if this helps.
It is not necessary to put the timestamp in the column family if you
are going with the VersioningIterator approach.
There are many ways to achieve versioning in Accumulo. As the
designer/programmer, you must choose one that fits your application,
of which we do not know the full details. It sounds like you have
narrowed your choice to (1) putting the timestamp in the column
family, or (2) not putting the timestamp anywhere else but instead
changing the VersioningIterator such that Accumulo stores more
versions than the latest version of a (row,colfam,colqual,colvis) key.
On Thu, Nov 26, 2015 at 8:45 PM, mohit.kaushik
<mohit.kaus...@orkash.com <mailto:mohit.kaus...@orkash.com>> wrote:
David,
But this is the case when we store versions based on timestamp
field. The point is, in D4M schema we can not achieve it by doing
this. In this case we are considering CF to store timestamp in
reverse order as described by Dylan. Then how can we configure
Accumulo to return only latest version and store only 5 versions?
Thanks
Mohit Kaushik
On 11/27/2015 09:54 AM, David Medinets wrote:
From the user manual:
user@myinstance mytable> config -t mytable -s
table.iterator.scan.vers.opt.maxVersions=5
user@myinstance mytable> config -t mytable -s
table.iterator.minc.vers.opt.maxVersions=5
user@myinstance mytable> config -t mytable -s
table.iterator.majc.vers.opt.maxVersions=5
On Thu, Nov 26, 2015 at 11:10 PM, shweta.agrawal
<shweta.agra...@orkash.com <mailto:shweta.agra...@orkash.com>> wrote:
I want to maintain 5 versions only and user can enter any
number of versions but I want to keep only 5 latest version.
On Friday 27 November 2015 09:38 AM, David Medinets wrote:
Do you want five versions of every entry or will the number
of versions vary?
On Thu, Nov 26, 2015 at 10:53 PM, shweta.agrawal
<shweta.agra...@orkash.com
<mailto:shweta.agra...@orkash.com>> wrote:
Thanks Dylan and David.
I can store version information in column family. But my
problem is when I have many versions of the same key how
will I manage that. In Accumulo versioning I can specify
that how many versions I want to manage.
Suppose I have 10 versions and I only want 5 versions to
store, how to manage this in a big table?
Thanks
Shweta
On Thursday 26 November 2015 10:22 PM, David Medinets wrote:
What are the query patterns? If you are versioning for
auditing then changing the VersioningIterator seems the
easiest approach. You could also store
application-specific version information in the column
family. One of the reasons that D4M does not use it is
to allow application-specific uses. Using the CF means
that any applications that understand D4M would not
need to change their queries to adjust for the version
information.
On Thu, Nov 26, 2015 at 4:26 AM, shweta.agrawal
<shweta.agra...@orkash.com
<mailto:shweta.agra...@orkash.com>> wrote:
Hi,
I have my data stored in D4M style. I also want to
maintain versions of different value on the basis
of time. As in D4M style data is only in rowid
and colQualifier only.
Is there any way to achieve versioning in D4M schema?
Thanks
Shweta
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