Re: how to change compare_with
Thank you. I got it from the examples provided by Hector. Vedarth Kulkarni, TYBSc (Computer Science). On Thu, Feb 3, 2011 at 6:22 AM, Jonathan Ellis wrote: > Correct. But with more and more clients being able to do intelligent > things based on metadata it's not just decoration. (UTF8Type, > LexicalUUIDType, BytesType, and AsciiType all have the same ordering. > I believe IntegerType and LongType are equivalent orderings as well.) > > On Wed, Feb 2, 2011 at 3:35 PM, Stu Hood wrote: > > Not only does the type need to make sense, but it also needs to sort in > > exactly the same order as the previous type did... in which case there > would > > be no reason to change it? > > We should probably just say "no, you cannot do this", and explicitly > prevent > > it. > > > > On Wed, Feb 2, 2011 at 3:14 PM, Jonathan Ellis > wrote: > >> > >> On Wed, Feb 2, 2011 at 3:01 PM, Tyler Hobbs wrote: > >> > I think Jonathan mispoke. > >> > >> I thought I was mistaken, but I was wrong. :) > >> > >> > You cannot change the 'compare_with' attribute of an existing column > >> > family. > >> > >> You can, but it's up to you to make sure that the new type makes > >> sense. Most frequently, you see this when changing from BytesType to > >> something more structured. > >> > >> (If you screw up and specify a compare_with that is nonsensical for > >> your data, just change it back.) > >> > >> -- > >> Jonathan Ellis > >> Project Chair, Apache Cassandra > >> co-founder of DataStax, the source for professional Cassandra support > >> http://www.datastax.com > > > > > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of DataStax, the source for professional Cassandra support > http://www.datastax.com >
Re: how to change compare_with
I tried "help update column family".
It gave me :
*valid attributes are:
- column_type: Super or Standard
- comment: Human-readable column family description. Any string is
acceptable
- rows_cached: Number or percentage of rows to cache
- row_cache_save_period: Period with which to persist the row cache, in
seconds
- keys_cached: Number or percentage of keys to cache
- key_cache_save_period: Period with which to persist the key cache, in
seconds
- read_repair_chance: Probability (0.0-1.0) with which to perform read
repairs on CL.ONE reads
- gc_grace: Discard tombstones after this many seconds
- column_metadata: null
- memtable_operations: Flush memtables after this many operations
- memtable_throughput: ... or after this many bytes have been written
- memtable_flush_after: ... or after this many seconds
- default_validation_class: null
- min_compaction_threshold: Avoid minor compactions of less than this
number of sstable files
- max_compaction_threshold: Compact no more than this number of sstable
files at once
- column_metadata: Metadata which describes columns of column family.
Supported format is [{ k:v, k:v, ... }, { ... }, ...]
Valid attributes: column_name, validation_class (see comparator),
index_type (integer), index_name.
*So what is to be used ?
And also if possible please provide information on how do that in Java using
Hector.
Thank you.
Vedarth Kulkarni,
TYBSc (Computer Science).
On Thu, Feb 3, 2011 at 2:58 AM, Jonathan Ellis wrote:
> On Wed, Feb 2, 2011 at 12:48 PM, Vedarth Kulkarni
> wrote:
> > Hello there,
> >
> > I am using Cassandra 0.7. Is there any way to change the 'compare_with'
> from
> > my program ?, I am using Hector and I am programming in Java.
>
> Yes.
>
> > Is it possible to change it from the bin/cassandra-cli ?
>
> Yes. "help update column family;"
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com
>
Re: Cassandra + Thrift on RedHat Enterprise 5
Thank you all. It is working fine with Hector. Vedarth Kulkarni, TYBSc (Computer Science). 2011/1/31 Vedarth Kulkarni > I will give it a try.. > > > Vedarth Kulkarni, > TYBSc (Computer Science). > > > > On Mon, Jan 31, 2011 at 7:59 AM, Shashank Tiwari wrote: > >> Why wouldn't you leverage Lucandra/Solandra instead of starting >> from scratch? >> >> Thanks, Shashank >> >> >> Shashank Tiwari >> web: www.shanky.org | www.treasuryofideas.com >> >> >> 2011/1/30 Wangpei (Peter) >> >> Hector document: >>> >>> http://www.riptano.com/sites/default/files/hector-v2-client-doc.pdf >>> >>> >>> >>> *发件人:* Vedarth Kulkarni [mailto:vedar...@gmail.com] >>> *发送时间:* 2011年1月30日 14:03 >>> *收件人:* user@cassandra.apache.org >>> *主题:* Re: Cassandra + Thrift on RedHat Enterprise 5 >>> >>> >>> >>> How can I use Hector please can you explain me in detail ? >>> I am new to these things. >>> >>> - >>> Vedarth Kulkarni, >>> TYBSc (Computer Science). >>> >>> >>> >>> On Sun, Jan 30, 2011 at 11:20 AM, Andrey V. Panov >>> wrote: >>> >>> Use Hector instead of pure Trift. https://github.com/rantav/hector/ >>> And checkout wiki. >>> >>> >>> >> >> >
how to change compare_with
Hello there, I am using Cassandra 0.7. Is there any way to change the 'compare_with' from my program ?, I am using Hector and I am programming in Java. OR Is it possible to change it from the bin/cassandra-cli ? Please explain me in detail if possible or suggest me a good resource on the internet. Vedarth Kulkarni, TYBSc (Computer Science).
Re: Cassandra + Thrift on RedHat Enterprise 5
I will give it a try.. Vedarth Kulkarni, TYBSc (Computer Science). On Mon, Jan 31, 2011 at 7:59 AM, Shashank Tiwari wrote: > Why wouldn't you leverage Lucandra/Solandra instead of starting > from scratch? > > Thanks, Shashank > > > Shashank Tiwari > web: www.shanky.org | www.treasuryofideas.com > > > 2011/1/30 Wangpei (Peter) > > Hector document: >> >> http://www.riptano.com/sites/default/files/hector-v2-client-doc.pdf >> >> >> >> *发件人:* Vedarth Kulkarni [mailto:vedar...@gmail.com] >> *发送时间:* 2011年1月30日 14:03 >> *收件人:* user@cassandra.apache.org >> *主题:* Re: Cassandra + Thrift on RedHat Enterprise 5 >> >> >> >> How can I use Hector please can you explain me in detail ? >> I am new to these things. >> >> - >> Vedarth Kulkarni, >> TYBSc (Computer Science). >> >> >> >> On Sun, Jan 30, 2011 at 11:20 AM, Andrey V. Panov >> wrote: >> >> Use Hector instead of pure Trift. https://github.com/rantav/hector/ >> And checkout wiki. >> >> >> > >
Re: Cassandra + Thrift on RedHat Enterprise 5
How can I use Hector please can you explain me in detail ? I am new to these things. - Vedarth Kulkarni, TYBSc (Computer Science). On Sun, Jan 30, 2011 at 11:20 AM, Andrey V. Panov wrote: > Use Hector instead of pure Trift. https://github.com/rantav/hector/ > And checkout wiki. >
Re: Cassandra + Thrift on RedHat Enterprise 5
Thank you very much. I will try and use Hector. Vedarth Kulkarni, TYBSc (Computer Science). On Sun, Jan 30, 2011 at 11:20 AM, Andrey V. Panov wrote: > Use Hector instead of pure Trift. https://github.com/rantav/hector/ > And checkout wiki. >
Cassandra + Thrift on RedHat Enterprise 5
I a student and developing a web crawler and I want to use Cassandra + Thrift. I successfully have started the Cassandra and Cassandra-cli. But when I use the source codes(JAVA) listed on the website, the program contains errors and when I modify it by referencing the Doc the program hangs. How should I go for it ? - Vedarth Kulkarni, TYBSc (Computer Science).
