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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: [RELEASE] Apache Cassandra 1.0 released
Date Tue, 18 Oct 2011 13:45:33 GMT
Multiple concurrent schema modifications are not supported in 1.0.
https://issues.apache.org/jira/browse/CASSANDRA-1391 is open to add
this in 1.1.

On Tue, Oct 18, 2011 at 8:27 AM, Dikang Gu <dikang85@gmail.com> wrote:
> Congrats!
> In 0.8, the schema disagreement occurs sometimes when I create
> keyspaces/column families dynamically, is this also fixed?
> Regards.
>
> On Tue, Oct 18, 2011 at 9:20 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>
>> Short version: yes, 1.0 addresses the known repair problems.
>>
>> On Tue, Oct 18, 2011 at 7:29 AM, Maxim Potekhin <potekhin@bnl.gov> wrote:
>> > There was a problem in early 0.8 where the repair was taking
>> > forever -- am I right to assume this was fixed in 1.0?
>> >
>> > Many thanks to you guys,
>> >
>> > Maxim
>> >
>> >
>> > On 10/18/2011 2:25 PM, Thibaut Britz wrote:
>> >>
>> >> Great news!
>> >>
>> >> Especially the improved read performance and compactions are great!
>> >>
>> >> Thanks,
>> >> Thibaut
>> >>
>> >>
>> >> On Tue, Oct 18, 2011 at 2:11 PM, Jonathan Ellis<jbellis@gmail.com>
>> >>  wrote:
>> >>>
>> >>> Thanks for the help, everyone!  This is a great milestone for
>> >>> Cassandra.
>> >>>
>> >>> On Tue, Oct 18, 2011 at 7:01 AM, Sylvain
>> >>> Lebresne<sylvain@datastax.com>
>> >>>  wrote:
>> >>>>
>> >>>> The Cassandra team is very pleased to announce the release of Apache
>> >>>> Cassandra
>> >>>> version 1.0.0. Cassandra 1.0.0 is a new major release that build
upon
>> >>>> the
>> >>>> awesomeness of previous versions and adds numerous improvements[1,2],
>> >>>> amongst
>> >>>> which:
>> >>>>  - Compression of on-disk data files (SSTables), with checksummed
>> >>>> blocks
>> >>>> to
>> >>>>    protect against bitrot[4].
>> >>>>  - Improvements to memory management through off-heap caches, arena
>> >>>>    allocation and automatic self-tuning, for less GC pauses and
more
>> >>>>    predictable performances[5].
>> >>>>  - Better disk-space management: better control of the space taken
by
>> >>>> commit
>> >>>>    logs and immediate deletion of obsolete data files.
>> >>>>  - New optional leveled compaction strategy with more predictable
>> >>>> performance
>> >>>>    and fixed sstable size[6].
>> >>>>  - Improved hinted handoffs, leading to less need for read repair
for
>> >>>>    better read performances.
>> >>>>  - Lots of improvements to performance[7], CQL, repair, easier
>> >>>> operation,
>> >>>>    etc[8]...
>> >>>>
>> >>>> And as is the rule for some time now, rolling upgrades from previous
>> >>>> versions
>> >>>> are supported, so there is nothing stopping you to get all those
>> >>>> goodies
>> >>>> right
>> >>>> now!
>> >>>>
>> >>>> Both source and binary distributions of Cassandra 1.0.0 can be
>> >>>> downloaded at:
>> >>>>
>> >>>>  http://cassandra.apache.org/download/
>> >>>>
>> >>>> Or you can use the debian package available from the project APT
>> >>>> repository[3]
>> >>>> (you will need to use the 10x series).
>> >>>>
>> >>>> The download page also link to the CQL drivers that, from this
>> >>>> release
>> >>>> on, are
>> >>>> maintained out of tree[9].
>> >>>>
>> >>>>
>> >>>> That's all folks!
>> >>>>
>> >>>> [1]: http://goo.gl/t3qpw (CHANGES.txt)
>> >>>> [2]: http://goo.gl/6t0qN (NEWS.txt)
>> >>>> [3]: http://wiki.apache.org/cassandra/DebianPackaging
>> >>>> [4]:
>> >>>>
>> >>>> http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-compression
>> >>>> [5]:
>> >>>>
>> >>>> http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-improved-memory-and-disk-space-management
>> >>>> [6]:
>> >>>>
>> >>>> http://www.datastax.com/dev/blog/leveled-compaction-in-apache-cassandra
>> >>>> [7]:
>> >>>>
>> >>>> http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-performance
>> >>>> [8]:
>> >>>>
>> >>>> http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-windows-service-new-cql-clients-and-more
>> >>>> [9]: http://acunu.com/blogs/eric-evans/cassandra-drivers-released/
>> >>>>
>> >>>
>> >>>
>> >>> --
>> >>> 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
>
>
>
> --
> Dikang Gu
> 0086 - 18611140205
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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