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 <dikan...@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 <jbel...@gmail.com> wrote: >> >> Short version: yes, 1.0 addresses the known repair problems. >> >> On Tue, Oct 18, 2011 at 7:29 AM, Maxim Potekhin <potek...@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<jbel...@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<sylv...@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
