Now that comparators can be changed I am internally wondering if every column, rowkey,value in c* should be a dynamic composite and then everything can "evolve"
On Fri, May 17, 2013 at 5:35 AM, Todd Fast <t...@toddfast.com> wrote: > Hi Blair-- > > Thanks for digging into the code. I did indeed experiment with longer > timeouts and the result was that trying to obtain the lock hung for > whatever amount of time I set the timeout for. I am not an expert on > Astyanax and haven't debugged my use of that recipe yet; I don't even know > if I've configured it correctly. Perhaps you have some guidance? > > (Funny you mention your own migration framework--Mutagen is the second one > I've done for Cassandra. The first one, a plugin for Mokol, also had schema > rollbacks and some other features, but was only command-line.) > > > On Thu, May 16, 2013 at 11:06 PM, Blair Zajac <bl...@orcaware.com> wrote: > >> On 5/16/13 10:22 PM, Todd Fast wrote: >> >>> Mutagen Cassandra is a framework providing schema versioning and >>> mutation for Apache Cassandra. It is similar to Flyway for SQL databases. >>> >>> https://github.com/toddfast/**mutagen-cassandra<https://github.com/toddfast/mutagen-cassandra> >>> >>> Mutagen is a lightweight framework for applying versioned changes (known >>> as mutations) to a resource, in this case a Cassandra schema. Mutagen >>> takes into account the resource's existing state and only applies >>> changes that haven't yet been applied. >>> >> >> Hi Todd, >> >> Looking at your code and you have the ColumnPrefixDistributedRowLock >> commented out. Could it be that the mutation is taking longer than a >> second to run? Are they only happening during testing simultaneous >> updates? Maybe they aren't being cleaned up? >> >> Funny timing, I'm working on porting Scala Migrations [1] to Cassandra >> and have a working implementation. It's not as fancy as Scala Migrations >> (it doesn't scan a package for migration subclasses and it currently >> doesn't do rollbacks) but it gets the basics done. Hoping to release code >> in the near future. >> >> Differences from Mutagen: >> >> 1) Mutations are written only in Scala. >> 2) Since its a new project, it uses a Java Driver session instead of a >> Astyanax connection since I only intend to use CQL3 tables. >> >> Blair >> >> [1] >> http://code.google.com/p/**scala-migrations/<http://code.google.com/p/scala-migrations/> >> > >
