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Re: upgrading from 2.x TWCS to 3.x TWCS


you are right, it won't even compile: 

[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /Users/bspindler/src/github/twcs/src/main/java/com/jeffjirsa/cassandra/db/compaction/TimeWindowCompactionStrategy.java:[110,90] cannot find symbol
  symbol:   method getOverlappingSSTables(org.apache.cassandra.db.lifecycle.SSTableSet,java.util.Set<org.apache.cassandra.io.sstable.format.SSTableReader>)
  location: variable cfs of type org.apache.cassandra.db.ColumnFamilyStore
[ERROR] /Users/bspindler/src/github/twcs/src/main/java/com/jeffjirsa/cassandra/db/compaction/TimeWindowCompactionStrategy.java:[150,99] cannot find symbol
  symbol:   class SizeComparator
  location: class org.apache.cassandra.io.sstable.format.SSTableReader
[ERROR] /Users/bspindler/src/github/twcs/src/main/java/com/jeffjirsa/cassandra/db/compaction/TimeWindowCompactionStrategy.java:[330,59] cannot find symbol
  symbol:   class SizeComparator
  location: class org.apache.cassandra.io.sstable.format.SSTableReader
[ERROR] /Users/bspindler/src/github/twcs/src/main/java/com/jeffjirsa/cassandra/db/compaction/SizeTieredCompactionStrategy.java:[104,67] cannot find symbol
  symbol:   class SizeComparator
  location: class org.apache.cassandra.io.sstable.format.SSTableReader
[INFO] 4 errors



On Fri, Nov 2, 2018 at 2:52 PM Jeff Jirsa <jjirsa@xxxxxxxxx> wrote:
There’s a chance it will fail to work - possible method signatures changed between 3.0 and 3.11. Try it in a test cluster before prod


-- 
Jeff Jirsa


On Nov 2, 2018, at 11:49 AM, Brian Spindler <brian.spindler@xxxxxxxxx> wrote:

Nevermind, I spoke to quickly.  I can change the cass version in the pom.xml and re compile, thanks! 

On Fri, Nov 2, 2018 at 2:38 PM Brian Spindler <brian.spindler@xxxxxxxxx> wrote:
<image.png>


On Fri, Nov 2, 2018 at 2:34 PM Jeff Jirsa <jjirsa@xxxxxxxxx> wrote:
Easiest approach is to build the 3.11 jar from my repo, upgrade, then ALTER table to use the official TWCS (org.apache.cassandra) jar

Sorry for the headache. I hope I have a 3.11 branch for you.


-- 
Jeff Jirsa


On Nov 2, 2018, at 11:28 AM, Brian Spindler <brian.spindler@xxxxxxxxx> wrote:

Hi all, we're planning an upgrade from 2.1.5->3.11.3 and currently we have several column families configured with twcs class 'com.jeffjirsa.cassandra.db.compaction.TimeWindowCompactionStrategy' and with 3.11.3 we need to set it to 'TimeWindowCompactionStrategy'  

Is that a safe operation?  Will cassandra even start if the column family has a compaction strategy defined with a classname it cannot resolve?  
How to deal with different versioned nodes and different class names during the upgrade of the binaries throughout the cluster?  

Thank you for any guidance, 
Brian