Cassandra/TimeWindowCompactionStrategy

This page contains historical information . "thing" has been archived

2023

TimeWindowCompactionStrategy is an alternative to DateTieredCompactionStrategy , developed by Jeff Jirsa . It ships with Cassandra 3.0.7 and later, (where DateTieredCompactionStrategy has been officially deprecated). For Cassandra versions < 3.0.7, it is possible to install time-window compaction out-of-tree.

Source

Wikimedia maintains a Github branch of the repository, with the Maven pom.xml patched to deploy the jar to archiva.wikimedia.org .

Deployment

The compaction strategy is deployed from https://gerrit.wikimedia.org/r/#/admin/projects/operations/software/cassandra-twcs via Scap .

Updating the deploy repo

The deploy repository makes use of git-fat to sync the jar file to a working copy from Archiva, as necessary. If you need to deploy a new version of the strategy, the basic steps are:

Build, and deploy to Archiva with Maven.

$ cat ~/.m2/settings.xml
<settings>
  <servers>
    <server>
      <id>wikimedia.releases</id>
      <username>archiva-deploy</username>
      <password>PASSWORD_GOES_HERE</password>
    </server>
    <server>
      <id>wikimedia.snapshots</id>
      <username>archiva-deploy</username>
      <password>PASSWORD_GOES_HERE</password>
    </server>
  </servers>
</settings>
$ mvn deploy
...

Update the operations/software/cassandra-twcs with the jar
```
$ cp /path/to/twcs/target/TimeWindowCompactionStrategy.jar lib/cassandra-v2.2
$ git add lib/cassandra-v2.2/TimeWindowCompactionStrategy.jar
$ git commit -m 'Adding TimeWindowCompactionStrategy.jar via git-fat'
```
Note: Make sure that the jar you add to git is the same one uploaded in #1 (checksums should be matching). See Adding an artifact to your project for additional information.
Deploy to the Cassandra nodes (see https://doc.wikimedia.org/mw-tools-scap/ )
Update the Cassandra classpath entries as necessary ( cassandra::extra_classpath in Puppet hiera)