Kylin leverages HBase coprocessor to optimize query performance. After new versions released, the RPC protocol may get changed, so user need to redeploy coprocessor to HTable.
There's a CLI tool to update HBase Coprocessor:
{% highlight Groff markup %} $KYLIN_HOME/bin/kylin.sh org.apache.kylin.storage.hbase.util.DeployCoprocessorCLI default all {% endhighlight %}