You must restart Cassandra nodes after completing data center maintenance or when there
is an unplanned data center outage.
About this task
You must restart the seed nodes first, followed by the non-seed nodes.
Procedure
To restart Cassandra nodes, complete the following steps:
-
On each Cassandra node in the data center you are bringing back online, go to the
<installDir>/MailboxUtilities/bin/ directory, and run the
startGMData script.
<InstallDIR> is the directory where Cassandra and ZooKeeper nodes are
installed.
- Optional:
Wait for the Cassandra Reaper to complete a repair before proceeding. On
a well-maintained Cassandra cluster, a repair operation may take several hours to complete
successfully. For details, refer to Checking repair status.
Important: Skipping the step allows you to bring your data center online much faster.
However, by allowing the repair to complete before proceeding, you can ensure that trading partners
have immediate access to data created or modified during the maintenance period. Because the repair
operation is resource-intensive, operations executed on any machines running Cassandra might be
slower during the repair interval. Completing the step mitigates this concern as well.