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Rolling restart with upgrades or configuration changes

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Rolling restart with upgrades or configuration changes

Champion Alumni

Hi All,

 

  1. Is a rolling upgrade possible   if I  use rpms  as my local repository or is it mandatory that  parcels are required for this?.
  2. Similary if I  make a configuartion change and need a rolling start I  think  the only thing I would need is HDFS high availability to restart the  full cluster.(I dont think  it has anything to do with parcels/rpms).

Could some one please confirm.

1 REPLY 1
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Re: Rolling restart with upgrades or configuration changes

Expert Contributor

Hi Nishan,

 

1a. Yes! See the documentation for performing a Rolling Upgrade

1b. Rolling Restarts are a function made possible by using parcels, not rpm/deb packages. Cloudera Manager does not present Rolling options for clusters that do not use parcels. 

2. Good question. There is a concept of a Service-Level Rolling Restart, and a Cluster-Level Rolling Restart. The documentation link above elaborates:

 

"If you have HDFS High Availability enabled, you can also perform a cluster-level rolling restart. At the cluster level, the rolling restart of slave nodes is performed on a host-by-host basis, rather than per service, to avoid all roles for a service potentially being down at the same time. You cannot perform a cluster-level rolling restart unless you have High Availability enabled. However, you can perform a rolling restart on individual services, including HDFS.
Note that JobTracker High Availability is not required for a cluster-level rolling restart.

If you have HDFS High Availability, then in order to avoid having your NameNode (and thus the cluster) go down during the restart, Cloudera Manager will force a failover to the Standby NameNode while the critical roles are being restarted. If you have JobTracker High Availability enabled, Cloudera Manager will force a failover to the Standby JobTracker while the critical roles are being restarted."

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