org.apache.ambari.server.checks

Class ServicesUpCheck

java.lang.Object

org.apache.ambari.server.checks.ClusterCheck

org.apache.ambari.server.checks.ServicesUpCheck

All Implemented Interfaces:

org.apache.ambari.spi.upgrade.UpgradeCheck

public class ServicesUpCheck
extends ClusterCheck

The ServicesUpCheck class is used to ensure that services are up "enough" before an upgrade begins. This class uses the following rules:

• If the component is a CLIENT, it will skip it
• If the component is a MASTER then it must be online and not in MM
• If the component is a SLAVE
  • If the cardinality is 1+, then determine if % are running. Hosts in MM are counted as being "up" since they are not part of the upgrade.
  • If the cardinality is 0, then all instances must be online. Hosts in MM are counted as being "up" since they are not part of the upgrade.

It seems counter-intuitive to have a liveliness check which allows a percentage of the slaves to be down. The goal is to be able to start an upgrade, even if some slave components on healthy hosts are down. We still want hosts to be scehdule for upgrade of their other components.

Field Summary

Fields inherited from class org.apache.ambari.server.checks.ClusterCheck

clustersProvider

Constructor Summary

Constructors

Constructor and Description
ServicesUpCheck() Constructor.

Method Summary

Modifier and Type	Method and Description
org.apache.ambari.spi.upgrade.UpgradeCheckResult	perform(org.apache.ambari.spi.upgrade.UpgradeCheckRequest request)

Methods inherited from class org.apache.ambari.server.checks.ClusterCheck

formatEntityList, getApplicableServices, getCheckDescription, getDescription, getFailReason, getFailReason, getProperty, getQualifications

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ServicesUpCheck

public ServicesUpCheck()

Constructor.

Method Detail

perform

public org.apache.ambari.spi.upgrade.UpgradeCheckResult perform(org.apache.ambari.spi.upgrade.UpgradeCheckRequest request)
                                                         throws org.apache.ambari.server.AmbariException

Throws:

org.apache.ambari.server.AmbariException