Author: gourksaha Date: Tue May 19 15:41:14 2015 New Revision: 1680321 URL: http://svn.apache.org/r1680321 Log: CMS commit to slider by gourksaha
Modified: incubator/slider/site/trunk/content/docs/slider_specs/application_pkg_upgrade.md Modified: incubator/slider/site/trunk/content/docs/slider_specs/application_pkg_upgrade.md URL: http://svn.apache.org/viewvc/incubator/slider/site/trunk/content/docs/slider_specs/application_pkg_upgrade.md?rev=1680321&r1=1680320&r2=1680321&view=diff ============================================================================== --- incubator/slider/site/trunk/content/docs/slider_specs/application_pkg_upgrade.md (original) +++ incubator/slider/site/trunk/content/docs/slider_specs/application_pkg_upgrade.md Tue May 19 15:41:14 2015 @@ -38,19 +38,19 @@ Automated application package upgrade wi ## Phases of Upgrade/Downgrade #### YARN core (libraries and configurations) upgrade/downgrade -> Running Slider apps will continue to run, with no downtime + Running Slider apps will continue to run, with no downtime #### Slider client upgrade/downgrade -> Does not affect running Slider apps at all. New version of client can co-exist with older versions of client. + Does not affect running Slider apps at all. New version of client can co-exist with older versions of client. #### Slider Application Master upgrade/downgrade of running applications -> Applications started prior to the start of YARN core upgrade/downgrade, will continue to run with the + Applications started prior to the start of YARN core upgrade/downgrade, will continue to run with the older versions of Slider core and Hadoop libraries. There is no support for rolling upgrade of Slider AM. To upgrade running Slider AMs, the application needs to be stopped and restarted with the new version of the client. #### Applications deployed by Slider (binaries and configurations) upgrade/downgrade -> This is the what this document is primarily about. + This is the what this document is primarily about. ## Upgrade Slider Application Packages @@ -171,7 +171,7 @@ Downgrade is done when the following com ## Pre and post upgrade hooks ### Pre-upgrade hook (optional) -> The pre-upgrade steps, if provided, will allow applications to execute simple housekeeping tasks + The pre-upgrade steps, if provided, will allow applications to execute simple housekeeping tasks before Slider actually calls stop operation in an upgrade scenario (specifically if they need to be performed in every single container and 1000s of them are running). An example could be to send a message to a queue that the current instance of memcached is going down so that the load @@ -182,13 +182,13 @@ pre-upgrade hook is not a good candidate to be exposed, like timeout, which can be used to wait at most n seconds (say) after which Slider will call the application stop hook even if the pre-upgrade operation is not completed. -> Use `app-packages/hbase/package/scripts/hbase_master.py` as a sample for defining the + Use `app-packages/hbase/package/scripts/hbase_master.py` as a sample for defining the pre-upgrade hook. Note, the pre-upgrade hook will be triggered only if the currently running application has been created using Slider verion `0.80.0-incubating` or later and the scripts in the package has the pre-upgrade hook defined. ### Post-upgrade hook (optional) - `not yet supported` -> This allows applications to perform simple housekeeping tasks prior to calling start on the new + This allows applications to perform simple housekeeping tasks prior to calling start on the new version of the application component. This is helpful only if such tasks are required to be performed in every single container and 1000s of them are running. This hook will be triggered only in the upgrade scenario. It will not be called on new containers created using flex up, in non-upgrade