[HADOOP-1597] Distributed upgrade status reporting and post upgrade features.

• Type: New Feature
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.14.0
• Fix Version/s: 0.14.0
• Assignee: Konstantin Shvachko
• Reporter: Konstantin Shvachko
• Created: 12/Jul/07 00:10
• Updated: 02/May/13 02:29
• Resolved: 16/Jul/07 17:43

Description

This patch introduces 2 additional features to the distributed upgrade framework,
which turned out to be useful for the crc upgrade HADOOP-1134.
1. I introduce a DFSAdmin command
-upgradeProgress status | details | force
which retrieves current upgrade status, or its detailed status, or forces the upgrade to proceed if it is stuck.
2. If a data-node misses an upgrade it can still join the cluster if the respective upgrade object implements
postUpgradeAction() method.

The framework provides a default implementation of the features.
For (1) any upgrade object returns by default a generic UpgradeStatusReport class, which contains
only the version and the current status of the upgrade.
An attempt to force the upgrade will have no effect except that the name-node will log "forceProceed() is not defined"
For (2) the default implementation leads to a data-node shutdown, which is consistent with the former behavior.

Issue Links

• is depended upon by: HADOOP-1134 Block level CRCs in HDFS