[HDFS-4071] Add number of stale DataNodes to metrics for Branch-1

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.2.0
• Fix Version/s: 1.2.0
• Component/s: datanode, namenode
• Target Version/s: 1.2.0, 2.0.3-alpha
• Hadoop Flags: Reviewed

Release Note

This jira adds a new metric with name "StaleDataNodes" under metrics context "dfs" of type Gauge. This tracks the number of DataNodes marked as stale. A DataNode is marked stale when the heartbeat message from the DataNode is not received within the configured time ""dfs.namenode.stale.datanode.interval".


Please see hdfs-default.xml documentation corresponding to "dfs.namenode.stale.datanode.interval" for more details on how to configure this feature. When this feature is not configured, this metrics would return zero.

• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 17/Oct/12 17:55
• Updated: 15/May/13 05:16
• Resolved: 18/Oct/12 20:50

Description

Backport HDFS-4059 to branch-1.

Issue Links

• is related to: HDFS-4059 Add number of stale DataNodes to metrics