[HDFS-4059] Add number of stale DataNodes to metrics

• Type: Sub-task
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 2.0.3-alpha
• Component/s: datanode, namenode
• 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: 15/Oct/12 22:58
• Updated: 12/May/16 18:12
• Resolved: 16/Oct/12 19:49

Description

Add the number of stale DataNodes to metrics.

Issue Links

• relates to: HDFS-4071 Add number of stale DataNodes to metrics for Branch-1