[HADOOP-4228] dfs datanode metrics, bytes_read, bytes_written overflows due to incorrect type used.

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.18.2, 0.19.0
• Fix Version/s: 0.18.2
• Component/s: metrics

Environment

Red Hat Enterprise Linux AS release 4 (Nahant Update 5), Java 1.6.

• Hadoop Flags: Incompatible change, Reviewed
• Release Note: Changed bytes_read, bytes_written to type long to prevent metrics overflow.
• Assignee: Eric Yang
• Reporter: Eric Yang
• Created: 19/Sep/08 23:45
• Updated: 04/Nov/08 18:48
• Resolved: 13/Oct/08 07:23

Description

bytes_read, and bytes_written metrics are using int (MetricsTimeVaryingInt) as counter. This type is too small to store the bytes_read and bytes_written metrics. Recommend to change this to long (metricsLongValue).