[HDFS-11371] Document missing metrics of erasure coding

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha2
• Fix Version/s: 3.0.0-alpha4
• Component/s: documentation, erasure-coding
• Target Version/s: 3.0.0-alpha4
• Hadoop Flags: Reviewed
• Assignee: Yiqun Lin
• Reporter: Yiqun Lin
• Created: 26/Jan/17 02:41
• Updated: 04/Feb/17 04:03
• Resolved: 04/Feb/17 03:04

Description

HDFS-8411, HDFS-11216 add some metrics of erasure coding, but it hasn't been documented. The following metrics in DataNodeMetrics is missing in documentation.

  @Metric("Count of erasure coding reconstruction tasks")
  MutableCounterLong ecReconstructionTasks;
  @Metric("Count of erasure coding failed reconstruction tasks")
  MutableCounterLong ecFailedReconstructionTasks;
  @Metric("Nanoseconds spent by decoding tasks")
  MutableCounterLong ecDecodingTimeNanos;
  @Metric("Bytes read by erasure coding worker")
  MutableCounterLong ecReconstructionBytesRead;
  @Metric("Bytes written by erasure coding worker")
  MutableCounterLong ecReconstructionBytesWritten;
  @Metric("Bytes remote read by erasure coding worker")
  MutableCounterLong ecReconstructionRemoteBytesRead;

Issue Links

• relates to: HDFS-7674 [umbrella] Adding metrics for Erasure Coding
• relates to: HDFS-11216 Add remoteBytesRead counter metrics for erasure coding reconstruction task