[HDFS-11494] Log message when DN is not selected for block replication

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha2
• Fix Version/s: 2.9.0, 3.0.0-alpha4
• Target Version/s: 2.9.0, 3.0.0-alpha4
• Hadoop Flags: Reviewed
• Assignee: Yiqun Lin
• Reporter: Yiqun Lin
• Created: 03/Mar/17 13:17
• Updated: 24/Apr/18 20:46
• Resolved: 04/Mar/17 02:50

Description

In HDFS-8946, a important message was removed.

if (requiredSize > remaining - scheduledSize) {
      logNodeIsNotChosen(storage, "the node does not have enough "
          + storage.getStorageType() + " space"
          + " (required=" + requiredSize
          + ", scheduled=" + scheduledSize
          + ", remaining=" + remaining + ")");
      return false;
    }

This log is important since it can tell us why DN is not selected for block replication. And it will be good for us to debug issues.

Issue Links

• relates to: HDFS-8946 Improve choosing datanode storage for block placement