[HBASE-8530] Refine error message from ExportSnapshot when there is leftover snapshot in target cluster

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.98.0, 0.94.8, 0.95.1
• Hadoop Flags: Reviewed
• Assignee: Ted Yu
• Reporter: Ted Yu
• Created: 11/May/13 03:04
• Updated: 04/Jun/13 00:06
• Resolved: 13/May/13 14:39

Description

ExportSnapshot performs the following validation check before starting export:

    // Check if the snapshot already in-progress
    if (outputFs.exists(snapshotTmpDir)) {
      System.err.println("A snapshot with the same name '" + snapshotName + "' is in-progress");
      return 1;
    }

The intention was to prevent concurrent snapshot export when snapshot with the same name may be outstanding.
Here is sample output:

hbase@ip-10-165-36-226 root$ hbase org.apache.hadoop.hbase.snapshot.ExportSnapshot -snapshot snapone -copy-to hdfs://10.12.113.22:8020/apps/hbase/data -mappers 1
A snapshot with the same name 'snapone' is in-progress

We should note the actual path in the error message so that user can check whether the snapshot with same name is still pending.