Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-5474

Deletesnapshot can make Namenode in safemode on NN restarts.

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.3.0
    • Component/s: snapshots
    • Labels:
      None
    • Target Version/s:
    • Hadoop Flags:
      Reviewed

      Description

      When we deletesnapshot, we are deleting the blocks associated to that snapshot and after that we do logsync to editlog about deleteSnapshot.
      There can be a chance that blocks removed from blocks map but before log sync if there is BR , NN may finds that block does not exist in blocks map and may invalidate that block. As part HB, invalidation info also can go. After this steps if Namenode shutdown before actually do logsync, On restart it will still consider that snapshot Inodes and expect blocks to report from DN.

      Simple solution is, we should simply move down that blocks removal after logsync only. Similar to delete op.

        Attachments

        1. HDFS-5474-002.patch
          2 kB
          Vinayakumar B
        2. HDFS-5474-001.patch
          2 kB
          sathish

          Issue Links

            Activity

              People

              • Assignee:
                sathish.gurram sathish
                Reporter:
                umamaheswararao Uma Maheswara Rao G
              • Votes:
                0 Vote for this issue
                Watchers:
                7 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: