Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-6293

Issues with OIV processing PB-based fsimages

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 2.4.0
    • Fix Version/s: 2.5.0
    • Component/s: None
    • Labels:
      None
    • Target Version/s:
    • Hadoop Flags:
      Reviewed
    • Release Note:
      Hide
      Set "dfs.namenode.legacy-oiv-image.dir" to an appropriate directory to make standby name node or secondary name node save its file system state in the old fsimage format during checkpointing. This image can be used for offline analysis using the OfflineImageViewer. Use the "hdfs oiv_legacy" command to process the old fsimage format.
      Show
      Set "dfs.namenode.legacy-oiv-image.dir" to an appropriate directory to make standby name node or secondary name node save its file system state in the old fsimage format during checkpointing. This image can be used for offline analysis using the OfflineImageViewer. Use the "hdfs oiv_legacy" command to process the old fsimage format.

      Description

      There are issues with OIV when processing fsimages in protobuf.

      Due to the internal layout changes introduced by the protobuf-based fsimage, OIV consumes excessive amount of memory. We have tested with a fsimage with about 140M files/directories. The peak heap usage when processing this image in pre-protobuf (i.e. pre-2.4.0) format was about 350MB. After converting the image to the protobuf format on 2.4.0, OIV would OOM even with 80GB of heap (max new size was 1GB). It should be possible to process any image with the default heap size of 1.5GB.

      Another issue is the complete change of format/content in OIV's XML output. I also noticed that the secret manager section has no tokens while there were unexpired tokens in the original image (pre-2.4.0). I did not check whether they were also missing in the new pb fsimage.

        Attachments

        1. Heap Histogram.html
          137 kB
          Kihwal Lee
        2. HDFS-6293.000.patch
          19 kB
          Haohui Mai
        3. HDFS-6293.001.patch
          20 kB
          Haohui Mai
        4. HDFS-6293.002-save-deprecated-fsimage.patch
          61 kB
          Haohui Mai
        5. HDFS-6293_sbn_ckpt_retention.patch
          66 kB
          Kihwal Lee
        6. HDFS-6293_sbn_ckpt_retention_oiv_legacy.patch
          157 kB
          Kihwal Lee
        7. HDFS-6293.trunk.patch
          163 kB
          Kihwal Lee
        8. HDFS-6293.branch-2.patch
          163 kB
          Kihwal Lee
        9. HDFS-6293.trunk.patch
          163 kB
          Kihwal Lee
        10. HDFS-6293.v2.branch-2.patch
          162 kB
          Kihwal Lee
        11. HDFS-6293.v2.trunk.patch
          163 kB
          Kihwal Lee

          Issue Links

            Activity

              People

              • Assignee:
                kihwal Kihwal Lee
                Reporter:
                kihwal Kihwal Lee
              • Votes:
                0 Vote for this issue
                Watchers:
                18 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: