Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-4750 Support NFSv3 interface to HDFS
  3. HDFS-5252

Stable write is not handled correctly in someplace

    XMLWordPrintableJSON

    Details

    • Type: Sub-task
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.3.0
    • Component/s: nfs
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      When the client asks for a stable write but the prerequisite writes are not transferred to NFS gateway, the stableness can't be honored. NFS gateway has to treat the write as unstable write and set the flag to UNSTABLE in the write response.

      One bug was found during test with Ubuntu client when copying one 1KB file. For small files like 1KB file, Ubuntu client does one stable write (with FILE_SYNC flag). However, NFS gateway missed one place where(OpenFileCtx#doSingleWrite) it sends response with the flag NOT updated to UNSTABLE.

      With this bug, the client thinks the write is on disk and thus doesn't send COMMIT anymore. The following test tries to read the data back and of course fails to do so since the data was not synced.

        Attachments

        1. HDFS-5252.001.patch
          1 kB
          Brandon Li
        2. HDFS-5252.002.patch
          12 kB
          Brandon Li

          Activity

            People

            • Assignee:
              brandonli Brandon Li
              Reporter:
              brandonli Brandon Li
            • Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: