Uploaded image for project: 'Hadoop Common'
  1. Hadoop Common
  2. HADOOP-1463

dfs.datanode.du.reserved semantics being violated

VotersWatch issueWatchersCreate sub-taskLinkCloneUpdate Comment AuthorReplace String in CommentUpdate Comment VisibilityDelete Comments
    XMLWordPrintableJSON

Details

    • Bug
    • Status: Closed
    • Blocker
    • Resolution: Fixed
    • 0.15.3, 0.16.0
    • 0.15.0
    • None
    • None

    Description

      Currently namenode reports two statistics back to the client:
      1. The total capacity of dfs. This is a sum of all datanode's capacities, each of which is calculated by datanode summing all data directories disk space.
      2. The total remaining space of dfs. This is a sum of all datanodes's remaining space. Each datanode's remaining space is calculated by using the following formula: remaining space = unused space - capacity*unusableDiskPercentage - reserved space. So the remaining space shows how much space that the dfs can still use, but it does not show the size of unused space.

      Each dfs client caculates the total dfs used space by substracting remaining space from the total capacity. So the used space does not accurately shows the space that dfs is using. However it is a very important number that dfs should provide.

      Attachments

        1. usedSpace.patch
          35 kB
          Hairong Kuang
        2. usedSpace.patch
          35 kB
          Hairong Kuang

        Issue Links

        Activity

          This comment will be Viewable by All Users Viewable by All Users
          Cancel

          People

            hairong Hairong Kuang
            hairong Hairong Kuang
            Votes:
            0 Vote for this issue
            Watchers:
            1 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Slack

                Issue deployment