Uploaded image for project: 'Kudu'
  1. Kudu
  2. KUDU-1380

Scanners rewind to beginning of the tablet on SERVER_TOO_BUSY

Attach filesAttach ScreenshotVotersWatch issueWatchersCreate sub-taskLinkCloneUpdate Comment AuthorReplace String in CommentUpdate Comment VisibilityDelete Comments
    XMLWordPrintableJSON

Details

    • Bug
    • Status: Resolved
    • Blocker
    • Resolution: Fixed
    • 0.7.1
    • 0.8.0
    • None
    • None

    Description

      When a scanner receives ERROR_SERVER_TOO_BUSY from an overloaded TS, the CanBeRetried() function indicates that it is safe to retry. However, this ends up calling through to ReopenCurrentTablet() which rewinds back to the start of the tablet in the case that the scan wasn't marked as fault-tolerant.

      In the case of a lot of concurrent TPCH Q6 queries via Impala, this ended up resulting in "never-ending" queries - each scanner was likely to hit the occasional TOO_BUSY error and start back at the beginning.

      Attachments

        Issue Links

        Activity

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

          People

            tlipcon Todd Lipcon
            tlipcon Todd Lipcon
            Votes:
            0 Vote for this issue
            Watchers:
            2 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Slack

                Issue deployment