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  1. HBase
  2. HBASE-9905

Enable using seqId as timestamp

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Details

    • New Feature
    • Status: Closed
    • Major
    • Resolution: Abandoned
    • None
    • None
    • None
    • None

    Description

      This has been discussed previously, and Lars H. was mentioning an idea from the client to declare whether timestamps are used or not explicitly.

      The problem is that, for data models not using timestamps, we are still relying on clocks to order the updates. Clock skew, same milisecond puts after deletes, etc can cause unexpected behavior and data not being visible.

      We should have a table descriptor / family property, which would declare that the data model does not use timestamps. Then we can populate this dimension with the seqId, so that global ordering of edits are not effected by wall clock.

      For example, META will use this.

      Once we have something like this, we can think of making it default for new tables, so that the unknowing user will not shoot herself in the foot.

      Attachments

        1. HBaseTimespaceGeneratorProposal.pdf
          97 kB
          Andrey Stepachev

        Issue Links

          is related to

          Brainstorming - A place to record back and forth on notions not yet formed enough to make a 'New Feature' or 'Task' HBASE-8770 deletes and puts with the same ts should be resolved according to mvcc/seqNum

          • Blocker - Blocks development and/or testing work, production could not run
          • Closed

          Brainstorming - A place to record back and forth on notions not yet formed enough to make a 'New Feature' or 'Task' HBASE-10247 Client promises about timestamps

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          relates to

          New Feature - A new feature of the product, which has yet to be developed. HBASE-14070 Hybrid Logical Clocks for HBase

          • Major - Major loss of function.
          • Reopened

          Improvement - An improvement or enhancement to an existing feature or task. HBASE-8763 Combine MVCC and SeqId

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              Unassigned Unassigned
              enis Enis Soztutar
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              Dates

                Created:
                Updated:
                Resolved: