Details

    • Type: New Feature
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.94.0, 0.95.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
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      Tool to replay WAL files using a M/R job.

      The WAL can be replayed for a set of tables or all tables, and a timerange can be provided (in milliseconds).
      The WAL is filtered to this set of tables, the output can optionally be mapped to another set of tables.

      WAL replay can also generate HFiles for later bulk importing, in that case the WAL is replayed for a single table only.
      Show
      Tool to replay WAL files using a M/R job. The WAL can be replayed for a set of tables or all tables, and a timerange can be provided (in milliseconds). The WAL is filtered to this set of tables, the output can optionally be mapped to another set of tables. WAL replay can also generate HFiles for later bulk importing, in that case the WAL is replayed for a single table only.

      Description

      Just an idea I had. Might be useful for restore of a backup using the HLogs.
      This could an M/R (with a mapper per HLog file).

      The tool would get a timerange and a (set of) table(s). We'd pick the right HLogs based on time before the M/R job is started and then have a mapper per HLog file.
      The mapper would then go through the HLog, filter all WALEdits that didn't fit into the time range or are not any of the tables and then uses HFileOutputFormat to generate HFiles.
      Would need to indicate the splits we want, probably from a live table.

        Attachments

        1. HLog-5604-v3.txt
          16 kB
          Lars Hofhansl
        2. 5604-v4.txt
          24 kB
          Lars Hofhansl
        3. 5604-v6.txt
          29 kB
          Lars Hofhansl
        4. 5604-v7.txt
          29 kB
          Lars Hofhansl
        5. 5604-v8.txt
          34 kB
          Lars Hofhansl
        6. 5604-v9.txt
          36 kB
          Lars Hofhansl
        7. 5604-v10.txt
          36 kB
          Lars Hofhansl
        8. 5604-v11.txt
          37 kB
          Lars Hofhansl

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              • Assignee:
                lhofhansl Lars Hofhansl
                Reporter:
                lhofhansl Lars Hofhansl
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                • Created:
                  Updated:
                  Resolved: