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  1. HBase
  2. HBASE-26276

Allow HashTable/SyncTable to perform rawScan when comparing cells

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 3.0.0-alpha-1, 2.2.7, 2.5.0, 2.3.6, 2.4.6
    • Fix Version/s: 2.5.0, 2.2.8, 3.0.0-alpha-2, 2.3.7, 2.4.7
    • Component/s: None
    • Labels:
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    • Release Note:
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      Added --rawScan option to HashTable job, which allows HashTable/SyncTable to perform raw scans. If this property is omitted, it defaults to false. When used together with --versions set to a high value, SyncTable will fabricate delete markers to all old versions still hanging (not cleaned yet by major compaction), avoiding the inconsistencies reported in HBASE-21596.
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      Added --rawScan option to HashTable job, which allows HashTable/SyncTable to perform raw scans. If this property is omitted, it defaults to false. When used together with --versions set to a high value, SyncTable will fabricate delete markers to all old versions still hanging (not cleaned yet by major compaction), avoiding the inconsistencies reported in HBASE-21596 .

      Description

      We had noticed some of our customers having inconsistent results when running HashTable/SyncTable in scenarios described previously by HBASE-21596. As discussed on HBASE-21596, one alternative to avoid such inconsistencies, is to set 'NEW_VERSION_BEHAVIOUR' introduced by HBASE-15968. That, however, does rely on the order of operations, which can't be guaranteed when standard replication (not serial replication) is being used, which is the case on the majority of our customers.

      A possible workaround is to place delete markers to every single cell version returned on a raw scan, and setting a high value to the scan number of versions to be read.

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              • Assignee:
                wchevreuil Wellington Chevreuil
                Reporter:
                wchevreuil Wellington Chevreuil
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                  Updated:
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