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  1. HBase
  2. HBASE-19826

Provide a option to see rows behind a delete in a time range queries

    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None

      Description

      We can provide an option (something like seePastDeleteMarkers) in a scan to let the user see the versions behind the delete marker even if keepDeletedCells is set to false in the descriptor.

      With the previous version, we workaround the same in preStoreScannerOpen hook. For reference PHOENIX-4277

      
      	    @Override
      	    public KeyValueScanner preStoreScannerOpen(final ObserverContext<RegionCoprocessorEnvironment> c,
      	        final Store store, final Scan scan, final NavigableSet<byte[]> targetCols,
      	        final KeyValueScanner s) throws IOException {
      	
      	      if (scan.isRaw() || ScanInfoUtil.isKeepDeletedCells(store.getScanInfo()) || scan.getTimeRange().getMax() == HConstants.LATEST_TIMESTAMP || TransactionUtil.isTransactionalTimestamp(scan.getTimeRange().getMax())) {
      	        return s;
      	      }
      	
      	      ScanInfo scanInfo = ScanInfoUtil.cloneScanInfoWithKeepDeletedCells(store.getScanInfo());
      	      return new StoreScanner(store, scanInfo, scan, targetCols,
      	          c.getEnvironment().getRegion().getReadpoint(scan.getIsolationLevel()));
      	    }
      
      

      Another way is to provide a way to set KEEP_DELETED_CELLS to true in ScanOptions of preStoreScannerOpen.

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              • Assignee:
                ankit@apache.org Ankit Singhal
                Reporter:
                ankit@apache.org Ankit Singhal
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                • Created:
                  Updated: