Examples of org.apache.hadoop.hbase.client.Delete

org.apache.hadoop.hbase.client.Delete
Used to perform Delete operations on a single row.
To delete an entire row, instantiate a Delete object with the row to delete. To further define the scope of what to delete, perform additional methods as outlined below.
To delete specific families, execute {@link #deleteFamily(byte[]) deleteFamily}for each family to delete.
To delete multiple versions of specific columns, execute {@link #deleteColumns(byte[],byte[]) deleteColumns}for each column to delete.
To delete specific versions of specific columns, execute {@link #deleteColumn(byte[],byte[],long) deleteColumn}for each column version to delete.
Specifying timestamps, deleteFamily and deleteColumns will delete all versions with a timestamp less than or equal to that passed. If no timestamp is specified, an entry is added with a timestamp of 'now' where 'now' is the servers's System.currentTimeMillis(). Specifying a timestamp to the deleteColumn method will delete versions only with a timestamp equal to that specified. If no timestamp is passed to deleteColumn, internally, it figures the most recent cell's timestamp and adds a delete at that timestamp; i.e. it deletes the most recently added cell.
The timestamp passed to the constructor is used ONLY for delete of rows. For anything less -- a deleteColumn, deleteColumns or deleteFamily -- then you need to use the method overrides that take a timestamp. The constructor timestamp is not referenced.

          HBaseFsck.debugLsr(conf, p);
        }


        if (metaRow) {
          HTable meta = new HTable(conf, HConstants.META_TABLE_NAME);
          Delete delete = new Delete(deleteRow);
          meta.delete(delete);
        }
      }
      LOG.info(hri.toString() + hsa.toString());
    }

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      // Delete daughter regions from meta, but not hdfs, unassign it.
      Map<HRegionInfo, ServerName> hris = tbl.getRegionLocations();
      undeployRegion(admin, hris.get(daughters.getFirst()), daughters.getFirst());
      undeployRegion(admin, hris.get(daughters.getSecond()), daughters.getSecond());


      meta.delete(new Delete(daughters.getFirst().getRegionName()));
      meta.delete(new Delete(daughters.getSecond().getRegionName()));
      meta.flushCommits();


      HBaseFsck hbck = doFsck(conf, false);
      assertErrors(hbck, new ERROR_CODE[] {ERROR_CODE.NOT_IN_META_OR_DEPLOYED,
          ERROR_CODE.NOT_IN_META_OR_DEPLOYED, ERROR_CODE.HOLE_IN_REGION_CHAIN}); //no LINGERING_SPLIT_PARENT

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   * @param writeToWAL
   * @throws IOException
   */
  void delete(Map<byte[], List<KeyValue>> familyMap, UUID clusterId,
      boolean writeToWAL) throws IOException {
    Delete delete = new Delete();
    delete.setFamilyMap(familyMap);
    delete.setClusterId(clusterId);
    delete.setWriteToWAL(writeToWAL);
    internalDelete(delete, clusterId, writeToWAL);
  }

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          // originating cluster. A slave cluster receives the result as a Put
          // or Delete
          if (isPut) {
            internalPut(((Put) w), HConstants.DEFAULT_CLUSTER_ID, writeToWAL);
          } else {
            Delete d = (Delete)w;
            prepareDelete(d);
            internalDelete(d, HConstants.DEFAULT_CLUSTER_ID, writeToWAL);
          }
          return true;
        }

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            if (coprocessorHost.prePut((Put) m, walEdit, m.getWriteToWAL())) {
              // by pass everything
              return;
            }
          } else if (m instanceof Delete) {
            Delete d = (Delete) m;
            prepareDelete(d);
            if (coprocessorHost.preDelete(d, walEdit, d.getWriteToWAL())) {
              // by pass everything
              return;
            }
          }
        }
      }


      long txid = 0;
      boolean walSyncSuccessful = false;
      boolean locked = false;


      // 2. acquire the row lock(s)
      acquiredLocks = new ArrayList<Integer>(rowsToLock.size());
      for (byte[] row : rowsToLock) {
        // attempt to lock all involved rows, fail if one lock times out
        Integer lid = getLock(null, row, true);
        if (lid == null) {
          throw new IOException("Failed to acquire lock on "
              + Bytes.toStringBinary(row));
        }
        acquiredLocks.add(lid);
      }


      // 3. acquire the region lock
      this.updatesLock.readLock().lock();
      locked = true;


      // 4. Get a mvcc write number
      MultiVersionConsistencyControl.WriteEntry w = mvcc.beginMemstoreInsert();


      long now = EnvironmentEdgeManager.currentTimeMillis();
      byte[] byteNow = Bytes.toBytes(now);
      try {
        // 5. Check mutations and apply edits to a single WALEdit
        for (Mutation m : mutations) {
          if (m instanceof Put) {
            Map<byte[], List<KeyValue>> familyMap = m.getFamilyMap();
            checkFamilies(familyMap.keySet());
            checkTimestamps(familyMap, now);
            updateKVTimestamps(familyMap.values(), byteNow);
          } else if (m instanceof Delete) {
            Delete d = (Delete) m;
            prepareDelete(d);
            prepareDeleteTimestamps(d.getFamilyMap(), byteNow);
          } else {
            throw new DoNotRetryIOException(
                "Action must be Put or Delete. But was: "
                    + m.getClass().getName());
          }

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      Map<byte[], List<Row>> rows = new TreeMap<byte[], List<Row>>(Bytes.BYTES_COMPARATOR);
      for (HLog.Entry entry : entries) {
        WALEdit edit = entry.getEdit();
        byte[] table = entry.getKey().getTablename();
        Put put = null;
        Delete del = null;
        KeyValue lastKV = null;
        List<KeyValue> kvs = edit.getKeyValues();
        for (KeyValue kv : kvs) {
          if (lastKV == null || lastKV.getType() != kv.getType() || !lastKV.matchingRow(kv)) {
            if (kv.isDelete()) {
              del = new Delete(kv.getRow());
              del.setClusterId(entry.getKey().getClusterId());
              addToMultiMap(rows, table, del);
            } else {
              put = new Put(kv.getRow());
              put.setClusterId(entry.getKey().getClusterId());
              addToMultiMap(rows, table, put);
            }
          }
          if (kv.isDelete()) {
            del.addDeleteMarker(kv);
          } else {
            put.add(kv);
          }
          lastKV = kv;
        }

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    // delete some rows
    random = new Random(10121986L);  // pseudo random order of row insertions
    for (long i = 0; i < numRows; i++) {
      byte[] rowId = Bytes.toBytes(random.nextLong() + "." + i);
      if (i % 10 == 7) {
        Delete delete = new Delete(rowId, timestamp, null);
        region.delete(delete, null, true);
      }
    }


    checkIndexedScanWithDeletedRows(family, false, 7L, 0);
    checkIndexedScanWithDeletedRows(family, false, 6L, 8L, 2 * numRows / 5);


    /**
     * Flush and verify
     */
    region.flushcache();


    checkIndexedScanWithDeletedRows(family, true, 7L, 0);
    checkIndexedScanWithDeletedRows(family, true, 6L, 8L, 2 * numRows / 5);


    /**
     * New check - now the index should find the 4's  and the memstore
     * should only contains deleted rows - override the index's findings
     */
    checkIndexedScanWithDeletedRows(family, true, 4L, numRows / 5);
    checkIndexedScanWithDeletedRows(family, true, 3L, 8L, numRows);


    timestamp++;


    random = new Random(10121986L);  // pseudo random order of row insertions
    for (long i = 0; i < numRows; i++) {
      byte[] rowId = Bytes.toBytes(random.nextLong() + "." + i);
      if (i % 10 == 4) {
        Delete delete = new Delete(rowId, timestamp, null);
        region.delete(delete, null, true);
      }
    }


    checkIndexedScanWithDeletedRows(family, false, 4L, 0);

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      more = scanner.next(results);
      if (results != null && !results.isEmpty())
        count++;
      else
        break;
      Delete delete = new Delete(results.get(0).getRow());
      delete.deleteColumn(Bytes.toBytes("trans-tags"), Bytes.toBytes("qual2"));
      r.delete(delete, null, false);
      results.clear();
    } while (more);
    assertEquals("Did not perform correct number of deletes", 3, count);
  }

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    put = new Put(row);
    put.add(fam, serverinfo, Bytes.toBytes("ip_address"));
    region.put(put);


    // ok now delete a split:
    Delete delete = new Delete(row);
    delete.deleteColumns(fam, splitA);
    region.delete(delete, null, true);


    // assert some things:
    Get get = new Get(row).addColumn(fam, serverinfo);
    Result result = region.get(get, null);

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    Put put = new Put(row);
    put.add(fam, serverinfo, HConstants.LATEST_TIMESTAMP-5,Bytes.toBytes("value"));
    region.put(put);


    // now delete something in the present
    Delete delete = new Delete(row);
    region.delete(delete, null, true);


    // make sure we still see our data
    Get get = new Get(row).addColumn(fam, serverinfo);
    Result result = region.get(get, null);
    assertEquals(1, result.size());
    
    // delete the future row
    delete = new Delete(row,HConstants.LATEST_TIMESTAMP-3,null);
    region.delete(delete, null, true);


    // make sure it is gone
    get = new Get(row).addColumn(fam, serverinfo);
    result = region.get(get, null);

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