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

org.apache.hadoop.hbase.client.Get
Used to perform Get operations on a single row.
To get everything for a row, instantiate a Get object with the row to get. To further define the scope of what to get, perform additional methods as outlined below.
To get all columns from specific families, execute {@link #addFamily(byte[]) addFamily}for each family to retrieve.
To get specific columns, execute {@link #addColumn(byte[],byte[]) addColumn}for each column to retrieve.
To only retrieve columns within a specific range of version timestamps, execute {@link #setTimeRange(long,long) setTimeRange}.
To only retrieve columns with a specific timestamp, execute {@link #setTimeStamp(long) setTimestamp}.
To limit the number of versions of each column to be returned, execute {@link #setMaxVersions(int) setMaxVersions}.
To add a filter, execute {@link #setFilter(Filter) setFilter}.

      hbck.setTimeLag(0);
      hbck.setFixSplitParents(true);
      hbck.onlineHbck();
      assertTrue(hbck.shouldRerun());


      Get get = new Get(hri.getRegionName());
      Result result = meta.get(get);
      assertTrue(result.getColumn(HConstants.CATALOG_FAMILY,
        HConstants.SPLITA_QUALIFIER).isEmpty());
      assertTrue(result.getColumn(HConstants.CATALOG_FAMILY,
        HConstants.SPLITB_QUALIFIER).isEmpty());

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      // overlapping regions
      HBaseFsck hbck = doFsck(conf, true, true, false, false, false, true, true, true, null);
      assertErrors(hbck, new ERROR_CODE[] {}); //no LINGERING_SPLIT_PARENT reported


      // assert that the split META entry is still there.
      Get get = new Get(hri.getRegionName());
      Result result = meta.get(get);
      assertNotNull(result);
      assertNotNull(MetaReader.parseCatalogResult(result).getFirst());


      assertEquals(ROWKEYS.length, countRows());

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      byte[] regionName = location.getRegionInfo().getRegionName();
      admin.split(location.getRegionInfo().getRegionName(), Bytes.toBytes("BM"));
      TestEndToEndSplitTransaction.blockUntilRegionSplit(
          TEST_UTIL.getConfiguration(), 60000, regionName, true);


      PairOfSameType<HRegionInfo> daughters = MetaReader.getDaughterRegions(meta.get(new Get(regionName)));


      // 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


      // now fix it. The fix should not revert the region split, but add daughters to META
      hbck = doFsck(conf, true, true, false, false, false, false, false, false, null);
      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});


      // assert that the split META entry is still there.
      Get get = new Get(hri.getRegionName());
      Result result = meta.get(get);
      assertNotNull(result);
      assertNotNull(MetaReader.parseCatalogResult(result).getFirst());


      assertEquals(ROWKEYS.length, countRows());

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      Store store = getStore(family);
      // get the closest key. (HStore.getRowKeyAtOrBefore can return null)
      KeyValue key = store.getRowKeyAtOrBefore(row);
      Result result = null;
      if (key != null) {
        Get get = new Get(key.getRow());
        get.addFamily(family);
        result = get(get, null);
      }
      if (coprocessorHost != null) {
        coprocessorHost.postGetClosestRowBefore(row, family, result);
      }

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          } else {
            kvCount.put(qual, count + 1);
          }
          count = kvCount.get(qual);


          Get get = new Get(kv.getRow());
          get.setMaxVersions(count);
          get.addColumn(family, qual);


          List<KeyValue> result = get(get, false);


          if (result.size() < count) {
            // Nothing to delete

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    startRegionOperation();
    this.writeRequestsCount.increment();
    try {
      RowLock lock = isPut ? ((Put)w).getRowLock() : ((Delete)w).getRowLock();
      Get get = new Get(row, lock);
      checkFamily(family);
      get.addColumn(family, qualifier);


      // Lock row
      Integer lid = getLock(lockId, get.getRow(), true);
      List<KeyValue> result = new ArrayList<KeyValue>();
      try {
        result = get(get, false);


        boolean valueIsNull = comparator.getValue() == null ||

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          Store store = stores.get(family.getKey());
          List<KeyValue> kvs = new ArrayList<KeyValue>(family.getValue().size());


          // Get previous values for all columns in this family
          Get get = new Get(row);
          for (KeyValue kv : family.getValue()) {
            get.addColumn(family.getKey(), kv.getQualifier());
          }
          List<KeyValue> results = get(get, false);


          // Iterate the input columns and update existing values if they were
          // found, otherwise add new column initialized to the append value

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          Store store = stores.get(family.getKey());
          List<KeyValue> kvs = new ArrayList<KeyValue>(family.getValue().size());


          // Get previous values for all columns in this family
          Get get = new Get(row);
          for (Map.Entry<byte [], Long> column : family.getValue().entrySet()) {
            get.addColumn(family.getKey(), column.getKey());
          }
          get.setTimeRange(tr.getMin(), tr.getMax());
          List<KeyValue> results = get(get, false);


          // Iterate the input columns and update existing values if they were
          // found, otherwise add new column initialized to the increment amount
          int idx = 0;

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      this.updatesLock.readLock().lock();
      try {
        Store store = stores.get(family);


        // Get the old value:
        Get get = new Get(row);
        get.addColumn(family, qualifier);


        // we don't want to invoke coprocessor in this case; ICV is wrapped
        // in HRegionServer, so we leave getLastIncrement alone
        List<KeyValue> results = get(get, false);

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    boolean res = region.checkAndPut(row1, fam1, qf1, val1, put, lockId, true);
    assertEquals(true, res);
    store.memstore.kvset.size();
    
    Get get = new Get(row1);
    get.addColumn(fam2, qf1);
    KeyValue [] actual = region.get(get, null).raw();
    
    KeyValue [] expected = {kv};
    
    assertEquals(expected.length, actual.length);

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