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}.

    byte [] tableName = HRegionInfo.parseRegionName(regionName)[0];
    Set<MetaRegion> regions = regionManager.getMetaRegionsForTable(tableName);
    for (MetaRegion m: regions) {
      byte [] metaRegionName = m.getRegionName();
      HRegionInterface srvr = connection.getHRegionConnection(m.getServer());
      Get get = new Get(regionName);
      get.addColumn(CATALOG_FAMILY, REGIONINFO_QUALIFIER);
      get.addColumn(CATALOG_FAMILY, SERVER_QUALIFIER);
      Result data = srvr.get(metaRegionName, get);
      if(data == null || data.size() <= 0) continue;
      HRegionInfo info = Writables.getHRegionInfo(
          data.getValue(CATALOG_FAMILY, REGIONINFO_QUALIFIER));
      byte [] value = data.getValue(CATALOG_FAMILY, SERVER_QUALIFIER);

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   */
  protected Result getFromMETA(final byte [] row, final byte [] family)
  throws IOException {
    MetaRegion meta = this.regionManager.getMetaRegionForRow(row);
    HRegionInterface srvr = getMETAServer(meta);
    Get get = new Get(row);
    get.addFamily(family);
    return srvr.get(meta.getRegionName(), get);
  }

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    List<KeyValue> result = new ArrayList<KeyValue>();
    KeyComparator keyComparator = this.comparator.getRawComparator();


    KeyValue kv = null;
    // Setting up the QueryMatcher
    Get get = new Get(row);
    NavigableSet<byte[]> qualifiers =
      new TreeSet<byte[]>(Bytes.BYTES_COMPARATOR);
    qualifiers.add(qualifier);
    QueryMatcher matcher = new QueryMatcher(get, f, qualifiers, this.ttl,
      keyComparator, 1);

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    assertEquals(1, this.store.getStorefiles().size());
    // from the one we inserted up there, and a new one
    assertEquals(2, this.store.memstore.kvset.size());


    // how many key/values for this row are there?
    Get get = new Get(row);
    get.addColumn(family, qf1);
    get.setMaxVersions(); // all versions.
    List<Cell> results = new ArrayList<Cell>();


    results = HBaseTestingUtility.getFromStoreFile(store, get);
    assertEquals(2, results.size());

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    // the second TS should be TS=2 or higher., even though 'time=1' right now.




    // how many key/values for this row are there?
    Get get = new Get(row);
    get.addColumn(family, qf1);
    get.setMaxVersions(); // all versions.
    List<Cell> results = new ArrayList<Cell>();


    results = HBaseTestingUtility.getFromStoreFile(store, get);
    assertEquals(2, results.size());

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    for(Cell kv : kvList2) {
      this.store.add(KeyValueUtil.ensureKeyValue(kv));
    }


    List<Cell> result;
    Get get = new Get(Bytes.toBytes(1));
    get.addColumn(family,qf1);


    get.setTimeRange(0,15);
    result = HBaseTestingUtility.getFromStoreFile(store, get);
    assertTrue(result.size()>0);


    get.setTimeRange(40,90);
    result = HBaseTestingUtility.getFromStoreFile(store, get);
    assertTrue(result.size()>0);


    get.setTimeRange(10,45);
    result = HBaseTestingUtility.getFromStoreFile(store, get);
    assertTrue(result.size()>0);


    get.setTimeRange(80,145);
    result = HBaseTestingUtility.getFromStoreFile(store, get);
    assertTrue(result.size()>0);


    get.setTimeRange(1,2);
    result = HBaseTestingUtility.getFromStoreFile(store, get);
    assertTrue(result.size()>0);


    get.setTimeRange(90,200);
    result = HBaseTestingUtility.getFromStoreFile(store, get);
    assertTrue(result.size()==0);
  }

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  private void assertICV(byte [] row,
                         byte [] familiy,
                         byte[] qualifier,
                         long amount) throws IOException {
    // run a get and see?
    Get get = new Get(row);
    get.addColumn(familiy, qualifier);
    Result result = region.get(get);
    assertEquals(1, result.size());


    Cell kv = result.rawCells()[0];
    long r = Bytes.toLong(CellUtil.cloneValue(kv));

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              a.add(fam1, qual1, val);
              a.add(fam1, qual2, val);
              a.add(fam2, qual3, val);
              region.append(a);


              Get g = new Get(row);
              Result result = region.get(g);
              assertEquals(result.getValue(fam1, qual1).length, result.getValue(fam1, qual2).length); 
              assertEquals(result.getValue(fam1, qual1).length, result.getValue(fam2, qual3).length); 
            } catch (IOException e) {
              e.printStackTrace();
              failures.incrementAndGet();
              fail();
            }
          }
        }
      };
    }


    // run all threads
    for (int i = 0; i < numThreads; i++) {
      all[i].start();
    }


    // wait for all threads to finish
    for (int i = 0; i < numThreads; i++) {
      try {
        all[i].join();
      } catch (InterruptedException e) {
      }
    }
    assertEquals(0, failures.get());
    Get g = new Get(row);
    Result result = region.get(g);
    assertEquals(result.getValue(fam1, qual1).length, 10000);
    assertEquals(result.getValue(fam1, qual2).length, 10000);
    assertEquals(result.getValue(fam2, qual3).length, 10000);
  }

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                rm.add(p);
              }
              region.mutateRow(rm);
              op ^= true;
              // check: should always see exactly one column
              Get g = new Get(row);
              Result r = region.get(g);
              if (r.size() != 1) {
                LOG.debug(r);
                failures.incrementAndGet();
                fail();

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          inc.addColumn(fam1, qual2, amount*2);
          inc.addColumn(fam2, qual3, amount*3);
          region.increment(inc);


          // verify: Make sure we only see completed increments
          Get g = new Get(row);
          Result result = region.get(g);
          assertEquals(Bytes.toLong(result.getValue(fam1, qual1))*2, Bytes.toLong(result.getValue(fam1, qual2))); 
          assertEquals(Bytes.toLong(result.getValue(fam1, qual1))*3, Bytes.toLong(result.getValue(fam2, qual3)));
        } catch (IOException e) {
          e.printStackTrace();

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