HBase client API summary

Single Put	HTable table = new HTable(conf, "testtable"); Put put = new Put(Bytes.toBytes("row1")); put.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"), Bytes.toBytes("val1")); put.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual2"), Bytes.toBytes("val2")); table.put(put);
MultiPut(cache)	table.setAutoFlush(false) table.put... table.put... table.put.... table.flushCommits();	Put can fail on exception. That why on catch better to do flushCommits();
MultiPut(batch)	List<Put> puts = new ArrayList<Put>(); Put put1 = new Put(Bytes.toBytes("row1")); put1.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"), Bytes.toBytes("val1")); puts.add(put1); Put put2 = new Put(Bytes.toBytes("row2")); put2.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"), Bytes.toBytes("val2")); puts.add(put2); Put put3 = new Put(Bytes.toBytes("row2")); put3.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual2"), Bytes.toBytes("val3")); puts.add(put3); table.put(puts);
SingleGet	Get get = new Get(Bytes.toBytes("row1")); get.addColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1")); Result result = table.get(get);
MultiGet	List<Get> gets = new ArrayList<Get>(); Get get1 = new Get(row1); get1.addColumn(cf1, qf1); gets.add(get1); Get get2 = new Get(row2); get2.addColumn(cf1, qf1); gets.add(get2); Get get3 = new Get(row2); get3.addColumn(cf1, qf2); gets.add(get3); Result[] results = table.get(gets);
Delete(Single)	Delete delete = new Delete(Bytes.toBytes("row1")); delete.deleteFamily(Bytes.toBytes("colfam3")); table.delete(delete);
Delete(Multi)	List<Delete> deletes = new ArrayList<Delete>(); Delete delete1 = new Delete(Bytes.toBytes("row1")); delete1.setTimestamp(4); deletes.add(delete1); Delete delete2 = new Delete(Bytes.toBytes("row2")); delete2.deleteColumn(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1")); delete2.deleteColumns(Bytes.toBytes("colfam2"), Bytes.toBytes("qual3"), 5); deletes.add(delete2); Delete delete3 = new Delete(Bytes.toBytes("row3")); delete3.deleteFamily(Bytes.toBytes("colfam1")); delete3.deleteFamily(Bytes.toBytes("colfam2"), 3); deletes.add(delete3); table.delete(deletes);
Batch	List<Row> batch = new ArrayList<Row>(); Put put = new Put(ROW2); put.add(COLFAM2, QUAL1, Bytes.toBytes("val5")); batch.add(put); Get get1 = new Get(ROW1); get1.addColumn(COLFAM1, QUAL1); batch.add(get1); Delete delete = new Delete(ROW1); delete.deleteColumns(COLFAM1, QUAL2); batch.add(delete); Object[] results = new Object[batch.size()]; try { table.batch(batch, results); } catch (Exception e) { System.err.println("Error: " + e);
Scan	Scan scan1 = new Scan(); ResultScanner scanner1 = table.getScanner(scan1); for (Result res : scanner1) { System.out.println(res); } scanner1.close();	So far, each call to next() will be a separate RPC for each row—even when you use the next(int nbRows) method, because it is nothing else but a client-side loop over next() calls Thus it would make sense to fetch more than one row per RPC if possible	Cache - number of rows scan.setCaching(caching); batch - number of columns scan.setBatch(batch);