Examples of org.apache.accumulo.core.data.Mutation

org.apache.accumulo.core.data.Mutation

Mutation represents an action that manipulates a row in a table. A mutation holds a list of column/value pairs that represent an atomic set of modifications to make to a row.
Convenience methods which takes columns and value as CharSequence (String implements CharSequence) are provided. CharSequence is converted to UTF-8 by constructing a new Text object.
When always passing in the same data as a CharSequence/String, its probably more efficient to call the Text put methods. This way the data is only encoded once and only one Text object is created.
All of the put methods append data to the mutation, they do not overwrite anything that was previously put. The mutation holds a list of all column/values that were put into it. The putDelete() methods do not remove something that was previously added to the mutation, rather they indicate that Accumulo should insert a delete marker for that row column.

        } else {
          rowid = i;
        }
        
        Text row = generateRow(rowid, opts.startRow);
        Mutation m = new Mutation(row);
        for (int j = 0; j < opts.cols; j++) {
          Text colf = new Text(opts.columnFamily);
          Text colq = new Text(FastFormat.toZeroPaddedString(j, 7, 10, COL_PREFIX));
          
          if (writer != null) {
            Key key = new Key(row, colf, colq, labBA);
            if (opts.timestamp >= 0) {
              key.setTimestamp(opts.timestamp);
            } else {
              key.setTimestamp(startTime);
            }
            
            if (opts.delete) {
              key.setDeleted(true);
            } else {
              key.setDeleted(false);
            }
            
            bytesWritten += key.getSize();
            
            if (opts.delete) {
              writer.append(key, new Value(new byte[0]));
            } else {
              byte value[];
              if (opts.random != null) {
                value = genRandomValue(random, randomValue, opts.random.intValue(), rowid + opts.startRow, j);
              } else {
                value = bytevals[j % bytevals.length];
              }
              
              Value v = new Value(value);
              writer.append(key, v);
              bytesWritten += v.getSize();
            }
            
          } else {
            Key key = new Key(row, colf, colq, labBA);
            bytesWritten += key.getSize();
            
            if (opts.delete) {
              if (opts.timestamp >= 0)
                m.putDelete(colf, colq, opts.columnVisibility, opts.timestamp);
              else
                m.putDelete(colf, colq, opts.columnVisibility);
            } else {
              byte value[];
              if (opts.random != null) {
                value = genRandomValue(random, randomValue, opts.random.intValue(), rowid + opts.startRow, j);
              } else {
                value = bytevals[j % bytevals.length];
              }
              bytesWritten += value.length;
              
              if (opts.timestamp >= 0) {
                m.put(colf, colq, opts.columnVisibility, opts.timestamp, new Value(value, true));
              } else {
                m.put(colf, colq, opts.columnVisibility, new Value(value, true));
                
              }
            }
          }

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      exception = null;
    }
  }
  
  void removeFromMetadataTable() throws Exception {
    Mutation m = new Mutation(new Text("~err_" + tableName));
    m.putDelete(new Text(problemType.name()), new Text(resource));
    MetadataTable.getMetadataTable(SecurityConstants.getSystemCredentials()).update(m);
  }

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    m.putDelete(new Text(problemType.name()), new Text(resource));
    MetadataTable.getMetadataTable(SecurityConstants.getSystemCredentials()).update(m);
  }
  
  void saveToMetadataTable() throws Exception {
    Mutation m = new Mutation(new Text("~err_" + tableName));
    m.put(new Text(problemType.name()), new Text(resource), new Value(encode()));
    MetadataTable.getMetadataTable(SecurityConstants.getSystemCredentials()).update(m);
  }

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    testLotsOfOverwrites();
    testLotsOfGetsAndScans();
  }
  
  private static void put(NativeMap nm, String row, String val, int mc) {
    Mutation m = new Mutation(new Text(row));
    m.put(new Text(), new Text(), Long.MAX_VALUE, new Value(val.getBytes(Constants.UTF8)));
    nm.mutate(m, mc);
  }

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    BatchWriter bw = uconn.createBatchWriter("table1", new BatchWriterConfig());
    
    UUID uuid = UUID.randomUUID();
    
    Mutation m = new Mutation(uuid.toString());
    m.put("META", "SIZE", new ColumnVisibility("A|B"), "8");
    m.put("META", "CRC", new ColumnVisibility("A|B"), "456");
    m.put("META", "COUNT", new ColumnVisibility("A|B"), "1");
    m.put("DATA", "IMG", new ColumnVisibility("A&B"), "ABCDEFGH");
    
    bw.addMutation(m);
    bw.flush();
    
    m = new Mutation(uuid.toString());
    m.put("META", "COUNT", new ColumnVisibility("A|B"), "1");
    m.put("META", "CRC", new ColumnVisibility("A|B"), "123");
    bw.addMutation(m);
    
    bw.close();
    
    int count = 0;

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    conn.tableOperations().setProperty("table2", Property.TABLE_CLASSPATH.getKey(), "cx1");
    conn.tableOperations().attachIterator("table2", new IteratorSetting(100, "foocensor", "org.apache.accumulo.test.FooFilter"));
    
    BatchWriter bw = conn.createBatchWriter("table2", new BatchWriterConfig());
    
    Mutation m1 = new Mutation("foo");
    m1.put("cf1", "cq1", "v2");
    m1.put("cf1", "cq2", "v3");
    
    bw.addMutation(m1);
    
    Mutation m2 = new Mutation("bar");
    m2.put("cf1", "cq1", "v6");
    m2.put("cf1", "cq2", "v7");
    
    bw.addMutation(m2);
    
    bw.close();

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    BatchWriter bw = null;
    
    // Add some data
    try {
      bw = c.createBatchWriter(table, new BatchWriterConfig());
      Mutation m = new Mutation("a");
      for (int i = 0; i < 50; i++) {
        m.put("colf", Integer.toString(i), "");
      }
      
      bw.addMutation(m);
    } finally {
      if (null != bw) {

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    Logger.getLogger(ZooConfiguration.class).setLevel(Level.OFF);
    Logger.getLogger(HdfsZooInstance.class).setLevel(Level.OFF);
  }
  
  public void mutate(InMemoryMap imm, String row, String column, long ts) {
    Mutation m = new Mutation(new Text(row));
    String[] sa = column.split(":");
    m.putDelete(new Text(sa[0]), new Text(sa[1]), ts);
    
    imm.mutate(Collections.singletonList(m));
  }

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    imm.mutate(Collections.singletonList(m));
  }
  
  public void mutate(InMemoryMap imm, String row, String column, long ts, String value) {
    Mutation m = new Mutation(new Text(row));
    String[] sa = column.split(":");
    m.put(new Text(sa[0]), new Text(sa[1]), ts, new Value(value.getBytes()));
    
    imm.mutate(Collections.singletonList(m));
  }

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  }
  
  public void testDuplicateKey() throws Exception {
    InMemoryMap imm = new InMemoryMap(false, System.getProperty("user.dir") + "/target");
    
    Mutation m = new Mutation(new Text("r1"));
    m.put(new Text("foo"), new Text("cq"), 3, new Value("v1".getBytes()));
    m.put(new Text("foo"), new Text("cq"), 3, new Value("v2".getBytes()));
    imm.mutate(Collections.singletonList(m));
    
    MemoryIterator skvi1 = imm.skvIterator();
    skvi1.seek(new Range(), LocalityGroupUtil.EMPTY_CF_SET, false);
    ae(skvi1, "r1", "foo:cq", 3, "v2");

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