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.

        e.execute(new Runnable() {
          @Override
          public void run() {
            while (System.currentTimeMillis() - now < 1000) {
              for (int k = 0; k < 1000; k++) {
                Mutation m = new Mutation("row");
                m.put("cf", "cq", new Value("v".getBytes()));
                List<Mutation> mutations = Collections.singletonList(m);
                imm.mutate(mutations);
                counts[threadId]++;
              }
            }

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  }


  final static String METADATA_TABLE_DIR = "/" + Constants.METADATA_TABLE_ID;
  private static void putMarkerDeleteMutation(final String delete, final BatchWriter writer, final BatchWriter rootWriter) throws MutationsRejectedException {
    if (delete.startsWith(METADATA_TABLE_DIR)) {
      Mutation m = new Mutation(new Text(Constants.METADATA_DELETE_FLAG_FOR_METADATA_PREFIX + delete));
      m.putDelete(EMPTY_TEXT, EMPTY_TEXT);
      rootWriter.addMutation(m);
    } else {
      Mutation m = new Mutation(new Text(Constants.METADATA_DELETE_FLAG_PREFIX + delete));
      m.putDelete(EMPTY_TEXT, EMPTY_TEXT);
      writer.addMutation(m);
    }
  }

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        if (lastLog == null || !lastLog.equals(entry.getValue().toString()))
          System.out.println("Log : " + entry.getValue());
        lastLog = entry.getValue().toString();
      } else if (entry.getKey().getColumnQualifier().toString().equals("mut")) {
        DataInputStream dis = new DataInputStream(new ByteArrayInputStream(entry.getValue().get()));
        Mutation m = new Mutation();
        m.readFields(dis);
        
        LogFileValue lfv = new LogFileValue();
        lfv.mutations = Collections.singletonList(m);
        
        System.out.println(LogFileValue.format(lfv, 1));
        
        List<ColumnUpdate> columnsUpdates = m.getUpdates();
        for (ColumnUpdate cu : columnsUpdates) {
          if (Constants.METADATA_PREV_ROW_COLUMN.equals(new Text(cu.getColumnFamily()), new Text(cu.getColumnQualifier())) && count > 0) {
            System.out.println("Saw change to prevrow, stopping printing events.");
            break loop1;
          }

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    MockInstance mockInstance = new MockInstance(INSTANCE_NAME);
    Connector c = mockInstance.getConnector("root", new PasswordToken(""));
    c.tableOperations().create(TEST_TABLE_1);
    BatchWriter bw = c.createBatchWriter(TEST_TABLE_1, new BatchWriterConfig());
    for (int i = 0; i < 100; i++) {
      Mutation m = new Mutation(new Text(String.format("%09x", i + 1)));
      m.put(new Text(), new Text(), new Value(String.format("%09x", i).getBytes()));
      bw.addMutation(m);
    }
    bw.close();
    
    MRTester.main(new String[] {"root", "", TEST_TABLE_1});

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      }
      
      byte[] serMut = WritableUtils.toByteArray(m);
      
      if (prevRow != null) {
        Mutation createEvent = new Mutation(new Text(m.getRow()));
        createEvent.put(prevRow, new Text(String.format("%020d", timestamp)), new Value(metaTablet.toString().getBytes(Constants.UTF8)));
        context.write(CREATE_EVENTS_TABLE, createEvent);
      }
      
      Mutation tabletEvent = new Mutation(new Text(m.getRow()));
      tabletEvent.put(new Text(String.format("%020d", timestamp)), new Text("mut"), new Value(serMut));
      tabletEvent.put(new Text(String.format("%020d", timestamp)), new Text("mtab"), new Value(metaTablet.toString().getBytes(Constants.UTF8)));
      tabletEvent.put(new Text(String.format("%020d", timestamp)), new Text("log"), new Value(logFile.getBytes(Constants.UTF8)));
      context.write(TABLET_EVENTS_TABLE, tabletEvent);
    }

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    Connector conn = instance.getConnector(credential.getPrincipal(), CredentialHelper.extractToken(credential));
    BatchWriter bw = conn.createBatchWriter(Constants.METADATA_TABLE_NAME, new BatchWriterConfig());
    for (String line : metadata) {
      String[] parts = line.split(" ");
      String[] columnParts = parts[1].split(":");
      Mutation m = new Mutation(parts[0]);
      m.put(new Text(columnParts[0]), new Text(columnParts[1]), new Value(parts[2].getBytes()));
      bw.addMutation(m);
    }
    
    for (String line : deletes) {
      Mutation m = new Mutation(line);
      m.put("", "", "");
      bw.addMutation(m);
    }
    bw.close();
  }

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  class Receiver implements Iface {
    @Override
    public void span(RemoteSpan s) throws TException {
      String idString = Long.toHexString(s.traceId);
      String startString = Long.toHexString(s.start);
      Mutation spanMutation = new Mutation(new Text(idString));
      Mutation indexMutation = new Mutation(new Text("idx:" + s.svc + ":" + startString));
      long diff = s.stop - s.start;
      indexMutation.put(new Text(s.description), new Text(s.sender), new Value((idString + ":" + Long.toHexString(diff)).getBytes(Constants.UTF8)));
      ByteArrayTransport transport = new ByteArrayTransport();
      TCompactProtocol protocol = new TCompactProtocol(transport);
      s.write(protocol);
      String parentString = Long.toHexString(s.parentId);
      if (s.parentId == Span.ROOT_SPAN_ID)
        parentString = "";
      put(spanMutation, "span", parentString + ":" + Long.toHexString(s.spanId), transport.get(), transport.len());
      // Map the root span to time so we can look up traces by time
      Mutation timeMutation = null;
      if (s.parentId == Span.ROOT_SPAN_ID) {
        timeMutation = new Mutation(new Text("start:" + startString));
        put(timeMutation, "id", idString, transport.get(), transport.len());
      }
      try {
        final BatchWriter writer = TraceServer.this.writer.get();
        /* Check for null, because we expect spans to come in much faster than flush calls.

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    Connector c = new MockConnector("root", new MockInstance());
    c.tableOperations().create("test");
    BatchWriter bw = c.createBatchWriter("test", new BatchWriterConfig());
    for (int i = 0; i < 100; i++) {
      int r = random.nextInt();
      Mutation m = new Mutation(asText(r));
      m.put(asText(random.nextInt()), asText(random.nextInt()), new Value(Integer.toHexString(r).getBytes()));
      bw.addMutation(m);
    }
    bw.close();
    BatchScanner s = c.createBatchScanner("test", Constants.NO_AUTHS, 2);
    s.setRanges(Collections.singletonList(new Range()));

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      Assert.fail("addMutations should throw IAE for null iterable");
    } catch (IllegalArgumentException iae) {}


    bw.addMutations(Collections.<Mutation>emptyList());


    Mutation bad = new Mutation("bad");
    try {
      bw.addMutation(bad);
      Assert.fail("addMutation should throw IAE for empty mutation");
    } catch (IllegalArgumentException iae) {}




    Mutation good = new Mutation("good");
    good.put(asText(random.nextInt()), asText(random.nextInt()), new Value("good".getBytes()));
    List<Mutation> mutations = new ArrayList<Mutation>();
    mutations.add(good);
    mutations.add(bad);
    try {
      bw.addMutations(mutations);

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    c.tableOperations().attachIterator(table, is);
    String keys[][] = { {"foo", "day", "20080101"}, {"foo", "day", "20080101"}, {"foo", "day", "20080103"}, {"bar", "day", "20080101"},
        {"bar", "day", "20080101"},};
    BatchWriter bw = c.createBatchWriter("perDayCounts", new BatchWriterConfig());
    for (String elt[] : keys) {
      Mutation m = new Mutation(new Text(elt[0]));
      m.put(new Text(elt[1]), new Text(elt[2]), new Value("1".getBytes()));
      bw.addMutation(m);
    }
    bw.close();
    
    Scanner s = c.createScanner("perDayCounts", Constants.NO_AUTHS);

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