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.

  public void testDelete() throws Exception {
    Connector c = new MockConnector("root", new MockInstance());
    c.tableOperations().create("test");
    BatchWriter bw = c.createBatchWriter("test", new BatchWriterConfig());
    
    Mutation m1 = new Mutation("r1");
    
    m1.put("cf1", "cq1", 1, "v1");
    
    bw.addMutation(m1);
    bw.flush();
    
    Mutation m2 = new Mutation("r1");
    
    m2.putDelete("cf1", "cq1", 2);
    
    bw.addMutation(m2);
    bw.flush();
    
    Scanner scanner = c.createScanner("test", Constants.NO_AUTHS);

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    deleter.delete();
    this.checkRemaining(c, "test", 0);
    
    // test deleting just one row
    BatchWriter writer = c.createBatchWriter("test", new BatchWriterConfig());
    Mutation m = new Mutation("r1");
    m.put("fam", "qual", "value");
    writer.addMutation(m);
    
    // make sure the write goes through
    writer.flush();
    writer.close();
    
    deleter.setRanges(Collections.singletonList(new Range(("r1"))));
    deleter.delete();
    this.checkRemaining(c, "test", 0);
    
    // test multi row deletes
    writer = c.createBatchWriter("test", new BatchWriterConfig());
    m = new Mutation("r1");
    m.put("fam", "qual", "value");
    writer.addMutation(m);
    Mutation m2 = new Mutation("r2");
    m2.put("fam", "qual", "value");
    writer.addMutation(m2);
    
    // make sure the write goes through
    writer.flush();
    writer.close();

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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 < 10; i++) {
      Mutation m1 = new Mutation("r" + i);
      m1.put("cf1", "cq1", 1, "v" + i);
      bw.addMutation(m1);
    }
    
    bw.flush();
    
    int count = 10;
    
    Scanner scanner = c.createScanner("test", Constants.NO_AUTHS);
    for (Entry<Key,Value> entry : scanner) {
      Key key = entry.getKey();
      Mutation m = new Mutation(key.getRow());
      m.put(key.getColumnFamily().toString(), key.getColumnQualifier().toString(), key.getTimestamp() + 1, "v" + (count));
      count++;
      bw.addMutation(m);
    }
    
    bw.flush();

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  public void testMockMultiTableBatchWriter() throws Exception {
    Connector c = new MockConnector("root", new MockInstance());
    c.tableOperations().create("a");
    c.tableOperations().create("b");
    MultiTableBatchWriter bw = c.createMultiTableBatchWriter(new BatchWriterConfig());
    Mutation m1 = new Mutation("r1");
    m1.put("cf1", "cq1", 1, "v1");
    BatchWriter b = bw.getBatchWriter("a");
    b.addMutation(m1);
    b.flush();
    b = bw.getBatchWriter("b");
    b.addMutation(m1);

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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 < 10; i++) {
      Mutation m = new Mutation("r1");
      m.put("cf1", "cq1", "" + i);
      bw.addMutation(m);
    }
    
    bw.close();

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  static Key nk(int r, int c) {
    return new Key(new Text(FastFormat.toZeroPaddedString(r, 9, 10, ROW_PREFIX)), new Text(FastFormat.toZeroPaddedString(c, 6, 10, COL_PREFIX)));
  }
  
  static Mutation nm(int r) {
    return new Mutation(new Text(FastFormat.toZeroPaddedString(r, 9, 10, ROW_PREFIX)));
  }

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    long tps = System.currentTimeMillis();
    
    if (nm != null) {
      for (int i = 0; i < numRows; i++) {
        int row = rand.nextInt(1000000000);
        Mutation m = nm(row);
        for (int j = 0; j < numCols; j++) {
          int col = rand.nextInt(1000000);
          Value val = new Value("test".getBytes(Constants.UTF8));
          pc(m, col, val);
        }

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    try {
      Iterator<Entry<Key,Value>> iter = super.iterator();
      while (iter.hasNext()) {
        Entry<Key,Value> next = iter.next();
        Key k = next.getKey();
        Mutation m = new Mutation(k.getRow());
        m.putDelete(k.getColumnFamily(), k.getColumnQualifier(), new ColumnVisibility(k.getColumnVisibility()), k.getTimestamp());
        writer.addMutation(m);
      }
    } finally {
      writer.close();
    }

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            for (Entry<KeyExtent,List<Mutation>> entry : tabMuts.entrySet()) {
              long size = 0;
              Iterator<Mutation> iter = entry.getValue().iterator();
              while (iter.hasNext()) {
                while (size < MUTATION_BATCH_SIZE && iter.hasNext()) {
                  Mutation mutation = iter.next();
                  updates.add(mutation.toThrift());
                  size += mutation.numBytes();
                }
                
                client.applyUpdates(tinfo, usid, entry.getKey().toThrift(), updates);
                updates.clear();
                size = 0;

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          Key key = importIterator.getTopKey();
          Value value = importIterator.getTopValue();
          if (setTime) {
            key.setTimestamp(time);
          }
          Mutation mutation = new Mutation(key.getRow());
          if (!key.isDeleted()) {
            mutation.put(key.getColumnFamily(), key.getColumnQualifier(), new ColumnVisibility(key.getColumnVisibilityData().toArray()), key.getTimestamp(),
                value);
          } else {
            mutation.putDelete(key.getColumnFamily(), key.getColumnQualifier(), new ColumnVisibility(key.getColumnVisibilityData().toArray()),
                key.getTimestamp());
          }
          table.addMutation(mutation);
          importIterator.next();
        }

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