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.

    BatchWriter bw = conn.createBatchWriter(Constants.METADATA_TABLE_NAME, new BatchWriterConfig());
    for (Entry<Key,Value> entry : mscanner) {
      log.debug("Looking at entry " + entry + " with tid " + tid);
      if (Long.parseLong(entry.getValue().toString()) == tid) {
        log.debug("deleting entry " + entry);
        Mutation m = new Mutation(entry.getKey().getRow());
        m.putDelete(entry.getKey().getColumnFamily(), entry.getKey().getColumnQualifier());
        bw.addMutation(m);
      }
    }
    bw.close();
  }

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    return ret;
  }
  
  public static void addBulkLoadInProgressFlag(String path) {


    Mutation m = new Mutation(Constants.METADATA_BLIP_FLAG_PREFIX + path);
    m.put(EMPTY_TEXT, EMPTY_TEXT, new Value(new byte[] {}));


    update(SecurityConstants.getSystemCredentials(), m);
  }

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    update(SecurityConstants.getSystemCredentials(), m);
  }


  public static void removeBulkLoadInProgressFlag(String path) {


    Mutation m = new Mutation(Constants.METADATA_BLIP_FLAG_PREFIX + path);
    m.putDelete(EMPTY_TEXT, EMPTY_TEXT);


    update(SecurityConstants.getSystemCredentials(), m);
  }

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      String row = entry.getKey().getRow().toString();
      if (row.startsWith(Constants.METADATA_DELETE_FLAG_PREFIX + "/" + Constants.METADATA_TABLE_ID)) {
        String filename = row.substring(Constants.METADATA_DELETE_FLAG_PREFIX.length());
        // add the new entry first
        log.info("Moving " + filename + " marker to the root tablet");
        Mutation m = new Mutation(Constants.METADATA_DELETE_FLAG_FOR_METADATA_PREFIX + filename);
        m.put(new byte[]{}, new byte[]{}, new byte[]{});
        update(creds, m);
        // remove the old entry
        m = new Mutation(entry.getKey().getRow());
        m.putDelete(new byte[]{}, new byte[]{});
        update(creds, m);
      } else {
        break;
      }
    }

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  private void insertData(String table) throws Exception {
    
    BatchWriter bw = getConnector().createBatchWriter(table, new BatchWriterConfig());
    
    for (int i = 0; i < ROW_LIMIT; i++) {
      Mutation m = new Mutation(createRow(i));
      
      for (int j = 0; j < CF_LIMIT; j++) {
        for (int k = 0; k < CQ_LIMIT; k++) {
          for (int t = 0; t < TS_LIMIT; t++) {
            m.put(createCF(j), createCQ(k), t, new Value(String.format("%06d_%03d_%03d_%03d", i, j, k, t).getBytes(Constants.UTF8)));
          }
        }
      }
      
      bw.addMutation(m);

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  }
  
  private void insertData() throws Exception {
    
    BatchWriter bw = getConnector().createBatchWriter("vt", new BatchWriterConfig());
    Mutation m1 = new Mutation(new Text("row1"));
    
    mput(m1, "cf1", "cq1", "", "v1");
    mput(m1, "cf1", "cq1", "A", "v2");
    mput(m1, "cf1", "cq1", "B", "v3");
    mput(m1, "cf1", "cq1", "A&B", "v4");

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  }
  
  private void deleteData() throws Exception {
    
    BatchWriter bw = getConnector().createBatchWriter("vt", new BatchWriterConfig());
    Mutation m1 = new Mutation(new Text("row1"));
    
    mputDelete(m1, "cf1", "cq1", "");
    mputDelete(m1, "cf1", "cq1", "A");
    mputDelete(m1, "cf1", "cq1", "A&B");
    mputDelete(m1, "cf1", "cq1", "B&(L|M)");

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    queryData(nss("A", "B", "FOO", "L", "M", "Z"), nss("A", "B", "FOO", "L", "M", "Z"), expected);
  }
  
  private void insertDefaultData() throws Exception {
    BatchWriter bw = getConnector().createBatchWriter("vt2", new BatchWriterConfig());
    Mutation m1 = new Mutation(new Text("row1"));
    
    mput(m1, "cf1", "cq1", "BASE", "v1");
    mput(m1, "cf1", "cq2", "DEFLABEL", "v2");
    mput(m1, "cf1", "cq3", "", "v3");

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        byte[] val = data.get();
        
        int offset = ContinuousWalk.getPrevRowOffset(val);
        if (offset > 0) {
          long rowLong = Long.parseLong(new String(val, offset, 16, Constants.UTF8), 16);
          Mutation m = ContinuousIngest.genMutation(rowLong, random.nextInt(max_cf), random.nextInt(max_cq), EMPTY_VIS, iiId, count++, key.getRowData()
              .toArray(), random, true);
          context.write(null, m);
        }
        
      } else {

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    }
  }


  public List<Mutation> createMutations() {
    List<Mutation> mutations = new LinkedList<Mutation>();
    Mutation m = new Mutation("0");
    m.put("cf1", "cq1", "1");
    m.put("cf1", "cq2", "1");
    m.put("cf1", "cq3", "1");
    m.put("cf1", "cq4", "1");
    m.put("cf1", "cq5", "1");
    m.put("cf1", "cq6", "1");
    m.put("cf1", "cq7", "1");
    m.put("cf1", "cq8", "1");
    m.put("cf1", "cq9", "1");
    m.put("cf2", "cq1", "1");
    m.put("cf2", "cq2", "1");
    mutations.add(m);


    m = new Mutation("1");
    m.put("cf1", "cq1", "1");
    m.put("cf1", "cq2", "2");
    mutations.add(m);


    m = new Mutation("2");
    m.put("cf1", "cq1", "1");
    m.put("cf1", "cq2", "1");
    mutations.add(m);


    m = new Mutation("3");
    m.put("cf1", "cq1", "0");
    m.put("cf1", "cq2", "2");
    mutations.add(m);


    m = new Mutation("4");
    m.put("cf1", "cq1", "1");
    m.put("cf1", "cq2", "1");
    m.put("cf1", "cq3", "1");
    m.put("cf1", "cq4", "1");
    m.put("cf1", "cq5", "1");
    m.put("cf1", "cq6", "1");
    m.put("cf1", "cq7", "1");
    m.put("cf1", "cq8", "1");
    m.put("cf1", "cq9", "1");
    m.put("cf2", "cq1", "1");
    m.put("cf2", "cq2", "1");


    mutations.add(m);
    return mutations;
  }

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