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 static void addDeleteEntry(String tableId, String path) {
    update(SecurityConstants.getSystemCredentials(), createDeleteMutation(tableId, path));
  }


  public static Mutation createDeleteMutation(String tableId, String pathToRemove) {
    Mutation delFlag;
    String prefix = Constants.METADATA_DELETE_FLAG_PREFIX;
    if (tableId.equals(Constants.METADATA_TABLE_ID))
      prefix = Constants.METADATA_DELETE_FLAG_FOR_METADATA_PREFIX;


    if (pathToRemove.startsWith("../"))
      delFlag = new Mutation(new Text(prefix + pathToRemove.substring(2)));
    else
      delFlag = new Mutation(new Text(prefix + "/" + tableId + pathToRemove));


    delFlag.put(EMPTY_TEXT, EMPTY_TEXT, new Value(new byte[] {}));
    return delFlag;
  }

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      connector.tableOperations().addSplits(opts.getTableName(), keys);
      BatchWriter b = connector.createBatchWriter(opts.getTableName(), bwOpts.getBatchWriterConfig());
      
      // populate
      for (int i = 0; i < opts.count; i++) {
        Mutation m = new Mutation(new Text(String.format("%05d", i)));
        m.put(new Text("col" + Integer.toString((i % 3) + 1)), new Text("qual"), new Value("junk".getBytes(Constants.UTF8)));
        b.addMutation(m);
      }
      b.close();
    }

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    delFlag.put(EMPTY_TEXT, EMPTY_TEXT, new Value(new byte[] {}));
    return delFlag;
  }
  
  public static void removeScanFiles(KeyExtent extent, Set<String> scanFiles, TCredentials credentials, ZooLock zooLock) {
    Mutation m = new Mutation(extent.getMetadataEntry());


    for (String pathToRemove : scanFiles)
      m.putDelete(Constants.METADATA_SCANFILE_COLUMN_FAMILY, new Text(pathToRemove));


    update(credentials, zooLock, m);
  }

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    Text tableIdText = new Text(tableId);
    BatchWriter bw = new BatchWriterImpl(HdfsZooInstance.getInstance(), credentials, Constants.METADATA_TABLE_ID, new BatchWriterConfig().setMaxMemory(1000000)
        .setMaxLatency(120000l, TimeUnit.MILLISECONDS).setMaxWriteThreads(2));
    
    // scan metadata for our table and delete everything we find
    Mutation m = null;
    ms.setRange(new KeyExtent(tableIdText, null, null).toMetadataRange());


    // insert deletes before deleting data from !METADATA... this makes the code fault tolerant
    if (insertDeletes) {


      ms.fetchColumnFamily(Constants.METADATA_DATAFILE_COLUMN_FAMILY);
      Constants.METADATA_DIRECTORY_COLUMN.fetch(ms);
      
      for (Entry<Key,Value> cell : ms) {
        Key key = cell.getKey();


        if (key.getColumnFamily().equals(Constants.METADATA_DATAFILE_COLUMN_FAMILY)) {
          String relPath = key.getColumnQualifier().toString();
          // only insert deletes for files owned by this table
          if (!relPath.startsWith("../"))
            bw.addMutation(createDeleteMutation(tableId, relPath));
        }


        if (Constants.METADATA_DIRECTORY_COLUMN.hasColumns(key)) {
          bw.addMutation(createDeleteMutation(tableId, cell.getValue().toString()));
        }
      }


      bw.flush();


      ms.clearColumns();
    }


    for (Entry<Key,Value> cell : ms) {
      Key key = cell.getKey();


      if (m == null) {
        m = new Mutation(key.getRow());
        if (lock != null)
          putLockID(lock, m);
      }


      if (key.getRow().compareTo(m.getRow(), 0, m.getRow().length) != 0) {
        bw.addMutation(m);
        m = new Mutation(key.getRow());
        if (lock != null)
          putLockID(lock, m);
      }
      m.putDelete(key.getColumnFamily(), key.getColumnQualifier());
    }


    if (m != null)
      bw.addMutation(m);

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        }
        UtilWaitThread.sleep(1000);
      }
    } else {
      String value = StringUtil.join(entry.logSet, ";") + "|" + entry.tabletId;
      Mutation m = new Mutation(entry.extent.getMetadataEntry());
      m.put(Constants.METADATA_LOG_COLUMN_FAMILY, new Text(entry.server + "/" + entry.filename), new Value(value.getBytes(Constants.UTF8)));
      update(credentials, zooLock, m);
    }
  }

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          }
          UtilWaitThread.sleep(1000);
        }
      }
    } else {
      Mutation m = new Mutation(extent.getMetadataEntry());
      for (LogEntry entry : logEntries) {
        m.putDelete(Constants.METADATA_LOG_COLUMN_FAMILY, new Text(entry.server + "/" + entry.filename));
      }
      update(SecurityConstants.getSystemCredentials(), zooLock, m);
    }
  }

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  }


  private static Mutation createCloneMutation(String srcTableId, String tableId, Map<Key,Value> tablet) {


    KeyExtent ke = new KeyExtent(tablet.keySet().iterator().next().getRow(), (Text) null);
    Mutation m = new Mutation(KeyExtent.getMetadataEntry(new Text(tableId), ke.getEndRow()));


    for (Entry<Key,Value> entry : tablet.entrySet()) {
      if (entry.getKey().getColumnFamily().equals(Constants.METADATA_DATAFILE_COLUMN_FAMILY)) {
        String cf = entry.getKey().getColumnQualifier().toString();
        if (!cf.startsWith("../"))
          cf = "../" + srcTableId + entry.getKey().getColumnQualifier();
        m.put(entry.getKey().getColumnFamily(), new Text(cf), entry.getValue());
      } else if (entry.getKey().getColumnFamily().equals(Constants.METADATA_CURRENT_LOCATION_COLUMN_FAMILY)) {
        m.put(Constants.METADATA_LAST_LOCATION_COLUMN_FAMILY, entry.getKey().getColumnQualifier(), entry.getValue());
      } else if (entry.getKey().getColumnFamily().equals(Constants.METADATA_LAST_LOCATION_COLUMN_FAMILY)) {
        // skip
      } else {
        m.put(entry.getKey().getColumnFamily(), entry.getKey().getColumnQualifier(), entry.getValue());
      }
    }
    return m;
  }

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      if (cloneSuccessful)
        continue;


      if (!srcFiles.containsAll(cloneFiles)) {
        // delete existing cloned tablet entry
        Mutation m = new Mutation(cloneTablet.keySet().iterator().next().getRow());


        for (Entry<Key,Value> entry : cloneTablet.entrySet()) {
          Key k = entry.getKey();
          m.putDelete(k.getColumnFamily(), k.getColumnQualifier(), k.getTimestamp());
        }


        bw.addMutation(m);


        for (Map<Key,Value> st : srcTablets)
          bw.addMutation(createCloneMutation(srcTableId, tableId, st));


        rewrites++;
      } else {
        // write out marker that this tablet was successfully cloned
        Mutation m = new Mutation(cloneTablet.keySet().iterator().next().getRow());
        m.put(Constants.METADATA_CLONED_COLUMN_FAMILY, new Text(""), new Value("OK".getBytes(Constants.UTF8)));
        bw.addMutation(m);
      }
    }


    bw.flush();

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    int dirCount = 0;


    for (Entry<Key,Value> entry : mscanner) {
      Key k = entry.getKey();
      Mutation m = new Mutation(k.getRow());
      m.putDelete(k.getColumnFamily(), k.getColumnQualifier());
      Constants.METADATA_DIRECTORY_COLUMN.put(m, new Value(FastFormat.toZeroPaddedString(dirCount++, 8, 16, "/c-".getBytes(Constants.UTF8))));
      bw.addMutation(m);
    }


    bw.close();

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    bw.close();


  }


  public static void chopped(KeyExtent extent, ZooLock zooLock) {
    Mutation m = new Mutation(extent.getMetadataEntry());
    Constants.METADATA_CHOPPED_COLUMN.put(m, new Value("chopped".getBytes(Constants.UTF8)));
    update(SecurityConstants.getSystemCredentials(), zooLock, m);
  }

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