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 updateTabletFlushID(KeyExtent extent, long flushID, TCredentials credentials, ZooLock zooLock) {
    if (!extent.isRootTablet()) {
      Mutation m = new Mutation(extent.getMetadataEntry());
      Constants.METADATA_FLUSH_COLUMN.put(m, new Value(Long.toString(flushID).getBytes(Constants.UTF8)));
      update(credentials, zooLock, m);
    }
  }

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    }
  }
  
  public static void updateTabletCompactID(KeyExtent extent, long compactID, TCredentials credentials, ZooLock zooLock) {
    if (!extent.isRootTablet()) {
      Mutation m = new Mutation(extent.getMetadataEntry());
      Constants.METADATA_COMPACT_COLUMN.put(m, new Value(Long.toString(compactID).getBytes(Constants.UTF8)));
      update(credentials, zooLock, m);
    }
  }

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      update(credentials, zooLock, m);
    }
  }
  
  public static void updateTabletDataFile(long tid, KeyExtent extent, Map<String,DataFileValue> estSizes, String time, TCredentials credentials, ZooLock zooLock) {
    Mutation m = new Mutation(extent.getMetadataEntry());
    byte[] tidBytes = Long.toString(tid).getBytes(Constants.UTF8);
    
    for (Entry<String,DataFileValue> entry : estSizes.entrySet()) {
      Text file = new Text(entry.getKey());
      m.put(Constants.METADATA_DATAFILE_COLUMN_FAMILY, file, new Value(entry.getValue().encode()));
      m.put(Constants.METADATA_BULKFILE_COLUMN_FAMILY, file, new Value(tidBytes));
    }
    Constants.METADATA_TIME_COLUMN.put(m, new Value(time.getBytes(Constants.UTF8)));
    update(credentials, zooLock, m);
  }

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    Constants.METADATA_TIME_COLUMN.put(m, new Value(time.getBytes(Constants.UTF8)));
    update(credentials, zooLock, m);
  }
  
  public static void addTablet(KeyExtent extent, String path, TCredentials credentials, char timeType, ZooLock lock) {
    Mutation m = extent.getPrevRowUpdateMutation();
    
    Constants.METADATA_DIRECTORY_COLUMN.put(m, new Value(path.getBytes(Constants.UTF8)));
    Constants.METADATA_TIME_COLUMN.put(m, new Value((timeType + "0").getBytes(Constants.UTF8)));
    
    update(credentials, lock, m);

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    update(credentials, lock, m);
  }
  
  public static void updateTabletPrevEndRow(KeyExtent extent, TCredentials credentials) {
    Mutation m = extent.getPrevRowUpdateMutation(); //
    update(credentials, m);
  }

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    return sizes;
  }


  public static void addNewTablet(KeyExtent extent, String path, TServerInstance location, Map<String,DataFileValue> datafileSizes,
      Map<String,Long> bulkLoadedFiles, TCredentials credentials, String time, long lastFlushID, long lastCompactID, ZooLock zooLock) {
    Mutation m = extent.getPrevRowUpdateMutation();
    
    Constants.METADATA_DIRECTORY_COLUMN.put(m, new Value(path.getBytes(Constants.UTF8)));
    Constants.METADATA_TIME_COLUMN.put(m, new Value(time.getBytes(Constants.UTF8)));
    if (lastFlushID > 0)
      Constants.METADATA_FLUSH_COLUMN.put(m, new Value(Long.toString(lastFlushID).getBytes(Constants.UTF8)));
    if (lastCompactID > 0)
      Constants.METADATA_COMPACT_COLUMN.put(m, new Value(Long.toString(lastCompactID).getBytes(Constants.UTF8)));
    
    if (location != null) {
      m.put(Constants.METADATA_CURRENT_LOCATION_COLUMN_FAMILY, location.asColumnQualifier(), location.asMutationValue());
      m.putDelete(Constants.METADATA_FUTURE_LOCATION_COLUMN_FAMILY, location.asColumnQualifier());
    }


    for (Entry<String,DataFileValue> entry : datafileSizes.entrySet()) {
      m.put(Constants.METADATA_DATAFILE_COLUMN_FAMILY, new Text(entry.getKey()), new Value(entry.getValue().encode()));
    }


    for (Entry<String,Long> entry : bulkLoadedFiles.entrySet()) {
      byte[] tidBytes = Long.toString(entry.getValue()).getBytes(Constants.UTF8);
      m.put(Constants.METADATA_BULKFILE_COLUMN_FAMILY, new Text(entry.getKey()), new Value(tidBytes));
    }
    
    update(credentials, zooLock, m);
  }

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    update(credentials, zooLock, m);
  }
  
  public static void rollBackSplit(Text metadataEntry, Text oldPrevEndRow, TCredentials credentials, ZooLock zooLock) {
    KeyExtent ke = new KeyExtent(metadataEntry, oldPrevEndRow);
    Mutation m = ke.getPrevRowUpdateMutation();
    Constants.METADATA_SPLIT_RATIO_COLUMN.putDelete(m);
    Constants.METADATA_OLD_PREV_ROW_COLUMN.putDelete(m);
    update(credentials, zooLock, m);
  }

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    Constants.METADATA_OLD_PREV_ROW_COLUMN.putDelete(m);
    update(credentials, zooLock, m);
  }


  public static void splitTablet(KeyExtent extent, Text oldPrevEndRow, double splitRatio, TCredentials credentials, ZooLock zooLock) {
    Mutation m = extent.getPrevRowUpdateMutation(); //
    
    Constants.METADATA_SPLIT_RATIO_COLUMN.put(m, new Value(Double.toString(splitRatio).getBytes(Constants.UTF8)));
    
    Constants.METADATA_OLD_PREV_ROW_COLUMN.put(m, KeyExtent.encodePrevEndRow(oldPrevEndRow));
    Constants.METADATA_CHOPPED_COLUMN.putDelete(m);

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    update(credentials, zooLock, m);
  }
  
  public static void finishSplit(Text metadataEntry, Map<String,DataFileValue> datafileSizes, List<String> highDatafilesToRemove, TCredentials credentials,
      ZooLock zooLock) {
    Mutation m = new Mutation(metadataEntry);
    Constants.METADATA_SPLIT_RATIO_COLUMN.putDelete(m);
    Constants.METADATA_OLD_PREV_ROW_COLUMN.putDelete(m);
    Constants.METADATA_CHOPPED_COLUMN.putDelete(m);
    
    for (Entry<String,DataFileValue> entry : datafileSizes.entrySet()) {
      m.put(Constants.METADATA_DATAFILE_COLUMN_FAMILY, new Text(entry.getKey()), new Value(entry.getValue().encode()));
    }


    for (String pathToRemove : highDatafilesToRemove) {
      m.putDelete(Constants.METADATA_DATAFILE_COLUMN_FAMILY, new Text(pathToRemove));
    }


    update(credentials, zooLock, m);
  }

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      // add delete flags for those paths before the data file reference is removed
      addDeleteEntries(extent, datafilesToDelete, credentials);
    }


    // replace data file references to old mapfiles with the new mapfiles
    Mutation m = new Mutation(extent.getMetadataEntry());


    for (String pathToRemove : datafilesToDelete)
      m.putDelete(Constants.METADATA_DATAFILE_COLUMN_FAMILY, new Text(pathToRemove));


    for (String scanFile : scanFiles)
      m.put(Constants.METADATA_SCANFILE_COLUMN_FAMILY, new Text(scanFile), new Value(new byte[0]));
    
    if (size.getNumEntries() > 0)
      m.put(Constants.METADATA_DATAFILE_COLUMN_FAMILY, new Text(path), new Value(size.encode()));


    if (compactionId != null)
      Constants.METADATA_COMPACT_COLUMN.put(m, new Value(Long.toString(compactionId).getBytes(Constants.UTF8)));
    
    TServerInstance self = getTServerInstance(address, zooLock);

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