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## org.apache.cassandra.db.index.keys
Class KeysIndex

    java.lang.Object
      org.apache.cassandra.db.index.SecondaryIndex
          org.apache.cassandra.db.index.PerColumnSecondaryIndex
              org.apache.cassandra.db.index.keys.KeysIndex

    public class KeysIndex

extends PerColumnSecondaryIndex

Implements a secondary index for a column family using a second column family in which the row keys are indexed values, and column names are base row keys.

Field Summary

Fields inherited from class org.apache.cassandra.db.index.SecondaryIndex
`baseCfs, columnDefs, CUSTOM_INDEX_OPTION_NAME`

Constructor Summary
`KeysIndex()`

Method Summary
`SecondaryIndexSearcher` | `createSecondaryIndexSearcher(java.util.Set<java.nio.ByteBuffer> columns)` Called at query time Creates a implementation specific searcher instance for this index type
`void` | `deleteColumn(DecoratedKey<?> valueKey, java.nio.ByteBuffer rowKey, IColumn column)` Delete a column from the index
`void` | `forceBlockingFlush()` Forces this indexes in memory data to disk
`ColumnFamilyStore` | `getIndexCfs()` Allow access to the underlying column family store if there is one
`java.lang.String` | `getIndexName()`
`long` | `getLiveSize()` Get current amount of memory this index is consuming (in bytes)
`static AbstractType<?>` | `indexComparator()`
`void` | `init()` Perform any initialization work
`void` | `insertColumn(DecoratedKey<?> valueKey, java.nio.ByteBuffer rowKey, IColumn column)` insert a column to the index
`void` | `invalidate()` Remove the index and unregisters this index's mbean if one exists
`void` | `reload()` Reload an existing index following a change to its configuration, or that of the indexed column(s).
`void` | `removeIndex(java.nio.ByteBuffer columnName)` Delete all files and references to this index
`void` | `truncate(long truncatedAt)` Truncate all the data from the current index
`void` | `updateColumn(DecoratedKey<?> valueKey, java.nio.ByteBuffer rowKey, IColumn col)` update a column from the index
`void` | `validateOptions()` Validates the index_options passed in the ColumnDef

Methods inherited from class org.apache.cassandra.db.index.PerColumnSecondaryIndex
`getNameForSystemTable, validate`

Methods inherited from class org.apache.cassandra.db.index.SecondaryIndex
`buildIndexAsync, buildIndexBlocking, createInstance, getBaseCfs, isIndexBuilt, setIndexBuilt, setIndexRemoved`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### KeysIndex

    public KeysIndex()

Method Detail

### init

    public void init()

  Description copied from class: `SecondaryIndex`
  Perform any initialization work

  Specified by:
    `init` in class `SecondaryIndex`

### indexComparator

    public static AbstractType<?> indexComparator()

### deleteColumn

    public void deleteColumn(DecoratedKey<?> valueKey,
                             java.nio.ByteBuffer rowKey,
                             IColumn column)

  Description copied from class: `PerColumnSecondaryIndex`
  Delete a column from the index

  Specified by:
    `deleteColumn` in class `PerColumnSecondaryIndex`
  Parameters:
    `valueKey` - the column value which is used as the index key
    `rowKey` - the underlying row key which is indexed
    `column` - all the column info

### insertColumn

    public void insertColumn(DecoratedKey<?> valueKey,
                             java.nio.ByteBuffer rowKey,
                             IColumn column)

  Description copied from class: `PerColumnSecondaryIndex`
  insert a column to the index

  Specified by:
    `insertColumn` in class `PerColumnSecondaryIndex`
  Parameters:
    `valueKey` - the column value which is used as the index key
    `rowKey` - the underlying row key which is indexed
    `column` - all the column info

### updateColumn

    public void updateColumn(DecoratedKey<?> valueKey,
                             java.nio.ByteBuffer rowKey,
                             IColumn col)

  Description copied from class: `PerColumnSecondaryIndex`
  update a column from the index

  Specified by:
    `updateColumn` in class `PerColumnSecondaryIndex`
  Parameters:
    `valueKey` - the column value which is used as the index key
    `rowKey` - the underlying row key which is indexed
    `col` - all the column info

### removeIndex

    public void removeIndex(java.nio.ByteBuffer columnName)
                     throws java.io.IOException

  Description copied from class: `SecondaryIndex`
  Delete all files and references to this index

  Specified by:
    `removeIndex` in class `SecondaryIndex`
  Parameters:
    `columnName` - the indexed column to remove
  Throws:
    `java.io.IOException`

### forceBlockingFlush

    public void forceBlockingFlush()
                            throws java.io.IOException

  Description copied from class: `SecondaryIndex`
  Forces this indexes in memory data to disk

  Specified by:
    `forceBlockingFlush` in class `SecondaryIndex`
  Throws:
    `java.io.IOException`

### invalidate

    public void invalidate()

  Description copied from class: `SecondaryIndex`
  Remove the index and unregisters this index's mbean if one exists

  Specified by:
    `invalidate` in class `SecondaryIndex`

### truncate

    public void truncate(long truncatedAt)

  Description copied from class: `SecondaryIndex`
  Truncate all the data from the current index

  Specified by:
    `truncate` in class `SecondaryIndex`
  Parameters:
    `truncatedAt` - The truncation timestamp, all data before that timestamp should be rejected.

### getIndexCfs

    public ColumnFamilyStore getIndexCfs()

  Description copied from class: `SecondaryIndex`
  Allow access to the underlying column family store if there is one

  Specified by:
    `getIndexCfs` in class `SecondaryIndex`
  Returns:
    the underlying column family store or null

### createSecondaryIndexSearcher

    public SecondaryIndexSearcher createSecondaryIndexSearcher(java.util.Set<java.nio.ByteBuffer> columns)

  Description copied from class: `SecondaryIndex`
  Called at query time Creates a implementation specific searcher instance for this index type

  Specified by:
    `createSecondaryIndexSearcher` in class `SecondaryIndex`
  Parameters:
    `columns` - the list of columns which belong to this index type
  Returns:
    the secondary index search impl

### getIndexName

    public java.lang.String getIndexName()

  Specified by:
    `getIndexName` in class `SecondaryIndex`
  Returns:
    The name of the index

### validateOptions

    public void validateOptions()
                         throws ConfigurationException

  Description copied from class: `SecondaryIndex`
  Validates the index_options passed in the ColumnDef

  Specified by:
    `validateOptions` in class `SecondaryIndex`
  Throws:
    `ConfigurationException`

### getLiveSize

    public long getLiveSize()

  Description copied from class: `SecondaryIndex`
  Get current amount of memory this index is consuming (in bytes)

  Specified by:
    `getLiveSize` in class `SecondaryIndex`

### reload

    public void reload()
                throws java.io.IOException

  Description copied from class: `SecondaryIndex`
  Reload an existing index following a change to its configuration, or that of the indexed column(s). Differs from init() in that we expect expect new resources (such as CFS for a KEYS index) to be created by init() but not here

  Specified by:
    `reload` in class `SecondaryIndex`
  Throws:
    `java.io.IOException`

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