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## org.apache.cassandra.config
Class DatabaseDescriptor

    java.lang.Object
      org.apache.cassandra.config.DatabaseDescriptor

    public class DatabaseDescriptor

extends java.lang.Object

Nested Class Summary
`static class` | `DatabaseDescriptor.CommitLogSync`
`static class` | `DatabaseDescriptor.DiskAccessMode`

Field Summary
`static int` | `DEFAULT_KEY_CACHE_SAVE_PERIOD_IN_SECONDS`
`static int` | `DEFAULT_ROW_CACHE_SAVE_PERIOD_IN_SECONDS`
`static java.lang.String` | `ophf`
`static java.lang.String` | `random`
`static java.lang.String` | `STREAMING_SUBDIR`

Constructor Summary
`DatabaseDescriptor()`

Method Summary
`static void` | `createAllDirectories()` Creates all storage-related directories.
`static java.lang.String[]` | `getAllDataFileLocations()`
`static java.lang.String[]` | `getAllDataFileLocationsForTable(java.lang.String table)` Get a list of data directories for a given table
`static IAuthenticator` | `getAuthenticator()`
`static int` | `getBMTThreshold()`
`static CFMetaData` | `getCFMetaData(java.lang.String tableName, java.lang.String cfName)`
`static java.lang.String` | `getClusterName()`
`static java.lang.String` | `getColumnFamilyType(java.lang.String tableName, java.lang.String cfName)`
`static int` | `getColumnIndexSize()`
`static java.lang.String` | `getColumnType(java.lang.String tableName, java.lang.String cfName)`
`static DatabaseDescriptor.CommitLogSync` | `getCommitLogSync()`
`static double` | `getCommitLogSyncBatchWindow()`
`static int` | `getCommitLogSyncPeriod()`
`static int` | `getCompactionPriority()`
`static AbstractType` | `getComparator(java.lang.String tableName, java.lang.String cfName)`
`static int` | `getConcurrentReaders()`
`static int` | `getConcurrentWriters()`
`static java.lang.String` | `getConfigFileName()`
`static boolean` | `getConsistencyCheck()`
`static int` | `getConsistencyThreads()`
`static java.lang.String` | `getDataFileLocationForTable(java.lang.String table, long expectedCompactedFileSize)`
`static DatabaseDescriptor.DiskAccessMode` | `getDiskAccessMode()`
`static IEndPointSnitch` | `getEndPointSnitch(java.lang.String table)`
`static double` | `getFlushDataBufferSizeInMB()`
`static double` | `getFlushIndexBufferSizeInMB()`
`static int` | `getGcGraceInSeconds()`
`static DatabaseDescriptor.DiskAccessMode` | `getIndexAccessMode()`
`static int` | `getIndexedReadBufferSizeInKB()`
`static int` | `getIndexInterval()`
`static java.lang.String` | `getInitialToken()`
`static java.lang.String` | `getJobJarLocation()`
`static java.lang.String` | `getJobTrackerAddress()`
`static int` | `getKeysCachedFor(java.lang.String tableName, java.lang.String columnFamilyName, long expectedKeys)`
`static java.net.InetAddress` | `getListenAddress()`
`static java.lang.String` | `getLogFileLocation()`
`static int` | `getMemtableLifetimeMS()`
`static double` | `getMemtableOperations()`
`static int` | `getMemtableThroughput()`
`static java.lang.String` | `getNextAvailableDataLocation()`
`static java.util.List<java.lang.String>` | `getNonSystemTables()`
`static IPartitioner` | `getPartitioner()`
`static int` | `getPhiConvictThreshold()`
`static java.lang.Class<? extends AbstractReplicationStrategy>` | `getReplicaPlacementStrategyClass(java.lang.String table)`
`static int` | `getReplicationFactor(java.lang.String table)`
`static int` | `getRowsCachedFor(java.lang.String tableName, java.lang.String columnFamilyName, long expectedRows)`
`static long` | `getRowWarningThreshold()`
`static long` | `getRpcTimeout()`
`static java.util.Set<java.net.InetAddress>` | `getSeeds()`
`static java.io.File` | `getSerializedKeyCachePath(java.lang.String ksName, java.lang.String cfName)`
`static java.io.File` | `getSerializedRowCachePath(java.lang.String ksName, java.lang.String cfName)`
`static int` | `getSlicedReadBufferSizeInKB()`
`static int` | `getStoragePort()`
`static AbstractType` | `getSubComparator(java.lang.String tableName, java.lang.String cfName)`
`static java.util.Map<java.lang.String,CFMetaData>` | `getTableMetaData(java.lang.String tableName)`
`static java.util.Set<java.lang.String>` | `getTables()`
`static java.net.InetAddress` | `getThriftAddress()`
`static int` | `getThriftPort()`
`static boolean` | `hintedHandoffEnabled()`
`static boolean` | `isAutoBootstrap()`
`static boolean` | `isSnapshotBeforeCompaction()`
`static boolean` | `isThriftFramed()`
`static void` | `storeMetadata()` Create the metadata tables.

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

Field Detail

### STREAMING_SUBDIR

    public static final java.lang.String STREAMING_SUBDIR

See Also:
  Constant Field Values

### random

    public static final java.lang.String random

See Also:
  Constant Field Values

### ophf

    public static final java.lang.String ophf

See Also:
  Constant Field Values

### DEFAULT_ROW_CACHE_SAVE_PERIOD_IN_SECONDS

    public static final int DEFAULT_ROW_CACHE_SAVE_PERIOD_IN_SECONDS

See Also:
  Constant Field Values

### DEFAULT_KEY_CACHE_SAVE_PERIOD_IN_SECONDS

    public static final int DEFAULT_KEY_CACHE_SAVE_PERIOD_IN_SECONDS

See Also:
  Constant Field Values

Constructor Detail

### DatabaseDescriptor

    public DatabaseDescriptor()

Method Detail

### getSerializedRowCachePath

    public static java.io.File getSerializedRowCachePath(java.lang.String ksName,
                                                         java.lang.String cfName)

### getSerializedKeyCachePath

    public static java.io.File getSerializedKeyCachePath(java.lang.String ksName,
                                                         java.lang.String cfName)

### getCompactionPriority

    public static int getCompactionPriority()

### getAuthenticator

    public static IAuthenticator getAuthenticator()

### isThriftFramed

    public static boolean isThriftFramed()

### createAllDirectories

    public static void createAllDirectories()
                                     throws java.io.IOException

  Creates all storage-related directories.

  Throws:
    `java.io.IOException` - when a disk problem is encountered.

### storeMetadata

    public static void storeMetadata()
                              throws java.io.IOException

  Create the metadata tables. This table has information about the table name and the column families that make up the table. Each column family also has an associated ID which is an int.

  Throws:
    `java.io.IOException`

### getGcGraceInSeconds

    public static int getGcGraceInSeconds()

### getPartitioner

    public static IPartitioner getPartitioner()

### getEndPointSnitch

    public static IEndPointSnitch getEndPointSnitch(java.lang.String table)

### getReplicaPlacementStrategyClass

    public static java.lang.Class<? extends AbstractReplicationStrategy> getReplicaPlacementStrategyClass(java.lang.String table)

### getJobTrackerAddress

    public static java.lang.String getJobTrackerAddress()

### getColumnIndexSize

    public static int getColumnIndexSize()

### getMemtableLifetimeMS

    public static int getMemtableLifetimeMS()

### getInitialToken

    public static java.lang.String getInitialToken()

### getMemtableThroughput

    public static int getMemtableThroughput()

### getMemtableOperations

    public static double getMemtableOperations()

### getConsistencyCheck

    public static boolean getConsistencyCheck()

### getClusterName

    public static java.lang.String getClusterName()

### getConfigFileName

    public static java.lang.String getConfigFileName()

### getJobJarLocation

    public static java.lang.String getJobJarLocation()

### getTableMetaData

    public static java.util.Map<java.lang.String,CFMetaData> getTableMetaData(java.lang.String tableName)

### getCFMetaData

    public static CFMetaData getCFMetaData(java.lang.String tableName,
                                           java.lang.String cfName)

### getColumnType

    public static java.lang.String getColumnType(java.lang.String tableName,
                                                 java.lang.String cfName)

### getTables

    public static java.util.Set<java.lang.String> getTables()

### getNonSystemTables

    public static java.util.List<java.lang.String> getNonSystemTables()

### getStoragePort

    public static int getStoragePort()

### getThriftPort

    public static int getThriftPort()

### getReplicationFactor

    public static int getReplicationFactor(java.lang.String table)

### getRpcTimeout

    public static long getRpcTimeout()

### getPhiConvictThreshold

    public static int getPhiConvictThreshold()

### getConsistencyThreads

    public static int getConsistencyThreads()

### getConcurrentReaders

    public static int getConcurrentReaders()

### getConcurrentWriters

    public static int getConcurrentWriters()

### getRowWarningThreshold

    public static long getRowWarningThreshold()

### getAllDataFileLocations

    public static java.lang.String[] getAllDataFileLocations()

### getAllDataFileLocationsForTable

    public static java.lang.String[] getAllDataFileLocationsForTable(java.lang.String table)

  Get a list of data directories for a given table

  Parameters:
    `table` - name of the table.
  Returns:
    an array of path to the data directories.

### getNextAvailableDataLocation

    public static java.lang.String getNextAvailableDataLocation()

### getLogFileLocation

    public static java.lang.String getLogFileLocation()

### getSeeds

    public static java.util.Set<java.net.InetAddress> getSeeds()

### getColumnFamilyType

    public static java.lang.String getColumnFamilyType(java.lang.String tableName,
                                                       java.lang.String cfName)

### getDataFileLocationForTable

    public static java.lang.String getDataFileLocationForTable(java.lang.String table,
                                                               long expectedCompactedFileSize)

### getComparator

    public static AbstractType getComparator(java.lang.String tableName,
                                             java.lang.String cfName)

### getSubComparator

    public static AbstractType getSubComparator(java.lang.String tableName,
                                                java.lang.String cfName)

### getKeysCachedFor

    public static int getKeysCachedFor(java.lang.String tableName,
                                       java.lang.String columnFamilyName,
                                       long expectedKeys)

  Returns:
    The absolute number of keys that should be cached per table.

### getRowsCachedFor

    public static int getRowsCachedFor(java.lang.String tableName,
                                       java.lang.String columnFamilyName,
                                       long expectedRows)

  Returns:
    The absolute number of rows that should be cached for the columnfamily.

### getListenAddress

    public static java.net.InetAddress getListenAddress()

### getThriftAddress

    public static java.net.InetAddress getThriftAddress()

### getCommitLogSyncBatchWindow

    public static double getCommitLogSyncBatchWindow()

### getCommitLogSyncPeriod

    public static int getCommitLogSyncPeriod()

### getCommitLogSync

    public static DatabaseDescriptor.CommitLogSync getCommitLogSync()

### getDiskAccessMode

    public static DatabaseDescriptor.DiskAccessMode getDiskAccessMode()

### getIndexAccessMode

    public static DatabaseDescriptor.DiskAccessMode getIndexAccessMode()

### getFlushDataBufferSizeInMB

    public static double getFlushDataBufferSizeInMB()

### getFlushIndexBufferSizeInMB

    public static double getFlushIndexBufferSizeInMB()

### getIndexedReadBufferSizeInKB

    public static int getIndexedReadBufferSizeInKB()

### getSlicedReadBufferSizeInKB

    public static int getSlicedReadBufferSizeInKB()

### getBMTThreshold

    public static int getBMTThreshold()

### isSnapshotBeforeCompaction

    public static boolean isSnapshotBeforeCompaction()

### isAutoBootstrap

    public static boolean isAutoBootstrap()

### hintedHandoffEnabled

    public static boolean hintedHandoffEnabled()

### getIndexInterval

    public static int getIndexInterval()

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