co.cask.cdap.logging.write

Class FileMetaDataManager

java.lang.Object

co.cask.cdap.logging.write.FileMetaDataManager

public final class FileMetaDataManager
extends Object

Handles reading/writing of file metadata.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	FileMetaDataManager.DeleteCallback Implement to receive a location before its meta data is removed.

Constructor Summary

Constructors

Constructor and Description
FileMetaDataManager(LogSaverTableUtil tableUtil, co.cask.tephra.TransactionExecutorFactory txExecutorFactory, LocationFactory locationFactory, CConfiguration cConf)

Method Summary

Methods

Modifier and Type	Method and Description
int	cleanMetaData(long tillTime, FileMetaDataManager.DeleteCallback callback) Deletes meta data until a given time, while keeping the latest meta data even if less than tillTime.
NavigableMap<Long,Location>	listFiles(LoggingContext loggingContext) Returns a list of log files for a logging context.
void	writeMetaData(LoggingContext loggingContext, long startTimeMs, Location location) Persists meta data associated with a log file.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileMetaDataManager

@Inject
public FileMetaDataManager(LogSaverTableUtil tableUtil,
                          co.cask.tephra.TransactionExecutorFactory txExecutorFactory,
                          LocationFactory locationFactory,
                          CConfiguration cConf)

Method Detail

writeMetaData

public void writeMetaData(LoggingContext loggingContext,
                 long startTimeMs,
                 Location location)
                   throws Exception

Persists meta data associated with a log file.

Parameters:

loggingContext - logging context containing the meta data.

startTimeMs - start log time associated with the file.

location - log file.

Throws:

Exception

listFiles

public NavigableMap<Long,Location> listFiles(LoggingContext loggingContext)
                                      throws Exception

Returns a list of log files for a logging context.

Parameters:

loggingContext - logging context.

Returns:

Sorted map containing key as start time, and value as log file.

Throws:

Exception

cleanMetaData

public int cleanMetaData(long tillTime,
                FileMetaDataManager.DeleteCallback callback)
                  throws Exception

Deletes meta data until a given time, while keeping the latest meta data even if less than tillTime.

Parameters:

tillTime - time till the meta data will be deleted.

callback - callback called before deleting a meta data column.

Returns:

total number of columns deleted.

Throws:

Exception