Package org.apache.iotdb.tsfile.write.chunk

Interface IChunkGroupWriter

All Known Implementing Classes:

AlignedChunkGroupWriterImpl, NonAlignedChunkGroupWriterImpl

public interface IChunkGroupWriter

A chunk group in TsFile contains several series. A ChunkGroupWriter should implement write method which takes a timestamp(in TimeValue class) and a list of data points as input. It should also provide flushing method for serializing to local file system or HDFS.

Method Summary

Modifier and Type	Method	Description
long	flushToFileWriter(TsFileIOWriter tsfileWriter)	flushing method for serializing to local file system or HDFS.
long	getCurrentChunkGroupSize()	get the serialized size of current chunkGroup header + all chunks.
void	tryToAddSeriesWriter(java.util.List<MeasurementSchema> measurementSchemas)	given a measurement descriptor list, create corresponding writers and put into this ChunkGroupWriter.
void	tryToAddSeriesWriter(MeasurementSchema measurementSchema)	given a measurement descriptor, create a corresponding writer and put into this ChunkGroupWriter.
long	updateMaxGroupMemSize()	get the max memory occupied at this time.
int	write(long time, java.util.List<DataPoint> data)	receive a timestamp and a list of data points, write them to their series writers.
int	write(Tablet tablet)	receive a tablet, write it to chunk writers

Method Detail

write

int write(long time,
          java.util.List<DataPoint> data)
   throws WriteProcessException,
          java.io.IOException

receive a timestamp and a list of data points, write them to their series writers.

Parameters:

time - - all data points have unify time stamp.

data - - data point list to input

Throws:

WriteProcessException - exception in write process

java.io.IOException - exception in IO

write

int write(Tablet tablet)
   throws WriteProcessException,
          java.io.IOException

receive a tablet, write it to chunk writers

Throws:

WriteProcessException - exception in write process

java.io.IOException - exception in IO

flushToFileWriter

long flushToFileWriter(TsFileIOWriter tsfileWriter)
                throws java.io.IOException

flushing method for serializing to local file system or HDFS. Implemented by ChunkWriterImpl.writeToFileWriter().

Parameters:

tsfileWriter - - TSFileIOWriter

Returns:

current ChunkGroupDataSize

Throws:

java.io.IOException - exception in IO

updateMaxGroupMemSize

long updateMaxGroupMemSize()

get the max memory occupied at this time. Note that, this method should be called after running long calcAllocatedSize()

Returns:

- allocated memory size.

tryToAddSeriesWriter

void tryToAddSeriesWriter(MeasurementSchema measurementSchema)
                   throws java.io.IOException

given a measurement descriptor, create a corresponding writer and put into this ChunkGroupWriter.

Parameters:

measurementSchema - a measurement descriptor containing the message of the series

Throws:

java.io.IOException

tryToAddSeriesWriter

void tryToAddSeriesWriter(java.util.List<MeasurementSchema> measurementSchemas)
                   throws java.io.IOException

given a measurement descriptor list, create corresponding writers and put into this ChunkGroupWriter.

Parameters:

measurementSchemas -

Throws:

java.io.IOException

getCurrentChunkGroupSize

long getCurrentChunkGroupSize()

get the serialized size of current chunkGroup header + all chunks. Notice, the value does not include any un-sealed page in the chunks.

Returns:

the serialized size of current chunkGroup header + all chunk