org.apache.iotdb.tsfile.write.writer

Class RestorableTsFileIOWriter

java.lang.Object

org.apache.iotdb.tsfile.write.writer.TsFileIOWriter

org.apache.iotdb.tsfile.write.writer.RestorableTsFileIOWriter

All Implemented Interfaces:

AutoCloseable

public class RestorableTsFileIOWriter
extends TsFileIOWriter

This writer is for opening and recover a TsFile

(1) If the TsFile is closed normally, hasCrashed()=false and canWrite()=false

(2) Otherwise, the writer generates metadata for already flushed Chunks and truncate crashed data. The hasCrashed()=true and canWrite()=true

Notice!!! If you want to query this file through the generated metadata, remember to call the makeMetadataVisible()

Field Summary

Fields inherited from class org.apache.iotdb.tsfile.write.writer.TsFileIOWriter

canWrite, chunkGroupMetadataList, chunkMetadataList, config, file, MAGIC_STRING_BYTES, out, VERSION_NUMBER_BYTE

Constructor Summary

Constructors

Constructor and Description
RestorableTsFileIOWriter(File file)
RestorableTsFileIOWriter(File file, boolean truncate)

Method Summary

Modifier and Type	Method and Description
void	addSchema(Path path, IMeasurementSchema schema)
Map<Path,IMeasurementSchema>	getKnownSchema()
long	getMaxPlanIndex()
Map<String,Map<String,List<ChunkMetadata>>>	getMetadatasForQuery()
long	getMinPlanIndex()
List<ChunkMetadata>	getVisibleMetadataList(String deviceId, String measurementId, TSDataType dataType) For query.
static RestorableTsFileIOWriter	getWriterForAppendingDataOnCompletedTsFile(File file) Given a TsFile, generate a writable RestorableTsFileIOWriter.
boolean	hasCrashed() Whether this TsFile is crashed.
void	makeMetadataVisible() add all appendChunkMetadatas into memory.

Methods inherited from class org.apache.iotdb.tsfile.write.writer.TsFileIOWriter

canWrite, close, endChunkGroup, endCurrentChunk, endFile, filterChunks, getDeviceChunkMetadataMap, getDeviceTimeseriesMetadataMap, getFile, getIOWriterOut, getPos, isWritingChunkGroup, mark, reset, setFile, setMaxPlanIndex, setMinPlanIndex, startChunkGroup, startFile, startFlushChunk, truncate, writeBytesToStream, writeChunk, writePlanIndices

Methods inherited from class java.lang.Object

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

Constructor Detail

RestorableTsFileIOWriter

public RestorableTsFileIOWriter(File file)
                         throws IOException

Parameters:

file - a given tsfile path you want to (continue to) write

Throws:

IOException - if write failed, or the file is broken but autoRepair==false.

RestorableTsFileIOWriter

public RestorableTsFileIOWriter(File file,
                                boolean truncate)
                         throws IOException

Throws:

IOException

Method Detail

getWriterForAppendingDataOnCompletedTsFile

public static RestorableTsFileIOWriter getWriterForAppendingDataOnCompletedTsFile(File file)
                                                                           throws IOException

Given a TsFile, generate a writable RestorableTsFileIOWriter. That is, for a complete TsFile, the function erases all FileMetadata and supports writing new data; For a incomplete TsFile, the function supports writing new data directly. However, it is more efficient using the construction function of RestorableTsFileIOWriter, if the tsfile is incomplete.

Parameters:

file - a TsFile

Returns:

a writable RestorableTsFileIOWriter

Throws:

IOException

getKnownSchema

public Map<Path,IMeasurementSchema> getKnownSchema()

getVisibleMetadataList

public List<ChunkMetadata> getVisibleMetadataList(String deviceId,
                                                  String measurementId,
                                                  TSDataType dataType)

For query.

get chunks' metadata from memory.

Parameters:

deviceId - the device id

measurementId - the measurement id

dataType - the value type

Returns:

chunks' metadata

getMetadatasForQuery

public Map<String,Map<String,List<ChunkMetadata>>> getMetadatasForQuery()

makeMetadataVisible

public void makeMetadataVisible()

add all appendChunkMetadatas into memory. After calling this method, other classes can read these metadata.

hasCrashed

public boolean hasCrashed()

Whether this TsFile is crashed.

Returns:

false when this TsFile is complete

addSchema

public void addSchema(Path path,
                      IMeasurementSchema schema)

getMinPlanIndex

public long getMinPlanIndex()

Overrides:

getMinPlanIndex in class TsFileIOWriter

getMaxPlanIndex

public long getMaxPlanIndex()

Overrides:

getMaxPlanIndex in class TsFileIOWriter