org.apache.hadoop.hbase.regionserver

Class TimeRangeTracker

java.lang.Object

org.apache.hadoop.hbase.regionserver.TimeRangeTracker

Direct Known Subclasses:

TimeRangeTracker.NonSyncTimeRangeTracker, TimeRangeTracker.SyncTimeRangeTracker

@InterfaceAudience.Private
public abstract class TimeRangeTracker
extends Object

Stores minimum and maximum timestamp values, it is [minimumTimestamp, maximumTimestamp] in interval notation. Use this class at write-time ONLY. Too much synchronization to use at read time Use TimeRange at read time instead of this. See toTimeRange() to make TimeRange to use. MemStores use this class to track minimum and maximum timestamps. The TimeRangeTracker made by the MemStore is passed to the StoreFile for it to write out as part a flush in the the file metadata. If no memstore involved -- i.e. a compaction -- then the StoreFile will calculate its own TimeRangeTracker as it appends. The StoreFile serialized TimeRangeTracker is used at read time via an instance of TimeRange to test if Cells fit the StoreFile TimeRange.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TimeRangeTracker.NonSyncTimeRangeTracker
static class	TimeRangeTracker.SyncTimeRangeTracker
static class	TimeRangeTracker.Type

Constructor Summary

Constructors

Constructor and Description
TimeRangeTracker()

Method Summary

Modifier and Type	Method and Description
protected abstract boolean	compareAndSetMax(long expect, long update)
protected abstract boolean	compareAndSetMin(long expect, long update)
static TimeRangeTracker	create(TimeRangeTracker.Type type)
static TimeRangeTracker	create(TimeRangeTracker.Type type, long minimumTimestamp, long maximumTimestamp)
static TimeRangeTracker	create(TimeRangeTracker.Type type, TimeRangeTracker trt)
abstract long	getMax()
abstract long	getMin()
boolean	includesTimeRange(TimeRange tr) Check if the range has ANY overlap with TimeRange
void	includeTimestamp(Cell cell) Update the current TimestampRange to include the timestamp from cell.
static TimeRangeTracker	parseFrom(byte[] data)
static TimeRangeTracker	parseFrom(byte[] data, TimeRangeTracker.Type type)
protected abstract void	setMax(long ts)
protected abstract void	setMin(long ts)
static byte[]	toByteArray(TimeRangeTracker tracker) This method used to serialize TimeRangeTracker (TRT) by protobuf while this breaks the forward compatibility on HFile.(See HBASE-21008) In previous hbase version ( < 2.0.0 ) we use DataOutput to serialize TRT, these old versions don't have capability to deserialize TRT which is serialized by protobuf.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TimeRangeTracker

public TimeRangeTracker()

Method Detail

create

public static TimeRangeTracker create(TimeRangeTracker.Type type)

create

public static TimeRangeTracker create(TimeRangeTracker.Type type,
                                      TimeRangeTracker trt)

create

public static TimeRangeTracker create(TimeRangeTracker.Type type,
                                      long minimumTimestamp,
                                      long maximumTimestamp)

setMax

protected abstract void setMax(long ts)

setMin

protected abstract void setMin(long ts)

compareAndSetMin

protected abstract boolean compareAndSetMin(long expect,
                                            long update)

compareAndSetMax

protected abstract boolean compareAndSetMax(long expect,
                                            long update)

includeTimestamp

public void includeTimestamp(Cell cell)

Update the current TimestampRange to include the timestamp from cell. If the Key is of type DeleteColumn or DeleteFamily, it includes the entire time range from 0 to timestamp of the key.

Parameters:

cell - the Cell to include

includesTimeRange

public boolean includesTimeRange(TimeRange tr)

Check if the range has ANY overlap with TimeRange

Parameters:

tr - TimeRange, it expects [minStamp, maxStamp)

Returns:

True if there is overlap, false otherwise

getMin

public abstract long getMin()

Returns:

the minimumTimestamp

getMax

public abstract long getMax()

Returns:

the maximumTimestamp

toString

public String toString()

Overrides:

toString in class Object

parseFrom

public static TimeRangeTracker parseFrom(byte[] data)
                                  throws IOException

Parameters:

data - the serialization data. It can't be null!

Returns:

An instance of NonSyncTimeRangeTracker filled w/ the content of serialized NonSyncTimeRangeTracker in timeRangeTrackerBytes.

Throws:

IOException

parseFrom

public static TimeRangeTracker parseFrom(byte[] data,
                                         TimeRangeTracker.Type type)
                                  throws IOException

Throws:

IOException

toByteArray

public static byte[] toByteArray(TimeRangeTracker tracker)
                          throws IOException

This method used to serialize TimeRangeTracker (TRT) by protobuf while this breaks the forward compatibility on HFile.(See HBASE-21008) In previous hbase version ( < 2.0.0 ) we use DataOutput to serialize TRT, these old versions don't have capability to deserialize TRT which is serialized by protobuf. So we need to revert the change of serializing TimeRangeTracker back to DataOutput. For more information, please check HBASE-21012.

Parameters:

tracker - TimeRangeTracker needed to be serialized.

Returns:

byte array filled with serialized TimeRangeTracker.

Throws:

IOException - if something goes wrong in writeLong.