org.apache.hadoop.hbase.regionserver

Interface MemStoreSizing

All Known Implementing Classes:

CellArrayImmutableSegment, CellChunkImmutableSegment, CompositeImmutableSegment, CSLMImmutableSegment, ImmutableSegment, MutableSegment, Segment

@InterfaceAudience.Private
public interface MemStoreSizing

Accounting of current heap and data sizes. Tracks 3 sizes:

data size: the aggregated size of all key-value not including meta data such as index, time range etc.
2. heap size: the aggregated size of all data that is allocated on-heap including all key-values that reside on-heap and the metadata that resides on-heap
off-heap size: the aggregated size of all data that is allocated off-heap including all key-values that reside off-heap and the metadata that resides off-heap

3 examples to illustrate their usage:

Consider a store with 100MB of key-values allocated on-heap and 20MB of metadata allocated on-heap. The counters are <100MB, 120MB, 0>, respectively.

Consider a store with 100MB of key-values allocated off-heap and 20MB of metadata allocated on-heap (e.g, CAM index). The counters are <100MB, 20MB, 100MB>, respectively.

Consider a store with 100MB of key-values from which 95MB are allocated off-heap and 5MB are allocated on-heap (e.g., due to upserts) and 20MB of metadata from which 15MB allocated off-heap (e.g, CCM index) and 5MB allocated on-heap (e.g, CSLM index in active). The counters are <100MB, 10MB, 110MB>, respectively.

Like TimeRangeTracker, it has thread-safe and non-thread-safe implementations.

Field Summary

Fields

Modifier and Type	Field and Description
static MemStoreSizing	DUD

Method Summary

Modifier and Type	Method and Description
default long	decMemStoreSize(long dataSizeDelta, long heapSizeDelta, long offHeapSizeDelta, int cellsCountDelta)
default long	decMemStoreSize(MemStoreSize delta)
int	getCellsCount()
long	getDataSize()
long	getHeapSize()
MemStoreSize	getMemStoreSize()
long	getOffHeapSize()
long	incMemStoreSize(long dataSizeDelta, long heapSizeDelta, long offHeapSizeDelta, int cellsCount)
default long	incMemStoreSize(MemStoreSize delta)

Field Detail

DUD

static final MemStoreSizing DUD

Method Detail

incMemStoreSize

long incMemStoreSize(long dataSizeDelta,
                     long heapSizeDelta,
                     long offHeapSizeDelta,
                     int cellsCount)

Returns:

The new dataSize ONLY as a convenience

incMemStoreSize

default long incMemStoreSize(MemStoreSize delta)

decMemStoreSize

default long decMemStoreSize(long dataSizeDelta,
                             long heapSizeDelta,
                             long offHeapSizeDelta,
                             int cellsCountDelta)

Returns:

The new dataSize ONLY as a convenience

decMemStoreSize

default long decMemStoreSize(MemStoreSize delta)

getDataSize

long getDataSize()

getHeapSize

long getHeapSize()

getOffHeapSize

long getOffHeapSize()

getCellsCount

int getCellsCount()

getMemStoreSize

MemStoreSize getMemStoreSize()

Returns:

Use this datastructure to return all three settings, getDataSize(), getHeapSize(), and getOffHeapSize(), in the one go.