org.apache.cassandra.db.compaction
Class SizeTieredCompactionStrategy
java.lang.Object
org.apache.cassandra.db.compaction.AbstractCompactionStrategy
org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy
public class SizeTieredCompactionStrategy
- extends AbstractCompactionStrategy
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
DEFAULT_MIN_SSTABLE_SIZE
protected static final long DEFAULT_MIN_SSTABLE_SIZE
- See Also:
- Constant Field Values
DEFAULT_BUCKET_LOW
protected static final double DEFAULT_BUCKET_LOW
- See Also:
- Constant Field Values
DEFAULT_BUCKET_HIGH
protected static final double DEFAULT_BUCKET_HIGH
- See Also:
- Constant Field Values
MIN_SSTABLE_SIZE_KEY
protected static final java.lang.String MIN_SSTABLE_SIZE_KEY
- See Also:
- Constant Field Values
BUCKET_LOW_KEY
protected static final java.lang.String BUCKET_LOW_KEY
- See Also:
- Constant Field Values
BUCKET_HIGH_KEY
protected static final java.lang.String BUCKET_HIGH_KEY
- See Also:
- Constant Field Values
minSSTableSize
protected long minSSTableSize
bucketLow
protected double bucketLow
bucketHigh
protected double bucketHigh
estimatedRemainingTasks
protected volatile int estimatedRemainingTasks
SizeTieredCompactionStrategy
public SizeTieredCompactionStrategy(ColumnFamilyStore cfs,
java.util.Map<java.lang.String,java.lang.String> options)
getNextBackgroundTask
public AbstractCompactionTask getNextBackgroundTask(int gcBefore)
- Specified by:
getNextBackgroundTask in class AbstractCompactionStrategy
- Parameters:
gcBefore - throw away tombstones older than this
- Returns:
- the next background/minor compaction task to run; null if nothing to do.
Is responsible for marking its sstables as compaction-pending.
getMaximalTask
public AbstractCompactionTask getMaximalTask(int gcBefore)
- Specified by:
getMaximalTask in class AbstractCompactionStrategy
- Parameters:
gcBefore - throw away tombstones older than this
- Returns:
- a compaction task that should be run to compact this columnfamilystore
as much as possible. Null if nothing to do.
getUserDefinedTask
public AbstractCompactionTask getUserDefinedTask(java.util.Collection<SSTableReader> sstables,
int gcBefore)
- Specified by:
getUserDefinedTask in class AbstractCompactionStrategy
- Parameters:
sstables - SSTables to compact. Must be marked as compacting.gcBefore - throw away tombstones older than this
- Returns:
- a compaction task corresponding to the requested sstables.
Will not be null. (Will throw if user requests an invalid compaction.)
getEstimatedRemainingTasks
public int getEstimatedRemainingTasks()
- Specified by:
getEstimatedRemainingTasks in class AbstractCompactionStrategy
- Returns:
- the number of background tasks estimated to still be needed for this columnfamilystore
getMaxSSTableSize
public long getMaxSSTableSize()
- Specified by:
getMaxSSTableSize in class AbstractCompactionStrategy
- Returns:
- size in bytes of the largest sstables for this strategy
toString
public java.lang.String toString()
- Overrides:
toString in class java.lang.Object
Copyright © 2012 The Apache Software Foundation