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java.lang.Objectorg.apache.hadoop.hbase.regionserver.MultiVersionConsistencyControl
public class MultiVersionConsistencyControl
Manages the read/write consistency within memstore. This provides an interface for readers to determine what entries to ignore, and a mechanism for writers to obtain new write numbers, then "commit" the new writes for readers to read (thus forming atomic transactions).
Nested Class Summary | |
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static class |
MultiVersionConsistencyControl.WriteEntry
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Field Summary | |
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static long |
FIXED_SIZE
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Constructor Summary | |
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MultiVersionConsistencyControl()
Default constructor. |
Method Summary | |
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MultiVersionConsistencyControl.WriteEntry |
beginMemstoreInsert()
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void |
completeMemstoreInsert(MultiVersionConsistencyControl.WriteEntry e)
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static long |
getThreadReadPoint()
Get this thread's read point. |
void |
initialize(long startPoint)
Initializes the memstoreRead/Write points appropriately. |
long |
memstoreReadPoint()
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static void |
resetThreadReadPoint()
Set the thread MVCC read point to 0 (include everything). |
static long |
resetThreadReadPoint(MultiVersionConsistencyControl mvcc)
Set the thread MVCC read point to whatever the current read point is in this particular instance of MVCC. |
static void |
setThreadReadPoint(long readPoint)
Set the thread read point to the given value. |
void |
waitForRead(MultiVersionConsistencyControl.WriteEntry e)
Wait for the global readPoint to advance upto the specified transaction number. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final long FIXED_SIZE
Constructor Detail |
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public MultiVersionConsistencyControl()
Method Detail |
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public void initialize(long startPoint)
startPoint
- public static long getThreadReadPoint()
public static void setThreadReadPoint(long readPoint)
public static long resetThreadReadPoint(MultiVersionConsistencyControl mvcc)
public static void resetThreadReadPoint()
public MultiVersionConsistencyControl.WriteEntry beginMemstoreInsert()
public void completeMemstoreInsert(MultiVersionConsistencyControl.WriteEntry e)
public void waitForRead(MultiVersionConsistencyControl.WriteEntry e)
public long memstoreReadPoint()
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