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java.lang.Objectorg.apache.hadoop.hbase.regionserver.MultiVersionConsistencyControl
@InterfaceAudience.Private 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
|
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()
Generate and return a MultiVersionConsistencyControl.WriteEntry with a new write number. |
void |
completeMemstoreInsert(MultiVersionConsistencyControl.WriteEntry e)
Complete a MultiVersionConsistencyControl.WriteEntry that was created by beginMemstoreInsert() . |
void |
initialize(long startPoint)
Initializes the memstoreRead/Write points appropriately. |
long |
memstoreReadPoint()
|
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 MultiVersionConsistencyControl.WriteEntry beginMemstoreInsert()
MultiVersionConsistencyControl.WriteEntry
with a new write number.
To complete the WriteEntry and wait for it to be visible,
call completeMemstoreInsert(WriteEntry)
.
public void completeMemstoreInsert(MultiVersionConsistencyControl.WriteEntry e)
MultiVersionConsistencyControl.WriteEntry
that was created by beginMemstoreInsert()
.
At the end of this call, the global read point is at least as large as the write point
of the passed in WriteEntry. Thus, the write is visible to MVCC readers.
public void waitForRead(MultiVersionConsistencyControl.WriteEntry e)
public long memstoreReadPoint()
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