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java.lang.Objectorg.apache.hadoop.hbase.regionserver.ScanWildcardColumnTracker
@InterfaceAudience.Private public class ScanWildcardColumnTracker
Keeps track of the columns for a scan if they are not explicitly specified
| Constructor Summary | |
|---|---|
ScanWildcardColumnTracker(int minVersion,
int maxVersion,
long oldestUnexpiredTS)
Return maxVersions of every row. |
|
| Method Summary | |
|---|---|
ScanQueryMatcher.MatchCode |
checkColumn(byte[] bytes,
int offset,
int length,
long timestamp,
byte type,
boolean ignoreCount)
Keeps track of the number of versions for the columns asked for |
boolean |
done()
We can never know a-priori if we are done, so always return false. |
ColumnCount |
getColumnHint()
Used by matcher and scan/get to get a hint of the next column to seek to after checkColumn() returns SKIP. |
ScanQueryMatcher.MatchCode |
getNextRowOrNextColumn(byte[] bytes,
int offset,
int qualLength)
Retrieve the MatchCode for the next row or column |
boolean |
isDone(long timestamp)
Give the tracker a chance to declare it's done based on only the timestamp to allow an early out. |
void |
reset()
Resets the Matcher |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public ScanWildcardColumnTracker(int minVersion,
int maxVersion,
long oldestUnexpiredTS)
minVersion - Minimum number of versions to keepmaxVersion - Maximum number of versions to returnoldestUnexpiredTS - oldest timestamp that has not expired according
to the TTL.| Method Detail |
|---|
public ScanQueryMatcher.MatchCode checkColumn(byte[] bytes,
int offset,
int length,
long timestamp,
byte type,
boolean ignoreCount)
throws IOException
checkColumn in interface ColumnTrackertimestamp - The timeToLive to enforce.type - The type of the KeyValueignoreCount - indicates if the KV needs to be excluded while counting
(used during compactions. We only count KV's that are older than all the
scanners' read points.)
IOException - in case there is an internal consistency problem
caused by a data corruption.public void reset()
ColumnTracker
reset in interface ColumnTrackerpublic ColumnCount getColumnHint()
getColumnHint in interface ColumnTrackerpublic boolean done()
done in interface ColumnTracker
public ScanQueryMatcher.MatchCode getNextRowOrNextColumn(byte[] bytes,
int offset,
int qualLength)
ColumnTracker
getNextRowOrNextColumn in interface ColumnTrackerpublic boolean isDone(long timestamp)
ColumnTracker
isDone in interface ColumnTrackertrue to early out based on timestamp.
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