Class NonReversedNonLazyKeyValueScanner
java.lang.Object
org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner
org.apache.hadoop.hbase.regionserver.NonReversedNonLazyKeyValueScanner
- All Implemented Interfaces:
Closeable
,AutoCloseable
,KeyValueScanner
,Shipper
- Direct Known Subclasses:
CollectionBackedScanner
,KeyValueHeap
,SnapshotSegmentScanner
,StoreScanner
A "non-reversed & non-lazy" scanner which does not support backward scanning and always does
a real seek operation. Most scanners are inherited from this class.
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Field Summary
Fields inherited from interface org.apache.hadoop.hbase.regionserver.KeyValueScanner
NO_NEXT_INDEXED_KEY
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionboolean
backwardSeek
(ExtendedCell key) Seek the scanner at or before the row of specified Cell, it firstly tries to seek the scanner at or after the specified Cell, return if peek KeyValue of scanner has the same row with specified Cell, otherwise seek the scanner at the first Cell of the row which is the previous row of specified KeyValueboolean
Seek the scanner at the first KeyValue of last rowboolean
Seek the scanner at the first Cell of the row which is the previous row of specified keyMethods inherited from class org.apache.hadoop.hbase.regionserver.NonLazyKeyValueScanner
doRealSeek, enforceSeek, getFilePath, getNextIndexedKey, isFileScanner, realSeekDone, recordBlockSize, requestSeek, shipped, shouldUseScanner
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface org.apache.hadoop.hbase.regionserver.KeyValueScanner
close, getScannerOrder, next, peek, reseek, seek
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Constructor Details
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NonReversedNonLazyKeyValueScanner
public NonReversedNonLazyKeyValueScanner()
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Method Details
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backwardSeek
Description copied from interface:KeyValueScanner
Seek the scanner at or before the row of specified Cell, it firstly tries to seek the scanner at or after the specified Cell, return if peek KeyValue of scanner has the same row with specified Cell, otherwise seek the scanner at the first Cell of the row which is the previous row of specified KeyValue- Parameters:
key
- seek KeyValue- Returns:
- true if the scanner is at the valid KeyValue, false if such KeyValue does not exist
- Throws:
IOException
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seekToPreviousRow
Description copied from interface:KeyValueScanner
Seek the scanner at the first Cell of the row which is the previous row of specified key- Parameters:
key
- seek value- Returns:
- true if the scanner at the first valid Cell of previous row, false if not existing such Cell
- Throws:
IOException
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seekToLastRow
Description copied from interface:KeyValueScanner
Seek the scanner at the first KeyValue of last row- Returns:
- true if scanner has values left, false if the underlying data is empty
- Throws:
IOException
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