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Revert "HBASE-15392 Single Cell Get reads two HFileBlocks M hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java moreRowsMayExistAfterCell Exploit the fact a Scan is a Get Scan. Also save compares if no non-default stopRow." 

Revert mistaken commit

This reverts commit 7073f69993.
This commit is contained in:
stack 2016-03-22 18:39:22 -07:00
parent c49d0caf53
commit a13d6e000d
10 changed files with 62 additions and 370 deletions
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2
hbase-common/src/main/java/org/apache/hadoop/hbase/CellComparator.java
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@ -433,7 +433,7 @@ public class CellComparator implements Comparator<Cell>, Serializable {
/**
* Used to compare two cells based on the column hint provided. This is specifically
* used when we need to optimize the seeks based on the next indexed key. This is an
* advanced usage API specifically needed for some optimizations.
* advance usage API specifically needed for some optimizations.
* @param nextIndexedCell the next indexed cell
* @param currentCell the cell to be compared
* @param foff the family offset of the currentCell

13
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/CombinedBlockCache.java
View File

@ -63,8 +63,8 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
@Override
public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory,
final boolean cacheDataInL1) {
boolean metaBlock = buf.getBlockType().getCategory() != BlockCategory.DATA;
if (metaBlock || cacheDataInL1) {
boolean isMetaBlock = buf.getBlockType().getCategory() != BlockCategory.DATA;
if (isMetaBlock || cacheDataInL1) {
lruCache.cacheBlock(cacheKey, buf, inMemory, cacheDataInL1);
} else {
l2Cache.cacheBlock(cacheKey, buf, inMemory, false);
@ -81,9 +81,12 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
boolean repeat, boolean updateCacheMetrics) {
// TODO: is there a hole here, or just awkwardness since in the lruCache getBlock
// we end up calling l2Cache.getBlock.
return lruCache.containsBlock(cacheKey)?
lruCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics):
l2Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
if (lruCache.containsBlock(cacheKey)) {
return lruCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
}
Cacheable result = l2Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
return result;
}
@Override

8
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/KeyValueScanner.java
View File

@ -29,9 +29,6 @@ import org.apache.hadoop.hbase.client.Scan;
* Scanner that returns the next KeyValue.
*/
@InterfaceAudience.Private
// TODO: Change name from KeyValueScanner to CellScanner only we already have a simple CellScanner
// so this should be something else altogether, a decoration on our base CellScanner. TODO.
// This class shows in CPs so do it all in one swell swoop. HBase-2.0.0.
public interface KeyValueScanner extends Shipper {
/**
* The byte array represents for NO_NEXT_INDEXED_KEY;
@ -164,9 +161,8 @@ public interface KeyValueScanner extends Shipper {
public boolean seekToLastRow() throws IOException;
/**
* @return the next key in the index, usually the first key of next block OR a key that falls
* between last key of current block and first key of next block..
* see HFileWriterImpl#getMidpoint, or null if not known.
* @return the next key in the index (the key to seek to the next block)
* if known, or null otherwise
*/
public Cell getNextIndexedKey();
}

44
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java
View File

@ -145,17 +145,17 @@ public class ScanQueryMatcher {
private final boolean isReversed;
/**
* True if we are doing a 'Get' Scan. Every Get is actually a one-row Scan.
*/
private final boolean get;
/**
* Construct a QueryMatcher for a scan
* @param scan
* @param scanInfo The store's immutable scan info
* @param columns
* @param scanType Type of the scan
* @param earliestPutTs Earliest put seen in any of the store files.
* @param oldestUnexpiredTS the oldest timestamp we are interested in, based on TTL
* @param oldestUnexpiredTS the oldest timestamp we are interested in,
* based on TTL
* @param regionCoprocessorHost
* @throws IOException
*/
public ScanQueryMatcher(Scan scan, ScanInfo scanInfo, NavigableSet<byte[]> columns,
ScanType scanType, long readPointToUse, long earliestPutTs, long oldestUnexpiredTS,
@ -166,7 +166,6 @@ public class ScanQueryMatcher {
} else {
this.tr = timeRange;
}
this.get = scan.isGetScan();
this.rowComparator = scanInfo.getComparator();
this.regionCoprocessorHost = regionCoprocessorHost;
this.deletes = instantiateDeleteTracker();
@ -281,7 +280,7 @@ public class ScanQueryMatcher {
* caused by a data corruption.
*/
public MatchCode match(Cell cell) throws IOException {
if (filter != null && filter.filterAllRemaining()) {
if (filter != null && filter.filterAllRemaining()) {
return MatchCode.DONE_SCAN;
}
if (curCell != null) {
@ -504,27 +503,22 @@ public class ScanQueryMatcher {
}
}
/**
* @return Returns false if we know there are no more rows to be scanned (We've reached the
* <code>stopRow</code> or we are scanning on row only because this Scan is for a Get, etc.
*/
public boolean moreRowsMayExistAfter(Cell kv) {
// If a 'get' Scan -- we are doing a Get (every Get is a single-row Scan in implementation) --
// then we are looking at one row only, the one specified in the Get coordinate..so we know
// for sure that there are no more rows on this Scan
if (this.get) {
return false;
if (this.isReversed) {
if (rowComparator.compareRows(kv, stopRow, 0, stopRow.length) <= 0) {
return false;
} else {
return true;
}
}
// If no stopRow, return that there may be more rows. The tests that follow depend on a
// non-empty, non-default stopRow so this little test below short-circuits out doing the
// following compares.
if (this.stopRow == null || this.stopRow == HConstants.EMPTY_BYTE_ARRAY) {
if (!Bytes.equals(stopRow , HConstants.EMPTY_END_ROW) &&
rowComparator.compareRows(kv, stopRow, 0, stopRow.length) >= 0) {
// KV >= STOPROW
// then NO there is nothing left.
return false;
} else {
return true;
}
return this.isReversed?
rowComparator.compareRows(kv, stopRow, 0, stopRow.length) > 0:
Bytes.equals(stopRow, HConstants.EMPTY_END_ROW) ||
rowComparator.compareRows(kv, stopRow, 0, stopRow.length) < 0;
}
/**

79
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
View File

@ -600,12 +600,6 @@ public class StoreScanner extends NonReversedNonLazyKeyValueScanner
continue;
case DONE:
// Optimization for Gets! If DONE, no more to get on this row, early exit!
if (this.scan.isGetScan()) {
// Then no more to this row... exit.
close(false);// Do all cleanup except heap.close()
return scannerContext.setScannerState(NextState.NO_MORE_VALUES).hasMoreValues();
}
matcher.curCell = null;
return scannerContext.setScannerState(NextState.MORE_VALUES).hasMoreValues();
@ -655,67 +649,18 @@ public class StoreScanner extends NonReversedNonLazyKeyValueScanner
return scannerContext.setScannerState(NextState.NO_MORE_VALUES).hasMoreValues();
}
/**
* See if we should actually SEEK or rather just SKIP to the next Cell (see HBASE-13109).
* This method works together with ColumnTrackers and Filters. ColumnTrackers may issue SEEK
* hints, such as seek to next column, next row, or seek to an arbitrary seek key.
* This method intercepts these qcodes and decides whether a seek is the most efficient _actual_
* way to get us to the requested cell (SEEKs are more expensive than SKIP, SKIP, SKIP inside the
* current, loaded block).
* It does this by looking at the next indexed key of the current HFile. This key
* is then compared with the _SEEK_ key, where a SEEK key is an artificial 'last possible key
* on the row' (only in here, we avoid actually creating a SEEK key; in the compare we work with
* the current Cell but compare as though it were a seek key; see down in
* matcher.compareKeyForNextRow, etc). If the compare gets us onto the
* next block we *_SEEK, otherwise we just INCLUDE or SKIP, and let the ColumnTrackers or Filters
* go through the next Cell, and so on)
*
* <p>The ColumnTrackers and Filters must behave correctly in all cases, i.e. if they are past the
* Cells they care about they must issues a SKIP or SEEK.
*
* <p>Other notes:
* <ul>
* <li>Rows can straddle block boundaries</li>
* <li>Versions of columns can straddle block boundaries (i.e. column C1 at T1 might be in a
* different block than column C1 at T2)</li>
* <li>We want to SKIP and INCLUDE if the chance is high that we'll find the desired Cell after a
* few SKIPs...</li>
* <li>We want to INCLUDE_AND_SEEK and SEEK when the chance is high that we'll be able to seek
* past many Cells, especially if we know we need to go to the next block.</li>
* </ul>
* <p>A good proxy (best effort) to determine whether INCLUDE/SKIP is better than SEEK is whether
* we'll likely end up seeking to the next block (or past the next block) to get our next column.
* Example:
* <pre>
* | BLOCK 1 | BLOCK 2 |
* | r1/c1, r1/c2, r1/c3 | r1/c4, r1/c5, r2/c1 |
* ^ ^
* | |
* Next Index Key SEEK_NEXT_ROW (before r2/c1)
*
*
* | BLOCK 1 | BLOCK 2 |
* | r1/c1/t5, r1/c1/t4, r1/c1/t3 | r1/c1/t2, r1/c1/T1, r1/c2/T3 |
* ^ ^
* | |
* Next Index Key SEEK_NEXT_COL
* </pre>
* Now imagine we want columns c1 and c3 (see first diagram above), the 'Next Index Key' of r1/c4
* is > r1/c3 so we should seek to get to the c1 on the next row, r2. In second case, say we only
* want one version of c1, after we have it, a SEEK_COL will be issued to get to c2. Looking at
* the 'Next Index Key', it would land us in the next block, so we should SEEK. In other scenarios
* where the SEEK will not land us in the next block, it is very likely better to issues a series
* of SKIPs.
/*
* See if we should actually SEEK or rather just SKIP to the next Cell.
* (see HBASE-13109)
*/
@VisibleForTesting
protected ScanQueryMatcher.MatchCode optimize(ScanQueryMatcher.MatchCode qcode, Cell cell) {
private ScanQueryMatcher.MatchCode optimize(ScanQueryMatcher.MatchCode qcode, Cell cell) {
switch(qcode) {
case INCLUDE_AND_SEEK_NEXT_COL:
case SEEK_NEXT_COL:
{
Cell nextIndexedKey = getNextIndexedKey();
if (nextIndexedKey != null && nextIndexedKey != KeyValueScanner.NO_NEXT_INDEXED_KEY
&& matcher.compareKeyForNextColumn(nextIndexedKey, cell) > 0) {
&& matcher.compareKeyForNextColumn(nextIndexedKey, cell) >= 0) {
return qcode == MatchCode.SEEK_NEXT_COL ? MatchCode.SKIP : MatchCode.INCLUDE;
}
break;
@ -723,16 +668,10 @@ public class StoreScanner extends NonReversedNonLazyKeyValueScanner
case INCLUDE_AND_SEEK_NEXT_ROW:
case SEEK_NEXT_ROW:
{
// If it is a Get Scan, then we know that we are done with this row; there are no more
// rows beyond the current one: don't try to optimize. We are DONE. Return the *_NEXT_ROW
// qcode as is. When the caller gets these flags on a Get Scan, it knows it can shut down the
// Scan.
if (!this.scan.isGetScan()) {
Cell nextIndexedKey = getNextIndexedKey();
if (nextIndexedKey != null && nextIndexedKey != KeyValueScanner.NO_NEXT_INDEXED_KEY
&& matcher.compareKeyForNextRow(nextIndexedKey, cell) > 0) {
return qcode == MatchCode.SEEK_NEXT_ROW ? MatchCode.SKIP : MatchCode.INCLUDE;
}
Cell nextIndexedKey = getNextIndexedKey();
if (nextIndexedKey != null && nextIndexedKey != KeyValueScanner.NO_NEXT_INDEXED_KEY
&& matcher.compareKeyForNextRow(nextIndexedKey, cell) >= 0) {
return qcode == MatchCode.SEEK_NEXT_ROW ? MatchCode.SKIP : MatchCode.INCLUDE;
}
break;
}

3
hbase-server/src/main/java/org/apache/hadoop/hbase/util/CollectionBackedScanner.java
View File

@ -30,7 +30,8 @@ import org.apache.hadoop.hbase.CellComparator;
import org.apache.hadoop.hbase.regionserver.NonReversedNonLazyKeyValueScanner;
/**
* Utility scanner that wraps a sortable collection and serves as a KeyValueScanner.
* Utility scanner that wraps a sortable collection and serves
* as a KeyValueScanner.
*/
@InterfaceAudience.Private
public class CollectionBackedScanner extends NonReversedNonLazyKeyValueScanner {

6
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/KeyValueScanFixture.java
View File

@ -22,7 +22,6 @@ package org.apache.hadoop.hbase.regionserver;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellComparator;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.util.CollectionBackedScanner;
@ -34,8 +33,9 @@ import org.apache.hadoop.hbase.util.CollectionBackedScanner;
* to be a store file scanner.
*/
public class KeyValueScanFixture extends CollectionBackedScanner {
public KeyValueScanFixture(CellComparator comparator, Cell... cells) {
super(comparator, cells);
public KeyValueScanFixture(CellComparator comparator,
KeyValue... incData) {
super(comparator, incData);
}
public static List<KeyValueScanner> scanFixture(KeyValue[] ... kvArrays) {

3
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestKeyValueScanFixture.java
View File

@ -46,7 +46,8 @@ public class TestKeyValueScanFixture extends TestCase {
KeyValueTestUtil.create("RowB", "family", "qf1",
10, KeyValue.Type.Put, "value-10")
};
KeyValueScanner scan = new KeyValueScanFixture(CellComparator.COMPARATOR, kvs);
KeyValueScanner scan = new KeyValueScanFixture(
CellComparator.COMPARATOR, kvs);
KeyValue kv = KeyValueUtil.createFirstOnRow(Bytes.toBytes("RowA"));
// should seek to this:

244
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreScanner.java
View File

@ -20,7 +20,6 @@
package org.apache.hadoop.hbase.regionserver;
import static org.apache.hadoop.hbase.regionserver.KeyValueScanFixture.scanFixture;
import static org.junit.Assert.*;
import java.io.IOException;
import java.util.ArrayList;
@ -28,21 +27,16 @@ import java.util.Arrays;
import java.util.List;
import java.util.NavigableSet;
import java.util.TreeSet;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.CategoryBasedTimeout;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellComparator;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.KeepDeletedCells;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.KeyValueTestUtil;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.testclassification.RegionServerTests;
@ -59,113 +53,16 @@ import org.junit.rules.TestRule;
// Can't be small as it plays with EnvironmentEdgeManager
@Category({RegionServerTests.class, MediumTests.class})
public class TestStoreScanner {
private static final Log LOG = LogFactory.getLog(TestStoreScanner.class);
@Rule public TestName name = new TestName();
@Rule public final TestRule timeout = CategoryBasedTimeout.builder().withTimeout(this.getClass()).
withLookingForStuckThread(true).build();
private static final String CF_STR = "cf";
private static final byte [] CF = Bytes.toBytes(CF_STR);
final byte [] CF = Bytes.toBytes(CF_STR);
static Configuration CONF = HBaseConfiguration.create();
private ScanInfo scanInfo = new ScanInfo(CONF, CF, 0, Integer.MAX_VALUE,
Long.MAX_VALUE, KeepDeletedCells.FALSE, 0, CellComparator.COMPARATOR);
private ScanType scanType = ScanType.USER_SCAN;
/**
* From here on down, we have a bunch of defines and specific CELL_GRID of Cells. The
* CELL_GRID then has a Scanner that can fake out 'block' transitions. All this elaborate
* setup is for tests that ensure we don't overread, and that the
* {@link StoreScanner#optimize(org.apache.hadoop.hbase.regionserver.ScanQueryMatcher.MatchCode,
* Cell)} is not overly enthusiastic.
*/
private static final byte [] ZERO = new byte [] {'0'};
private static final byte [] ZERO_POINT_ZERO = new byte [] {'0', '.', '0'};
private static final byte [] ONE = new byte [] {'1'};
private static final byte [] TWO = new byte [] {'2'};
private static final byte [] TWO_POINT_TWO = new byte [] {'2', '.', '2'};
private static final byte [] THREE = new byte [] {'3'};
private static final byte [] FOUR = new byte [] {'4'};
private static final byte [] FIVE = new byte [] {'5'};
private static final byte [] VALUE = new byte [] {'v'};
private static final int CELL_GRID_BLOCK2_BOUNDARY = 4;
private static final int CELL_GRID_BLOCK3_BOUNDARY = 11;
private static final int CELL_GRID_BLOCK4_BOUNDARY = 15;
private static final int CELL_GRID_BLOCK5_BOUNDARY = 19;
/**
* Five rows by four columns distinguished by column qualifier (column qualifier is one of the
* four rows... ONE, TWO, etc.). Exceptions are a weird row after TWO; it is TWO_POINT_TWO.
* And then row FOUR has five columns finishing w/ row FIVE having a single column.
* We will use this to test scan does the right thing as it
* we do Gets, StoreScanner#optimize, and what we do on (faked) block boundaries.
*/
private static final Cell [] CELL_GRID = new Cell [] {
CellUtil.createCell(ONE, CF, ONE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(ONE, CF, TWO, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(ONE, CF, THREE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(ONE, CF, FOUR, 1L, KeyValue.Type.Put.getCode(), VALUE),
// Offset 4 CELL_GRID_BLOCK2_BOUNDARY
CellUtil.createCell(TWO, CF, ONE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(TWO, CF, TWO, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(TWO, CF, THREE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(TWO, CF, FOUR, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(TWO_POINT_TWO, CF, ZERO, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(TWO_POINT_TWO, CF, ZERO_POINT_ZERO, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(TWO_POINT_TWO, CF, FIVE, 1L, KeyValue.Type.Put.getCode(), VALUE),
// Offset 11! CELL_GRID_BLOCK3_BOUNDARY
CellUtil.createCell(THREE, CF, ONE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(THREE, CF, TWO, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(THREE, CF, THREE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(THREE, CF, FOUR, 1L, KeyValue.Type.Put.getCode(), VALUE),
// Offset 15 CELL_GRID_BLOCK4_BOUNDARY
CellUtil.createCell(FOUR, CF, ONE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(FOUR, CF, TWO, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(FOUR, CF, THREE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(FOUR, CF, FOUR, 1L, KeyValue.Type.Put.getCode(), VALUE),
// Offset 19 CELL_GRID_BLOCK5_BOUNDARY
CellUtil.createCell(FOUR, CF, FIVE, 1L, KeyValue.Type.Put.getCode(), VALUE),
CellUtil.createCell(FIVE, CF, ZERO, 1L, KeyValue.Type.Put.getCode(), VALUE),
};
/**
* A StoreScanner for our CELL_GRID above. Fakes the block transitions. Does counts of
* calls to optimize and counts of when optimize actually did an optimize.
*/
private static class CellGridStoreScanner extends StoreScanner {
// Count of how often optimize is called and of how often it does an optimize.
final AtomicInteger count = new AtomicInteger(0);
final AtomicInteger optimization = new AtomicInteger(0);
CellGridStoreScanner(final Scan scan, ScanInfo scanInfo, ScanType scanType)
throws IOException {
super(scan, scanInfo, scanType, scan.getFamilyMap().get(CF),
Arrays.<KeyValueScanner>asList(
new KeyValueScanner[] {new KeyValueScanFixture(CellComparator.COMPARATOR, CELL_GRID)}));
}
protected ScanQueryMatcher.MatchCode optimize(ScanQueryMatcher.MatchCode qcode, Cell cell) {
count.incrementAndGet();
ScanQueryMatcher.MatchCode after = super.optimize(qcode, cell);
LOG.info("Cell=" + cell + ", nextIndex=" + CellUtil.toString(getNextIndexedKey(), false) +
", before=" + qcode + ", after=" + after);
if (qcode != after) {
optimization.incrementAndGet();
}
return after;
};
@Override
public Cell getNextIndexedKey() {
// Fake block boundaries by having index of next block change as we go through scan.
return count.get() > CELL_GRID_BLOCK4_BOUNDARY?
CellUtil.createFirstOnRow(CELL_GRID[CELL_GRID_BLOCK5_BOUNDARY]):
count.get() > CELL_GRID_BLOCK3_BOUNDARY?
CellUtil.createFirstOnRow(CELL_GRID[CELL_GRID_BLOCK4_BOUNDARY]):
count.get() > CELL_GRID_BLOCK2_BOUNDARY?
CellUtil.createFirstOnRow(CELL_GRID[CELL_GRID_BLOCK3_BOUNDARY]):
CellUtil.createFirstOnRow(CELL_GRID[CELL_GRID_BLOCK2_BOUNDARY]);
}
};
/*
* Test utility for building a NavigableSet for scanners.
* @param strCols
@ -180,145 +77,6 @@ public class TestStoreScanner {
return cols;
}
@Test
public void testFullRowGetDoesNotOverreadWhenRowInsideOneBlock() throws IOException {
// Do a Get against row two. Row two is inside a block that starts with row TWO but ends with
// row TWO_POINT_TWO. We should read one block only.
Get get = new Get(TWO);
Scan scan = new Scan(get);
CellGridStoreScanner scanner = new CellGridStoreScanner(scan, this.scanInfo, this.scanType);
try {
List<Cell> results = new ArrayList<Cell>();
while (scanner.next(results)) {
continue;
}
// Should be four results of column 1 (though there are 5 rows in the CELL_GRID -- the
// TWO_POINT_TWO row does not have a a column ONE.
Assert.assertEquals(4, results.size());
// We should have gone the optimize route 5 times totally... an INCLUDE for the four cells
// in the row plus the DONE on the end.
Assert.assertEquals(5, scanner.count.get());
// For a full row Get, there should be no opportunity for scanner optimization.
Assert.assertEquals(0, scanner.optimization.get());
} finally {
scanner.close();
}
}
@Test
public void testFullRowSpansBlocks() throws IOException {
// Do a Get against row FOUR. It spans two blocks.
Get get = new Get(FOUR);
Scan scan = new Scan(get);
CellGridStoreScanner scanner = new CellGridStoreScanner(scan, this.scanInfo, this.scanType);
try {
List<Cell> results = new ArrayList<Cell>();
while (scanner.next(results)) {
continue;
}
// Should be four results of column 1 (though there are 5 rows in the CELL_GRID -- the
// TWO_POINT_TWO row does not have a a column ONE.
Assert.assertEquals(5, results.size());
// We should have gone the optimize route 6 times totally... an INCLUDE for the five cells
// in the row plus the DONE on the end.
Assert.assertEquals(6, scanner.count.get());
// For a full row Get, there should be no opportunity for scanner optimization.
Assert.assertEquals(0, scanner.optimization.get());
} finally {
scanner.close();
}
}
/**
* Test optimize in StoreScanner. Test that we skip to the next 'block' when we it makes sense
* reading the block 'index'.
* @throws IOException
*/
@Test
public void testOptimize() throws IOException {
Scan scan = new Scan();
// A scan that just gets the first qualifier on each row of the CELL_GRID
scan.addColumn(CF, ONE);
CellGridStoreScanner scanner = new CellGridStoreScanner(scan, this.scanInfo, this.scanType);
try {
List<Cell> results = new ArrayList<Cell>();
while (scanner.next(results)) {
continue;
}
// Should be four results of column 1 (though there are 5 rows in the CELL_GRID -- the
// TWO_POINT_TWO row does not have a a column ONE.
Assert.assertEquals(4, results.size());
for (Cell cell: results) {
assertTrue(Bytes.equals(ONE, 0, ONE.length,
cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength()));
}
Assert.assertTrue("Optimize should do some optimizations", scanner.optimization.get() > 0);
} finally {
scanner.close();
}
}
/**
* Ensure the optimize Scan method in StoreScanner does not get in the way of a Get doing minimum
* work... seeking to start of block and then SKIPPING until we find the wanted Cell.
* This 'simple' scenario mimics case of all Cells fitting inside a single HFileBlock.
* See HBASE-15392. This test is a little cryptic. Takes a bit of staring to figure what it up to.
* @throws IOException
*/
@Test
public void testOptimizeAndGet() throws IOException {
// First test a Get of two columns in the row R2. Every Get is a Scan. Get columns named
// R2 and R3.
Get get = new Get(TWO);
get.addColumn(CF, TWO);
get.addColumn(CF, THREE);
Scan scan = new Scan(get);
CellGridStoreScanner scanner = new CellGridStoreScanner(scan, this.scanInfo, this.scanType);
try {
List<Cell> results = new ArrayList<Cell>();
// For a Get there should be no more next's after the first call.
Assert.assertEquals(false, scanner.next(results));
// Should be one result only.
Assert.assertEquals(2, results.size());
// And we should have gone through optimize twice only.
Assert.assertEquals("First qcode is SEEK_NEXT_COL and second INCLUDE_AND_SEEK_NEXT_ROW",
3, scanner.count.get());
} finally {
scanner.close();
}
}
/**
* Ensure that optimize does not cause the Get to do more seeking than required. Optimize
* (see HBASE-15392) was causing us to seek all Cells in a block when a Get Scan if the next block
* index/start key was a different row to the current one. A bug. We'd call next too often
* because we had to exhaust all Cells in the current row making us load the next block just to
* discard what we read there. This test is a little cryptic. Takes a bit of staring to figure
* what it up to.
* @throws IOException
*/
@Test
public void testOptimizeAndGetWithFakedNextBlockIndexStart() throws IOException {
// First test a Get of second column in the row R2. Every Get is a Scan. Second column has a
// qualifier of R2.
Get get = new Get(THREE);
get.addColumn(CF, TWO);
Scan scan = new Scan(get);
CellGridStoreScanner scanner = new CellGridStoreScanner(scan, this.scanInfo, this.scanType);
try {
List<Cell> results = new ArrayList<Cell>();
// For a Get there should be no more next's after the first call.
Assert.assertEquals(false, scanner.next(results));
// Should be one result only.
Assert.assertEquals(1, results.size());
// And we should have gone through optimize twice only.
Assert.assertEquals("First qcode is SEEK_NEXT_COL and second INCLUDE_AND_SEEK_NEXT_ROW",
2, scanner.count.get());
} finally {
scanner.close();
}
}
@Test
public void testScanTimeRange() throws IOException {
String r1 = "R1";