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HBASE-21640 Remove the TODO when increment zero

This commit is contained in:
Guanghao Zhang 2018-12-25 17:42:38 +08:00
parent 44dec60054
commit 4281cb3b95
2 changed files with 8 additions and 22 deletions
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21
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
View File

@ -7963,8 +7963,7 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
/**
* Reckon the Cells to apply to WAL, memstore, and to return to the Client; these Sets are not
* always the same dependent on whether to write WAL or if the amount to increment is zero (in
* this case we write back nothing, just return latest Cell value to the client).
* always the same dependent on whether to write WAL.
*
* @param results Fill in here what goes back to the Client if it is non-null (if null, client
* doesn't want results).
@ -8006,9 +8005,8 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
* @param op Whether Increment or Append
* @param mutation The encompassing Mutation object
* @param deltas Changes to apply to this Store; either increment amount or data to append
* @param results In here we accumulate all the Cells we are to return to the client; this List
* can be larger than what we return in case where delta is zero; i.e. don't write
* out new values, just return current value. If null, client doesn't want results returned.
* @param results In here we accumulate all the Cells we are to return to the client. If null,
* client doesn't want results returned.
* @return Resulting Cells after <code>deltas</code> have been applied to current
* values. Side effect is our filling out of the <code>results</code> List.
*/
@ -8036,33 +8034,25 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
for (int i = 0; i < deltas.size(); i++) {
Cell delta = deltas.get(i);
Cell currentValue = null;
boolean firstWrite = false;
if (currentValuesIndex < currentValues.size() &&
CellUtil.matchingQualifier(currentValues.get(currentValuesIndex), delta)) {
currentValue = currentValues.get(currentValuesIndex);
if (i < (deltas.size() - 1) && !CellUtil.matchingQualifier(delta, deltas.get(i + 1))) {
currentValuesIndex++;
}
} else {
firstWrite = true;
}
// Switch on whether this an increment or an append building the new Cell to apply.
Cell newCell = null;
MutationType mutationType = null;
boolean apply = true;
switch (op) {
case INCREMENT:
mutationType = MutationType.INCREMENT;
// If delta amount to apply is 0, don't write WAL or MemStore.
long deltaAmount = getLongValue(delta);
// TODO: Does zero value mean reset Cell? For example, the ttl.
apply = deltaAmount != 0;
final long newValue = currentValue == null ? deltaAmount : getLongValue(currentValue) + deltaAmount;
newCell = reckonDelta(delta, currentValue, columnFamily, now, mutation, (oldCell) -> Bytes.toBytes(newValue));
break;
case APPEND:
mutationType = MutationType.APPEND;
// Always apply Append. TODO: Does empty delta value mean reset Cell? It seems to.
newCell = reckonDelta(delta, currentValue, columnFamily, now, mutation, (oldCell) ->
ByteBuffer.wrap(new byte[delta.getValueLength() + oldCell.getValueLength()])
.put(oldCell.getValueArray(), oldCell.getValueOffset(), oldCell.getValueLength())
@ -8078,10 +8068,7 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
newCell =
coprocessorHost.postMutationBeforeWAL(mutationType, mutation, currentValue, newCell);
}
// If apply, we need to update memstore/WAL with new value; add it toApply.
if (apply || firstWrite) {
toApply.add(newCell);
}
toApply.add(newCell);
// Add to results to get returned to the Client. If null, cilent does not want results.
if (results != null) {
results.add(newCell);

9
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestDurability.java
View File

@ -208,14 +208,13 @@ public class TestDurability {
assertEquals(1, Bytes.toLong(res.getValue(FAMILY, col1)));
verifyWALCount(wals, wal, 2);
// col1: amount = 0, 0 write back to WAL
// col1: amount = 0, 1 write back to WAL
inc1 = new Increment(row1);
inc1.addColumn(FAMILY, col1, 0);
res = region.increment(inc1);
assertEquals(1, res.size());
assertEquals(1, Bytes.toLong(res.getValue(FAMILY, col1)));
verifyWALCount(wals, wal, 2);
verifyWALCount(wals, wal, 3);
// col1: amount = 0, col2: amount = 0, col3: amount = 0
// 1 write back to WAL
inc1 = new Increment(row1);
@ -227,7 +226,7 @@ public class TestDurability {
assertEquals(1, Bytes.toLong(res.getValue(FAMILY, col1)));
assertEquals(0, Bytes.toLong(res.getValue(FAMILY, col2)));
assertEquals(0, Bytes.toLong(res.getValue(FAMILY, col3)));
verifyWALCount(wals, wal, 3);
verifyWALCount(wals, wal, 4);
// col1: amount = 5, col2: amount = 4, col3: amount = 3
// 1 write back to WAL
@ -240,7 +239,7 @@ public class TestDurability {
assertEquals(6, Bytes.toLong(res.getValue(FAMILY, col1)));
assertEquals(4, Bytes.toLong(res.getValue(FAMILY, col2)));
assertEquals(3, Bytes.toLong(res.getValue(FAMILY, col3)));
verifyWALCount(wals, wal, 4);
verifyWALCount(wals, wal, 5);
}
/**