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HBASE-783 For single row, single family retrieval, getRow() works half as fast as getScanner().next() 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@680910 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2008-07-30 04:37:06 +00:00
parent 410a8266c0
commit 809180eef2
3 changed files with 25 additions and 5 deletions
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2
CHANGES.txt
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@ -324,6 +324,8 @@ Release 0.2.0
HBASE-746 Batching row mutations via thrift (Tim Sell via Stack) HBASE-746 Batching row mutations via thrift (Tim Sell via Stack)
HBASE-772 Up default lease period from 60 to 120 seconds HBASE-772 Up default lease period from 60 to 120 seconds
HBASE-779 Test changing hbase.hregion.memcache.block.multiplier to 2 HBASE-779 Test changing hbase.hregion.memcache.block.multiplier to 2
HBASE-783 For single row, single family retrieval, getRow() works half
as fast as getScanner().next() (Jean-Daniel Cryans via Stack)
NEW FEATURES NEW FEATURES
HBASE-47 Option to set TTL for columns in hbase HBASE-47 Option to set TTL for columns in hbase

25
src/java/org/apache/hadoop/hbase/regionserver/HRegion.java
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@ -1181,23 +1181,40 @@ public class HRegion implements HConstants {
} }
HStoreKey key = new HStoreKey(row, ts); HStoreKey key = new HStoreKey(row, ts);
Integer lid = obtainRowLock(row); Integer lid = obtainRowLock(row);
HashSet<HStore> storeSet = new HashSet<HStore>();
try { try {
TreeMap<byte [], Cell> result = TreeMap<byte [], Cell> result =
new TreeMap<byte [], Cell>(Bytes.BYTES_COMPARATOR); new TreeMap<byte [], Cell>(Bytes.BYTES_COMPARATOR);
for (HStore targetStore: stores.values()) { // Get the concerned columns or all of them
targetStore.getFull(key, columns, result); if (columns != null) {
for (byte[] bs : columns) {
HStore store = stores.get(Bytes.mapKey(HStoreKey.getFamily(bs)));
if (store != null) {
storeSet.add(store);
}
}
} }
// Previous step won't fetch whole families: HBASE-631. else
storeSet.addAll(stores.values());
// For each column name that is just a column family, open the store // For each column name that is just a column family, open the store
// related to it and fetch everything for that row. // related to it and fetch everything for that row. HBASE-631
// Also remove each store from storeSet so that these stores
// won't be opened for no reason. HBASE-783
if (columns != null) { if (columns != null) {
for (byte[] bs : columns) { for (byte[] bs : columns) {
if (HStoreKey.getFamilyDelimiterIndex(bs) == (bs.length - 1)) { if (HStoreKey.getFamilyDelimiterIndex(bs) == (bs.length - 1)) {
HStore store = stores.get(Bytes.mapKey(HStoreKey.getFamily(bs))); HStore store = stores.get(Bytes.mapKey(HStoreKey.getFamily(bs)));
store.getFull(key, null, result); store.getFull(key, null, result);
storeSet.remove(store);
} }
} }
} }
for (HStore targetStore: storeSet) {
targetStore.getFull(key, columns, result);
}
return result; return result;
} finally { } finally {
releaseRowLock(lid); releaseRowLock(lid);

3
src/java/org/apache/hadoop/hbase/regionserver/HStore.java
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@ -752,7 +752,8 @@ public class HStore implements HConstants {
// last key of storefiles. // last key of storefiles.
maxId = this.storefiles.lastKey().longValue(); maxId = this.storefiles.lastKey().longValue();
} }
if (!force && filesToCompact.size() < compactionThreshold) { if (!force && !hasReferences(filesToCompact) &&
filesToCompact.size() < compactionThreshold) {
return checkSplit(); return checkSplit();
} }
if (!fs.exists(compactionDir) && !fs.mkdirs(compactionDir)) { if (!fs.exists(compactionDir) && !fs.mkdirs(compactionDir)) {