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HBASE-8264 expose the number of seen KVs from StoreScanner 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1469668 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
sershe 2013-04-19 02:29:54 +00:00
parent 35038df81d
commit efc32c83ba
1 changed files with 14 additions and 0 deletions
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14
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
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@ -73,6 +73,12 @@ public class StoreScanner extends NonLazyKeyValueScanner
protected final long oldestUnexpiredTS;
protected final int minVersions;
/**
* The number of KVs seen by the scanner. Includes explicitly skipped KVs, but not
* KVs skipped via seeking to next row/column. TODO: estimate them?
*/
private long kvsScanned = 0;
/** We don't ever expect to change this, the constant is just for clarity. */
static final boolean LAZY_SEEK_ENABLED_BY_DEFAULT = true;
public static final String STORESCANNER_PARALLEL_SEEK_ENABLE =
@ -390,6 +396,7 @@ public class StoreScanner extends NonLazyKeyValueScanner
int count = 0;
LOOP: while((kv = this.heap.peek()) != null) {
++kvsScanned;
// Check that the heap gives us KVs in an increasing order.
assert prevKV == null || comparator == null || comparator.compare(prevKV, kv) <= 0 :
"Key " + prevKV + " followed by a " + "smaller key " + kv + " in cf " + store;
@ -649,5 +656,12 @@ public class StoreScanner extends NonLazyKeyValueScanner
static void enableLazySeekGlobally(boolean enable) {
lazySeekEnabledGlobally = enable;
}
/**
* @return The estimated number of KVs seen by this scanner (includes some skipped KVs).
*/
public long getEstimatedNumberOfKvsScanned() {
return this.kvsScanned;
}
}