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HBASE-23356 When construct StoreScanner throw exceptions it is possible to left some KeyValueScanner not closed. (#891) 

Signed-off-by: GuangxuCheng  <guangxucheng@gmail.com>
This commit is contained in:
binlijin 2019-12-04 10:34:07 +08:00 committed by GitHub
parent 0f166edc3d
commit 580d65ee4d
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 47 additions and 20 deletions
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60
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
View File

@ -1270,18 +1270,34 @@ public class HStore implements Store, HeapSize, StoreConfigInformation, Propagat
this.lock.readLock().unlock();
}
// First the store file scanners
try {
// First the store file scanners
// TODO this used to get the store files in descending order,
// but now we get them in ascending order, which I think is
// actually more correct, since memstore get put at the end.
List<StoreFileScanner> sfScanners = StoreFileScanner.getScannersForStoreFiles(storeFilesToScan,
cacheBlocks, usePread, isCompaction, false, matcher, readPt);
List<KeyValueScanner> scanners = new ArrayList<>(sfScanners.size() + 1);
scanners.addAll(sfScanners);
// Then the memstore scanners
scanners.addAll(memStoreScanners);
return scanners;
// TODO this used to get the store files in descending order,
// but now we get them in ascending order, which I think is
// actually more correct, since memstore get put at the end.
List<StoreFileScanner> sfScanners = StoreFileScanner
.getScannersForStoreFiles(storeFilesToScan, cacheBlocks, usePread, isCompaction, false,
matcher, readPt);
List<KeyValueScanner> scanners = new ArrayList<>(sfScanners.size() + 1);
scanners.addAll(sfScanners);
// Then the memstore scanners
scanners.addAll(memStoreScanners);
return scanners;
} catch (Throwable t) {
clearAndClose(memStoreScanners);
throw t instanceof IOException ? (IOException) t : new IOException(t);
}
}
private static void clearAndClose(List<KeyValueScanner> scanners) {
if (scanners == null) {
return;
}
for (KeyValueScanner s : scanners) {
s.close();
}
scanners.clear();
}
/**
@ -1335,15 +1351,21 @@ public class HStore implements Store, HeapSize, StoreConfigInformation, Propagat
this.lock.readLock().unlock();
}
}
List<StoreFileScanner> sfScanners = StoreFileScanner.getScannersForStoreFiles(files,
cacheBlocks, usePread, isCompaction, false, matcher, readPt);
List<KeyValueScanner> scanners = new ArrayList<>(sfScanners.size() + 1);
scanners.addAll(sfScanners);
// Then the memstore scanners
if (memStoreScanners != null) {
scanners.addAll(memStoreScanners);
try {
List<StoreFileScanner> sfScanners = StoreFileScanner
.getScannersForStoreFiles(files, cacheBlocks, usePread, isCompaction, false, matcher,
readPt);
List<KeyValueScanner> scanners = new ArrayList<>(sfScanners.size() + 1);
scanners.addAll(sfScanners);
// Then the memstore scanners
if (memStoreScanners != null) {
scanners.addAll(memStoreScanners);
}
return scanners;
} catch (Throwable t) {
clearAndClose(memStoreScanners);
throw t instanceof IOException ? (IOException) t : new IOException(t);
}
return scanners;
}
/**

7
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
View File

@ -236,9 +236,10 @@ public class StoreScanner extends NonReversedNonLazyKeyValueScanner
store.addChangedReaderObserver(this);
List<KeyValueScanner> scanners = null;
try {
// Pass columns to try to filter out unnecessary StoreFiles.
List<KeyValueScanner> scanners = selectScannersFrom(store,
scanners = selectScannersFrom(store,
store.getScanners(cacheBlocks, scanUsePread, false, matcher, scan.getStartRow(),
scan.includeStartRow(), scan.getStopRow(), scan.includeStopRow(), this.readPt));
@ -258,6 +259,7 @@ public class StoreScanner extends NonReversedNonLazyKeyValueScanner
// Combine all seeked scanners with a heap
resetKVHeap(scanners, comparator);
} catch (IOException e) {
clearAndClose(scanners);
// remove us from the HStore#changedReaderObservers here or we'll have no chance to
// and might cause memory leak
store.deleteChangedReaderObserver(this);
@ -870,6 +872,9 @@ public class StoreScanner extends NonReversedNonLazyKeyValueScanner
}
private static void clearAndClose(List<KeyValueScanner> scanners) {
if (scanners == null) {
return;
}
for (KeyValueScanner s : scanners) {
s.close();
}