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HBASE-22447 Check refCount before free block in BucketCache

This commit is contained in:
binlijin 2019-05-22 16:19:08 +08:00
parent 5b24d4e1bc
commit 81dc712779
1 changed files with 10 additions and 34 deletions
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40
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java
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@ -554,37 +554,6 @@ public class BucketCache implements BlockCache, HeapSize {
return evictBlock(cacheKey, true);
}
// does not check for the ref count. Just tries to evict it if found in the
// bucket map
private boolean forceEvict(BlockCacheKey cacheKey) {
if (!cacheEnabled) {
return false;
}
RAMQueueEntry removedBlock = checkRamCache(cacheKey);
BucketEntry bucketEntry = backingMap.get(cacheKey);
if (bucketEntry == null) {
if (removedBlock != null) {
cacheStats.evicted(0, cacheKey.isPrimary());
return true;
} else {
return false;
}
}
ReentrantReadWriteLock lock = offsetLock.getLock(bucketEntry.offset());
try {
lock.writeLock().lock();
if (backingMap.remove(cacheKey, bucketEntry)) {
blockEvicted(cacheKey, bucketEntry, removedBlock == null);
} else {
return false;
}
} finally {
lock.writeLock().unlock();
}
cacheStats.evicted(bucketEntry.getCachedTime(), cacheKey.isPrimary());
return true;
}
private RAMQueueEntry checkRamCache(BlockCacheKey cacheKey) {
RAMQueueEntry removedBlock = ramCache.remove(cacheKey);
if (removedBlock != null) {
@ -1046,8 +1015,15 @@ public class BucketCache implements BlockCache, HeapSize {
ReentrantReadWriteLock lock = offsetLock.getLock(bucketEntries[i].offset());
try {
lock.writeLock().lock();
int refCount = bucketEntries[i].getRefCount();
if (refCount == 0) {
if (backingMap.remove(key, bucketEntries[i])) {
blockEvicted(key, bucketEntries[i], false);
} else {
bucketEntries[i].markForEvict();
}
} else {
bucketEntries[i].markForEvict();
}
} finally {
lock.writeLock().unlock();
@ -1666,7 +1642,7 @@ public class BucketCache implements BlockCache, HeapSize {
if (bucketEntry != null) {
int refCount = bucketEntry.decrementRefCountAndGet();
if (refCount == 0 && bucketEntry.isMarkedForEvict()) {
forceEvict(cacheKey);
evictBlock(cacheKey);
}
}
}