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HDFS-14535. The default 8KB buffer in requestFileDescriptors#BufferedOutputStream is causing lots of heap allocation in HBase when using short-circut read 

(cherry picked from commit ea3b0a1844)
(cherry picked from commit 9b61ecfcbe)
(cherry picked from commit b082628e5a)
This commit is contained in:
huzheng 2019-06-04 10:54:46 +08:00 committed by Wei-Chiu Chuang
parent 1be7c42cb7
commit 2b9c4fccf4
1 changed files with 2 additions and 1 deletions
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hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderFactory.java
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@ -86,6 +86,7 @@ import org.slf4j.LoggerFactory;
@InterfaceAudience.Private
public class BlockReaderFactory implements ShortCircuitReplicaCreator {
static final Logger LOG = LoggerFactory.getLogger(BlockReaderFactory.class);
private static final int SMALL_BUFFER_SIZE = 512;
public static class FailureInjector {
public void injectRequestFileDescriptorsFailure() throws IOException {
@ -578,7 +579,7 @@ public class BlockReaderFactory implements ShortCircuitReplicaCreator {
Slot slot) throws IOException {
ShortCircuitCache cache = clientContext.getShortCircuitCache();
final DataOutputStream out =
new DataOutputStream(new BufferedOutputStream(peer.getOutputStream()));
new DataOutputStream(new BufferedOutputStream(peer.getOutputStream(), SMALL_BUFFER_SIZE));
SlotId slotId = slot == null ? null : slot.getSlotId();
new Sender(out).requestShortCircuitFds(block, token, slotId, 1,
failureInjector.getSupportsReceiptVerification());