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The following commit(s) were added to refs/heads/trunk by this push:
new ea3b0a1 HDFS-14535. The default 8KB buffer in
requestFileDescriptors#BufferedOutputStream is causing lots of heap allocation
in HBase when using short-circut read
ea3b0a1 is described below
commit ea3b0a184405c3feca024a560807ea215b6858b9
Author: huzheng <[email protected]>
AuthorDate: Tue Jun 4 10:54:46 2019 +0800
HDFS-14535. The default 8KB buffer in
requestFileDescriptors#BufferedOutputStream is causing lots of heap allocation
in HBase when using short-circut read
---
.../java/org/apache/hadoop/hdfs/client/impl/BlockReaderFactory.java | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderFactory.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderFactory.java
index 8e592f4..88b1686 100644
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderFactory.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderFactory.java
@@ -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 {
@@ -582,7 +583,7 @@ 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());
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