[pulsar] branch master updated: Reduce number of hashmap sections for ledger handles cache (#4102)

[mmerli]

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mmerli pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/pulsar.git


The following commit(s) were added to refs/heads/master by this push:
     new ccea624  Reduce number of hashmap sections for ledger handles cache 
(#4102)
ccea624 is described below

commit ccea6245bc08358e1ccccb55aa4cd20c7c8b534d
Author: Matteo Merli <mme...@apache.org>
AuthorDate: Tue Apr 23 10:41:24 2019 -0700

    Reduce number of hashmap sections for ledger handles cache (#4102)
---
 .../java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git 
a/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
 
b/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
index e19b913..eea6c1f 100644
--- 
a/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
+++ 
b/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java
@@ -117,7 +117,6 @@ import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.util.Recycler;
 import io.netty.util.Recycler.Handle;
-import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import static org.apache.bookkeeper.mledger.impl.ManagedCursorImpl.TRUE;
 import static org.apache.bookkeeper.mledger.impl.ManagedCursorImpl.FALSE;
@@ -137,7 +136,8 @@ public class ManagedLedgerImpl implements ManagedLedger, 
CreateCallback {
     protected ManagedLedgerConfig config;
     protected final MetaStore store;
 
-    private final ConcurrentLongHashMap<CompletableFuture<ReadHandle>> 
ledgerCache = new ConcurrentLongHashMap<>();
+    private final ConcurrentLongHashMap<CompletableFuture<ReadHandle>> 
ledgerCache = new ConcurrentLongHashMap<>(
+            16 /* initial capacity */, 1 /* number of sections */);
     protected final NavigableMap<Long, LedgerInfo> ledgers = new 
ConcurrentSkipListMap<>();
     private volatile Stat ledgersStat;