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https://issues.apache.org/jira/browse/STORM-885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15018769#comment-15018769
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ASF GitHub Bot commented on STORM-885:
--------------------------------------
Github user d2r commented on a diff in the pull request:
https://github.com/apache/storm/pull/838#discussion_r45517616
--- Diff:
storm-core/src/jvm/org/apache/storm/pacemaker/codec/ThriftDecoder.java ---
@@ -0,0 +1,77 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.storm.pacemaker.codec;
+
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.channel.Channel;
+import backtype.storm.generated.HBMessage;
+import backtype.storm.generated.HBMessageData;
+import backtype.storm.generated.HBServerMessageType;
+import org.jboss.netty.buffer.ChannelBuffer;
+import backtype.storm.utils.Utils;
+import backtype.storm.messaging.netty.ControlMessage;
+import backtype.storm.messaging.netty.SaslMessageToken;
+
+public class ThriftDecoder extends FrameDecoder {
+
+ @Override
+ protected Object decode(ChannelHandlerContext ctx, Channel channel,
ChannelBuffer buf) throws Exception {
+
+ long available = buf.readableBytes();
+ if(available < 2) {
+ return null;
+ }
+
+ buf.markReaderIndex();
+
+ int thriftLen = buf.readInt();
+ available -= 4;
+
+ if(available < thriftLen) {
+ // We haven't received the entire object yet, return and wait
for more bytes.
+ buf.resetReaderIndex();
+ return null;
+ }
+
+ buf.discardReadBytes();
+
+ HBMessage m;
+ if(buf.hasArray()) {
+ m = (HBMessage)Utils.thriftDeserialize(HBMessage.class,
buf.array(), 0, thriftLen);
--- End diff --
here and below: thriftDeserialize is generic so it doesn't need the cast.
> Heartbeat Server (Pacemaker)
> ----------------------------
>
> Key: STORM-885
> URL: https://issues.apache.org/jira/browse/STORM-885
> Project: Apache Storm
> Issue Type: Improvement
> Components: storm-core
> Reporter: Robert Joseph Evans
> Assignee: Kyle Nusbaum
>
> Large highly connected topologies and large clusters write a lot of data into
> ZooKeeper. The heartbeats, that make up the majority of this data, do not
> need to be persisted to disk. Pacemaker is intended to be a secure
> replacement for storing the heartbeats without changing anything within the
> heartbeats. In the future as more metrics are added in, we may want to look
> into switching it over to look more like Heron, where a metrics server is
> running for each node/topology. And can be used to aggregate/per-aggregate
> them in a more scalable manor.
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