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Added extra option to add readOnly thrift HMS uri (#308)
* Added extra option to add readOnly thrift HMS uri which will be called on read only calls for better spread of traffic
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Patrick Duin
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Feb 8, 2024
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95 changes: 95 additions & 0 deletions
95
...e/src/main/java/com/hotels/bdp/waggledance/client/SplitTrafficMetastoreClientFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /** | ||
| * Copyright (C) 2016-2024 Expedia, Inc. | ||
| * | ||
| * Licensed 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 com.hotels.bdp.waggledance.client; | ||
|
|
||
| import java.lang.reflect.InvocationHandler; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Proxy; | ||
|
|
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| /** | ||
| * This class splits the traffic for read only calls (get* for instance getTable, getPartition) to the readOnly client | ||
| * and everything else will go to readWrite client. | ||
| */ | ||
| public class SplitTrafficMetastoreClientFactory { | ||
|
|
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| static final Class<?>[] INTERFACES = new Class<?>[] { CloseableThriftHiveMetastoreIface.class }; | ||
|
|
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| private static class SplitTrafficClientInvocationHandler implements InvocationHandler { | ||
|
|
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| private static Logger log = LoggerFactory | ||
| .getLogger(SplitTrafficMetastoreClientFactory.SplitTrafficClientInvocationHandler.class); | ||
|
|
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| private final CloseableThriftHiveMetastoreIface readWrite; | ||
| private final CloseableThriftHiveMetastoreIface readOnly; | ||
|
|
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| public SplitTrafficClientInvocationHandler( | ||
| CloseableThriftHiveMetastoreIface readWrite, | ||
| CloseableThriftHiveMetastoreIface readOnly) { | ||
| this.readWrite = readWrite; | ||
| this.readOnly = readOnly; | ||
| } | ||
|
|
||
| @Override | ||
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { | ||
| switch (method.getName()) { | ||
| case "isOpen": | ||
| return readWrite.isOpen() && readOnly.isOpen(); | ||
| case "close": | ||
| try { | ||
| readWrite.close(); | ||
| } finally { | ||
| readOnly.close(); | ||
| } | ||
| return null; | ||
| case "set_ugi": | ||
| Object result = doRealCall(readWrite, method, args); | ||
| // we skip the result for readOnly (it should always be the same). | ||
| doRealCall(readOnly, method, args); | ||
| return result; | ||
| default: | ||
| if (method.getName().startsWith("get")) { | ||
| log.info("Calling {}.{}", "readOnly", method.getName()); | ||
| return doRealCall(readOnly, method, args); | ||
| } | ||
| log.info("Calling {}.{}", "readWrite", method.getName()); | ||
| return doRealCall(readWrite, method, args); | ||
| } | ||
| } | ||
|
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| private Object doRealCall(CloseableThriftHiveMetastoreIface client, Method method, Object[] args) | ||
| throws IllegalAccessException, Throwable { | ||
| try { | ||
| return method.invoke(client, args); | ||
| } catch (InvocationTargetException e) { | ||
| Throwable realException = e.getTargetException(); | ||
| throw realException; | ||
| } | ||
| } | ||
| } | ||
|
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| public CloseableThriftHiveMetastoreIface newInstance( | ||
| CloseableThriftHiveMetastoreIface readWrite, | ||
| CloseableThriftHiveMetastoreIface readOnly) { | ||
| return (CloseableThriftHiveMetastoreIface) Proxy | ||
| .newProxyInstance(getClass().getClassLoader(), INTERFACES, | ||
| new SplitTrafficClientInvocationHandler(readWrite, readOnly)); | ||
| } | ||
|
|
||
| } |
2 changes: 1 addition & 1 deletion
2
...e-core/src/main/java/com/hotels/bdp/waggledance/client/adapter/MetastoreIfaceAdapter.java
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2 changes: 1 addition & 1 deletion
2
...s/bdp/waggledance/client/compatibility/HiveCompatibleThriftHiveMetastoreIfaceFactory.java
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2 changes: 1 addition & 1 deletion
2
waggle-dance-core/src/main/java/com/hotels/bdp/waggledance/server/FederatedHMSHandler.java
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