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From arina-ielchiieva <...@git.apache.org>
Subject [GitHub] drill pull request #574: DRILL-4726: Dynamic UDFs support
Date Sun, 11 Sep 2016 12:05:05 GMT
Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/574#discussion_r78293473
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/RemoteFunctionRegistry.java
---
    @@ -0,0 +1,185 @@
    +/**
    + * 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
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * 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.drill.exec.expr.fn;
    +
    +import com.fasterxml.jackson.databind.ObjectMapper;
    +import org.apache.commons.io.FilenameUtils;
    +import org.apache.drill.common.config.DrillConfig;
    +import org.apache.drill.common.exceptions.DrillRuntimeException;
    +import org.apache.drill.exec.ExecConstants;
    +import org.apache.drill.exec.coord.ClusterCoordinator;
    +import org.apache.drill.exec.coord.store.TransientStore;
    +import org.apache.drill.exec.coord.store.TransientStoreConfig;
    +import org.apache.drill.exec.coord.store.TransientStoreListener;
    +import org.apache.drill.exec.exception.StoreException;
    +import org.apache.drill.exec.exception.VersionMismatchException;
    +import org.apache.drill.exec.proto.SchemaUserBitShared;
    +import org.apache.drill.exec.proto.UserBitShared.Registry;
    +import org.apache.drill.exec.store.sys.PersistentStore;
    +import org.apache.drill.exec.store.sys.PersistentStoreConfig;
    +import org.apache.drill.exec.store.sys.PersistentStoreProvider;
    +import org.apache.drill.exec.store.sys.store.DataChangeVersion;
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.fs.FileSystem;
    +import org.apache.hadoop.fs.Path;
    +
    +import java.io.IOException;
    +
    +import static com.fasterxml.jackson.databind.SerializationFeature.INDENT_OUTPUT;
    +
    +/** Is responsible for remote function registry management.
    + *  Creates all remote registry areas at startup, during init establishes connections
with stores.
    + *  Provides tools to update remote registry and unregister functions, access remote
registry areas.
    + */
    +public class RemoteFunctionRegistry implements AutoCloseable {
    +
    +  public static final String REGISTRY = "registry";
    +
    +  private static final ObjectMapper mapper = new ObjectMapper().enable(INDENT_OUTPUT);
    +
    +  private final TransientStoreListener unregistrationListener;
    +  private int retryTimes;
    +  private FileSystem fs;
    +  private Path registryArea;
    +  private Path stagingArea;
    +  private Path tmpArea;
    +
    +  private PersistentStore<Registry> registry;
    +  private TransientStore<String> unregistration;
    +  private TransientStore<String> jars;
    --- End diff --
    
    Transient store concept creation in Drill is the following:
    when you connect to transient store you need to indicate the name (ex: name("udf/unregister")),
Drill creates this path as persistent znode but anything else that you'll create under this
znode will be transient.
    I'll add some comments how it works.


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