Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/574#discussion_r78292785
--- 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;
+
+ public RemoteFunctionRegistry(TransientStoreListener
unregistrationListener) {
+ this.unregistrationListener = unregistrationListener;
+ }
+
+ public void init(DrillConfig config, PersistentStoreProvider
storeProvider, ClusterCoordinator coordinator) {
+ try {
+ PersistentStoreConfig<Registry> registrationConfig =
PersistentStoreConfig
+ .newProtoBuilder(SchemaUserBitShared.Registry.WRITE,
SchemaUserBitShared.Registry.MERGE)
+ .name("udf")
+ .persist()
+ .build();
+ registry = storeProvider.getOrCreateStore(registrationConfig);
+ registry.putIfAbsent(REGISTRY, Registry.getDefaultInstance());
+ } catch (StoreException e) {
+ throw new DrillRuntimeException("Failure while loading remote
registry.", e);
+ }
+
+ TransientStoreConfig<String> unregistrationConfig =
TransientStoreConfig.
+ newJacksonBuilder(mapper,
String.class).name("udf/unregister").build();
+ unregistration =
coordinator.getOrCreateTransientStore(unregistrationConfig);
+ unregistration.addListener(unregistrationListener);
+
+ TransientStoreConfig<String> jarsConfig = TransientStoreConfig.
+ newJacksonBuilder(mapper, String.class).name("udf/jars").build();
+ jars = coordinator.getOrCreateTransientStore(jarsConfig);
+
+ this.retryTimes = config.getInt(ExecConstants.UDF_RETRY_TIMES);
+
+ Configuration conf = new Configuration();
+ if (config.hasPath(ExecConstants.UDF_DIRECTORY_FS)) {
+ conf.set(FileSystem.FS_DEFAULT_NAME_KEY,
config.getString(ExecConstants.UDF_DIRECTORY_FS));
+ }
+
+ try {
+ this.fs = FileSystem.get(conf);
+ String base = config.getString(ExecConstants.UDF_DIRECTORY_BASE);
+ this.registryArea = createArea(fs, base,
config.getString(ExecConstants.UDF_DIRECTORY_REGISTRY));
+ this.stagingArea = createArea(fs, base,
config.getString(ExecConstants.UDF_DIRECTORY_STAGING));
+ this.tmpArea = createArea(fs, base,
config.getString(ExecConstants.UDF_DIRECTORY_TMP));
+ } catch (IOException e) {
+ throw new DrillRuntimeException("Error during areas creation for
remote function registry.", e);
--- End diff --
Agree. I'll add appropriate error message in createArea method.
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