[GitHub] [accumulo] ctubbsii commented on a change in pull request #2340: Client-side thread pools

[GitBox <gi...@apache.org>]

ctubbsii commented on a change in pull request #2340:
URL: https://github.com/apache/accumulo/pull/2340#discussion_r741297197



##########
File path: core/src/main/java/org/apache/accumulo/core/client/AccumuloClient.java
##########
@@ -338,6 +338,13 @@ ConditionalWriter createConditionalWriter(String tableName, ConditionalWriterCon
   @Override
   void close();
 
+  /**
+   * Sets a user-defined ClientThreadPools implementation
+   *
+   * @param impl

Review comment:
       javadoc quality: remove tag if no description, or add description

##########
File path: core/src/main/java/org/apache/accumulo/core/client/ClientThreadPools.java
##########
@@ -0,0 +1,136 @@
+/*
+ * 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.accumulo.core.client;
+
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.ThreadPoolExecutor;
+
+import org.apache.accumulo.core.clientImpl.ClientContext;
+
+public interface ClientThreadPools {
+
+  /**
+   * return a shared scheduled executor for trivial tasks
+   *
+   * @param ctx
+   * @return ScheduledThreadPoolExecutor
+   */
+  ScheduledThreadPoolExecutor getSharedScheduledExecutor(ClientContext context);
+
+  /**
+   * ThreadPoolExecutor that runs bulk import tasks
+   *
+   * @param ctx
+   * @param numThreads
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getBulkImportThreadPool(ClientContext ctx, int numThreads);
+
+  /**
+   * ThreadPoolExecutor that runs tasks to contact Compactors to get running compaction information
+   *
+   * @param numThreads
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getExternalCompactionActiveCompactionsPool(ClientContext ctx, int numThreads);
+
+  /**
+   * ThreadPoolExecutor used for fetching data from the TabletServers
+   *
+   * @param ctx
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getScannerReadAheadPool(ClientContext ctx);
+
+  /**
+   * ThreadPoolExecutor used for adding splits to a table
+   *
+   * @param ctx
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getAddSplitsThreadPool(ClientContext ctx);
+
+  /**
+   * ThreadPoolExecutor used for fetching data from the TabletServers
+   *
+   * @param ctx
+   * @param numQueryThreads
+   * @param batchReaderInstance
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getBatchReaderThreadPool(ClientContext ctx, int numQueryThreads,
+      int batchReaderInstance);
+
+  /**
+   * ScheduledThreadPoolExecutor that runs tasks for the BatchWriter to meet the users latency
+   * goals.
+   * 
+   * @param ctx
+   *          client context object
+   * @return ScheduledThreadPoolExecutor
+   */
+  ScheduledThreadPoolExecutor getBatchWriterLatencyTasksThreadPool(ClientContext ctx);
+
+  /**
+   * ThreadPoolExecutor that runs the tasks of binning mutations
+   * 
+   * @param ctx
+   *          client context object
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getBatchWriterBinningThreadPool(ClientContext ctx);
+
+  /**
+   * ThreadPoolExecutor that runs the tasks of sending mutations to TabletServers
+   *
+   * @param ctx
+   *          client context object
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getBatchWriterSendThreadPool(ClientContext ctx, int numSendThreads);
+
+  /**
+   * ThreadPoolExecutor that runs clean up tasks when close is called on the ConditionalWriter
+   *
+   * @param ctx
+   * @return ThreadPoolExecutor
+   */
+  ThreadPoolExecutor getConditionalWriterCleanupTaskThreadPool(ClientContext ctx);

Review comment:
       Having one central location that entagles itself with so many disparate public API methods seems less than ideal. I think it would be better if each entry point (batch scanner, batch writer, conditional writer, etc.) added an option to their existing builders/config to set a thread pool... or more narrowly, just an uncaught exception handler for the thread pools we manage internally.

##########
File path: core/src/main/java/org/apache/accumulo/core/client/ClientThreadPools.java
##########
@@ -0,0 +1,136 @@
+/*
+ * 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.accumulo.core.client;
+
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.ThreadPoolExecutor;
+
+import org.apache.accumulo.core.clientImpl.ClientContext;
+
+public interface ClientThreadPools {
+
+  /**
+   * return a shared scheduled executor for trivial tasks
+   *
+   * @param ctx
+   * @return ScheduledThreadPoolExecutor
+   */
+  ScheduledThreadPoolExecutor getSharedScheduledExecutor(ClientContext context);

Review comment:
       ClientContext is not public API, and should not be

##########
File path: core/src/main/java/org/apache/accumulo/core/util/threads/AccumuloUncaughtExceptionHandler.java
##########
@@ -44,7 +46,10 @@ public void uncaughtException(Thread t, Throwable e) {
         // If e == OutOfMemoryError, then it's probably that another Error might be
         // thrown when trying to print to System.err.
       } finally {
-        Runtime.getRuntime().halt(-1);
+        Mode m = SingletonManager.getMode();
+        if (m != null && m.equals(Mode.SERVER)) {
+          Runtime.getRuntime().halt(-1);
+        }

Review comment:
       Rather than making this handler behave differently in some circumstances, why not make it so a different handler can be configured instead?

##########
File path: core/src/main/java/org/apache/accumulo/core/clientImpl/bulk/BulkImport.java
##########
@@ -229,6 +228,7 @@ private Path checkPath(FileSystem fs, String dir) throws IOException, AccumuloEx
   }
 
   @Override
+  @Deprecated(since = "2.1.0")
   public ImportMappingOptions executor(Executor service) {

Review comment:
       It's not clear. Why is this option being deprecated in the bulk import builder?




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