[
https://issues.apache.org/jira/browse/HIVE-23069?focusedWorklogId=457132&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-457132
]
ASF GitHub Bot logged work on HIVE-23069:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 10/Jul/20 12:35
Start Date: 10/Jul/20 12:35
Worklog Time Spent: 10m
Work Description: pkumarsinha commented on a change in pull request #1225:
URL: https://github.com/apache/hive/pull/1225#discussion_r452815017
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/repl/util/FileListStreamer.java
##########
@@ -0,0 +1,137 @@
+/*
+ * 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.hadoop.hive.ql.exec.repl.util;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hive.ql.parse.SemanticException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.BufferedWriter;
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+public class FileListStreamer extends Thread implements Closeable {
+ private static final Logger LOG =
LoggerFactory.getLogger(FileListStreamer.class);
+ private static final long TIMEOUT_IN_SECS = 5L;
+ private volatile boolean stop;
+ private final LinkedBlockingQueue<String> cache;
+ private Path backingFile;
+ private Configuration conf;
+ private BufferedWriter backingFileWriter;
+ private volatile boolean valid = true;
+ private volatile boolean asyncMode = false;
+ private final Object COMPLETION_LOCK = new Object();
+ private volatile boolean completed = false;
+
+
+
+ public FileListStreamer(LinkedBlockingQueue<String> cache, Path backingFile,
Configuration conf) throws IOException {
+ this.cache = cache;
+ this.backingFile = backingFile;
+ this.conf = conf;
+ init();
+ }
+
+ private void init() throws IOException {
+ FileSystem fs = FileSystem.get(backingFile.toUri(), conf);
+ backingFileWriter = new BufferedWriter(new
OutputStreamWriter(fs.create(backingFile, !asyncMode)));
+ LOG.info("Initialized a file based store to save a list at: {},
ayncMode:{}", backingFile, asyncMode);
+ }
+
+ public boolean isValid() {
+ return valid;
+ }
+
+ @Override
+ public void close() throws IOException {
+ if (!asyncMode) {
+ closeBackingFile();
+ return;
+ }
+ stop = true;
+ synchronized (COMPLETION_LOCK) {
+ while (!completed && isValid()) {
+ try {
+ COMPLETION_LOCK.wait(TimeUnit.SECONDS.toMillis(TIMEOUT_IN_SECS));
+ } catch (InterruptedException e) {
+ }
+ }
+ }
+ if (!isValid()) {
Review comment:
No, it can't be moved above as this ensures the correctness of the
consumption of the remaining entries from the cache.
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Issue Time Tracking
-------------------
Worklog Id: (was: 457132)
Time Spent: 2h 10m (was: 2h)
> Memory efficient iterator should be used during replication.
> ------------------------------------------------------------
>
> Key: HIVE-23069
> URL: https://issues.apache.org/jira/browse/HIVE-23069
> Project: Hive
> Issue Type: Improvement
> Reporter: Pravin Sinha
> Assignee: Pravin Sinha
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-23069.01.patch
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> Currently the iterator used while copying table data is memory based. In case
> of a database with very large number of table/partitions, such iterator may
> cause HS2 process to go OOM.
> Also introduces a config option to run data copy tasks during repl load
> operation.
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