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https://issues.apache.org/jira/browse/HIVE-24270?focusedWorklogId=502191&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-502191
]
ASF GitHub Bot logged work on HIVE-24270:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Oct/20 13:31
Start Date: 19/Oct/20 13:31
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on a change in pull request #1577:
URL: https://github.com/apache/hive/pull/1577#discussion_r507744113
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/PathCleaner.java
##########
@@ -0,0 +1,117 @@
+/*
+ * 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;
+
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.concurrent.BlockingDeque;
+import java.util.concurrent.LinkedBlockingDeque;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * This class is used to asynchronously remove directories after query
execution
+ */
+public class PathCleaner {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(PathCleaner.class.getName());
+ private static final AsyncDeleteAction END_OF_PROCESS = new
AsyncDeleteAction(null, null);
+
+ private final BlockingDeque<AsyncDeleteAction> deleteActions = new
LinkedBlockingDeque<>();
+ private final AtomicBoolean isShutdown = new AtomicBoolean();
Review comment:
note: all usages are negated for this boolean - instead of using
negative logic (shutdown) ; using a positive name like "run" might make things
easier to read/follow
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/Context.java
##########
@@ -673,22 +673,27 @@ public void removeScratchDir() {
if(this.fsResultCacheDirs != null) {
resultCacheDir = this.fsResultCacheDirs.toUri().getPath();
}
- for (Map.Entry<String, Path> entry : fsScratchDirs.entrySet()) {
+ SessionState sessionState = SessionState.get();
+ for (Path p: fsScratchDirs.values()) {
try {
- Path p = entry.getValue();
if (p.toUri().getPath().contains(stagingDir) && subDirOf(p,
fsScratchDirs.values()) ) {
LOG.debug("Skip deleting stagingDir: " + p);
FileSystem fs = p.getFileSystem(conf);
fs.cancelDeleteOnExit(p);
continue; // staging dir is deleted when deleting the scratch dir
}
- if(resultCacheDir == null ||
!p.toUri().getPath().contains(resultCacheDir)) {
+ if (resultCacheDir == null ||
!p.toUri().getPath().contains(resultCacheDir)) {
// delete only the paths which aren't result cache dir path
// because that will be taken care by removeResultCacheDir
- FileSystem fs = p.getFileSystem(conf);
- LOG.debug("Deleting scratch dir: {}", p);
- fs.delete(p, true);
- fs.cancelDeleteOnExit(p);
+ FileSystem fs = p.getFileSystem(conf);
+ if (sessionState.isSyncContextCleanup()) {
Review comment:
I think another approach could be to create 2 PathCleaner
implementations - the existing Async and the synch one; that could create a
tighter contract seal between the usage and the implementations.
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/DriverUtils.java
##########
@@ -61,6 +61,7 @@ public static void runOnDriver(HiveConf conf, String user,
throw new
IllegalArgumentException(JavaUtils.txnIdToString(compactorTxnId) +
" is not valid. Context: " + query);
}
+ sessionState.setSyncCleanup();
Review comment:
this is a one-way switch; so there is no way to switch back to the
earlier behaviour
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/session/SessionState.java
##########
@@ -388,6 +397,19 @@ public boolean getIsQtestLogging() {
return isQtestLogging;
}
+ public PathCleaner getPathCleaner() {
+ if (pathCleaner == null) {
+ pathCleaner = new PathCleaner(getSessionId());
+ pathCleaner.start();
+ }
+ return pathCleaner;
+ }
+
+ public void setSyncCleanup() {
+ pathCleaner = null;
Review comment:
I think in case `pathCleaner` is initialized - after calling this a
thread will be left running in the background
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Issue Time Tracking
-------------------
Worklog Id: (was: 502191)
Time Spent: 40m (was: 0.5h)
> Move scratchdir cleanup to background
> -------------------------------------
>
> Key: HIVE-24270
> URL: https://issues.apache.org/jira/browse/HIVE-24270
> Project: Hive
> Issue Type: Improvement
> Reporter: Mustafa Iman
> Assignee: Mustafa Iman
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> In cloud environment, scratchdir cleaning at the end of the query may take
> long time. This causes client to hang up to 1 minute even after the results
> were streamed back. During this time client just waits for cleanup to finish.
> Cleanup can take place in the background in HiveServer.
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