[
https://issues.apache.org/jira/browse/HIVE-24718?focusedWorklogId=555763&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-555763
]
ASF GitHub Bot logged work on HIVE-24718:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Feb/21 11:55
Start Date: 22/Feb/21 11:55
Worklog Time Spent: 10m
Work Description: pkumarsinha commented on a change in pull request #1936:
URL: https://github.com/apache/hive/pull/1936#discussion_r580192079
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/repl/util/FileList.java
##########
@@ -18,158 +18,176 @@
package org.apache.hadoop.hive.ql.exec.repl.util;
-import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.ql.ErrorMsg;
+import org.apache.hadoop.hive.ql.exec.util.Retryable;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
+import java.io.StringWriter;
+import java.io.UncheckedIOException;
import java.util.Iterator;
import java.util.NoSuchElementException;
-import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.Callable;
-
-/**
- * A file backed list of Strings which is in-memory till the threshold.
- */
public class FileList implements AutoCloseable, Iterator<String> {
private static final Logger LOG = LoggerFactory.getLogger(FileList.class);
- private static int fileListStreamerID = 0;
- private static final String FILE_LIST_STREAMER_PREFIX =
"file-list-streamer-";
-
- private LinkedBlockingQueue<String> cache;
- private volatile boolean thresholdHit = false;
- private int thresholdPoint;
- private float thresholdFactor = 0.9f;
- private Path backingFile;
- private FileListStreamer fileListStreamer;
- private String nextElement;
- private boolean noMoreElement;
+ private final Path backingFile;
+ private String nextElement = null;
private HiveConf conf;
+ private volatile boolean retryMode;
private BufferedReader backingFileReader;
+ private volatile FSDataOutputStream backingFileWriter;
-
- public FileList(Path backingFile, int cacheSize, HiveConf conf) {
+ public FileList(Path backingFile, HiveConf conf) {
this.backingFile = backingFile;
this.conf = conf;
- if (cacheSize > 0) {
- // Cache size must be > 0 for this list to be used for the write
operation.
- this.cache = new LinkedBlockingQueue<>(cacheSize);
- fileListStreamer = new FileListStreamer(cache, backingFile, conf);
- thresholdPoint = getThreshold(cacheSize);
- LOG.debug("File list backed by {} can be used for write operation.",
backingFile);
- } else {
- thresholdHit = true;
+ this.retryMode = false;
+ }
+
+ public void add(String entry) throws IOException {
+ Retryable retryable = buildRetryable();
+ try {
+ retryable.executeCallable((Callable<Void>) ()-> {
+ synchronized (backingFile) {
+ try{
+ if (backingFileWriter == null) {
+ backingFileWriter = initWriter();
+ }
+ backingFileWriter.writeBytes(getEntryWithNewline(entry));
+ backingFileWriter.hflush();
+ LOG.info("Writing entry {} to file list backed by {}", entry,
backingFile);
+ } catch (IOException e) {
+ LOG.error("Writing entry {} to file list {} failed, attempting
retry.", entry, backingFile, e);
+ this.retryMode = true;
+ close();
+ throw e;
+ }
+ }
+ return null;
+ });
+ } catch (Exception e) {
+ throw new
IOException(ErrorMsg.REPL_RETRY_EXHAUSTED.format(e.getMessage()));
}
}
- @VisibleForTesting
- FileList(Path backingFile, FileListStreamer fileListStreamer,
LinkedBlockingQueue<String> cache, HiveConf conf) {
- this.backingFile = backingFile;
- this.fileListStreamer = fileListStreamer;
- this.cache = cache;
- this.conf = conf;
- thresholdPoint = getThreshold(cache.remainingCapacity());
+ Retryable buildRetryable() {
+ return Retryable.builder()
+ .withHiveConf(conf)
+ .withRetryOnException(IOException.class).build();
}
- /**
- * Only add operation is safe for concurrent operations.
- */
- public void add(String entry) throws SemanticException {
- if (thresholdHit && !fileListStreamer.isAlive()) {
- throw new SemanticException("List is not getting saved anymore to file "
+ backingFile.toString());
+ // Return the entry ensuring it ends with newline.
+ private String getEntryWithNewline(String entry) {
+ return new StringWriter()
+ .append(entry)
+ .append(System.lineSeparator())
+ .toString();
+ }
+
+ FSDataOutputStream initWriter() throws IOException {
+ if(shouldAppend()) {
+ return getWriterAppendMode(); // append in retry-mode if file has been
created already
+ }
+ else {
+ return getWriterCreateMode();
}
+ }
+
+ boolean shouldAppend() throws IOException {
+ return backingFile.getFileSystem(conf).exists(backingFile) &&
this.retryMode;
Review comment:
makes sense.
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Issue Time Tracking
-------------------
Worklog Id: (was: 555763)
Time Spent: 3h 40m (was: 3.5h)
> Moving to file based iteration for copying data
> -----------------------------------------------
>
> Key: HIVE-24718
> URL: https://issues.apache.org/jira/browse/HIVE-24718
> Project: Hive
> Issue Type: Bug
> Reporter: Arko Sharma
> Assignee: Arko Sharma
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-24718.01.patch, HIVE-24718.02.patch,
> HIVE-24718.04.patch
>
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
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