mukund-thakur commented on a change in pull request #1404: HDFS-13660 Copy file
till the source file length during distcp
URL: https://github.com/apache/hadoop/pull/1404#discussion_r323663047
##########
File path:
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/mapred/TestCopyMapper.java
##########
@@ -444,6 +449,54 @@ private void testCopyingExistingFiles(FileSystem fs,
CopyMapper copyMapper,
}
}
+ @Test
+ public void testCopyWhileAppend() throws Exception {
+ deleteState();
+ mkdirs(SOURCE_PATH + "/1");
+ touchFile(SOURCE_PATH + "/1/3");
+ CopyMapper copyMapper = new CopyMapper();
+ StubContext stubContext = new StubContext(getConfiguration(), null, 0);
+ Mapper<Text, CopyListingFileStatus, Text, Text>.Context context =
+ stubContext.getContext();
+ copyMapper.setup(context);
+ final Path path = new Path(SOURCE_PATH + "/1/3");
+ int manyBytes = 100000000;
+ appendFile(path, manyBytes);
+ ScheduledExecutorService scheduledExecutorService =
Executors.newSingleThreadScheduledExecutor();
+ Runnable task = new Runnable() {
+ public void run() {
+ try {
+ int maxAppendAttempts = 20;
+ int appendCount = 0;
+ while (appendCount < maxAppendAttempts) {
+ appendFile(path, 1000);
+ Thread.sleep(200);
+ appendCount++;
+ }
+ } catch (IOException | InterruptedException e) {
+ e.printStackTrace();
+ }
+ }
+ };
+ scheduledExecutorService.schedule(task, 10, TimeUnit.MILLISECONDS);
+ boolean isFileMismatchErrorPresent = false;
+ try {
+ copyMapper.map(new Text(DistCpUtils.getRelativePath(new
Path(SOURCE_PATH), path)),
+ new CopyListingFileStatus(cluster.getFileSystem().getFileStatus(
+ path)), context);
+ } catch (Exception ex) {
+ StringWriter sw = new StringWriter();
+ ex.printStackTrace(new PrintWriter(sw));
Review comment:
ex.printStackTrace(new PrintWriter(sw)); is used to capture the complete
stacktrace in a string as the message we want to match is a part of nested
stack trace.
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