Github user HuangWHWHW commented on a diff in the pull request:
https://github.com/apache/flink/pull/1098#discussion_r39237069
--- Diff:
flink-staging/flink-streaming/flink-streaming-scala/src/test/java/org/apache/flink/streaming/scala/api/CsvOutputFormatITCase.java
---
@@ -36,6 +37,10 @@ protected void preSubmit() throws Exception {
@Override
protected void testProgram() throws Exception {
OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT,
resultPath);
+ OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT,
resultPath, 1);
--- End diff --
The `writeMode` by setting default is already exist.
It will check whether the file can be overwrite or not in
`FileOutputFormat.java`:
`private static final void initDefaultsFromConfiguration(Configuration
configuration) {
final boolean overwrite =
configuration.getBoolean(ConfigConstants
.FILESYSTEM_DEFAULT_OVERWRITE_KEY,
ConfigConstants.DEFAULT_FILESYSTEM_OVERWRITE);
DEFAULT_WRITE_MODE = overwrite ? WriteMode.OVERWRITE :
WriteMode.NO_OVERWRITE;
final boolean alwaysCreateDirectory =
configuration.getBoolean(ConfigConstants
.FILESYSTEM_OUTPUT_ALWAYS_CREATE_DIRECTORY_KEY,
ConfigConstants.DEFAULT_FILESYSTEM_ALWAYS_CREATE_DIRECTORY);
DEFAULT_OUTPUT_DIRECTORY_MODE = alwaysCreateDirectory ?
OutputDirectoryMode.ALWAYS : OutputDirectoryMode.PARONLY;
}`
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