support to generate unique directory for error.path to avoid the data confuse

[Nicole00]

Introduction

now the error path is configed by user config file. If you run the exchange app over one times without modify error.output, the path will be reused, and the data will append to the file in error path, causing data confuse.

in order to avoid this, we need to generate a unique directory for every spark application to store the writing failed data.

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Related work