nlu90 opened a new pull request #2883: check checkpoint file exists before deleting it URL: https://github.com/apache/incubator-heron/pull/2883 Currently, if there's no checkpoint file under the root dir, the LocalFileSystemStorage will raise an NPE directly and cause the process to stop when handling the clean checkpoint request. This PR avoids the NPE and log a warning if there're no files to be deleted under the root directory.
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