"java.io.IOException: Could not create FileClient"
If you see this error in the jobtracker logs for a failed job, you are most likely looking at an irrelevant error. To be clearer, your job failed before this point and was subsequently killed by the jobtracker. Some processes that linger in memory after the job was killed keeps attempting to access some of the resources assigned to them and this continues till they time out and eventually get killed. The resources, for eg. the file or parent directory etc. would have been removed as part of killing the job by the job tracker, hence the stray process would not be able to create any new files.
If you see this error in the jobtracker logs for a failed job, you are most likely looking at an irrelevant error. To be clearer, your job failed before this point and was subsequently killed by the jobtracker. Some processes that linger in memory after the job was killed keeps attempting to access some of the resources assigned to them and this continues till they time out and eventually get killed. The resources, for eg. the file or parent directory etc. would have been removed as part of killing the job by the job tracker, hence the stray process would not be able to create any new files.
