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[jira] [Created] (FLINK-10522) Check if RecoverableWriter supportsResume and accordingly.

Kostas Kloudas created FLINK-10522:

             Summary: Check if RecoverableWriter supportsResume and accordingly.
                 Key: FLINK-10522
                 URL: https://issues.apache.org/jira/browse/FLINK-10522
             Project: Flink
          Issue Type: Sub-task
          Components: filesystem-connector
    Affects Versions: 1.6.0
            Reporter: Kostas Kloudas
            Assignee: Kostas Kloudas
             Fix For: 1.7.0

So far we assumed that all `RecoverableWriters` support "resuming", i.e. after recovering from a failure or from a savepoint they could keep writing to the previously "in-progress" file. This assumption holds for all current writers, but in order to be able to accommodate also filesystems that may not support this operation, we should check upon initialization if the writer supports resuming and if yes, we go as before, if not, we recover for commit and commit the previously in-progress file.

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