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From sihuazhou <...@git.apache.org>
Subject [GitHub] flink pull request #6020: [FLINK-9373][state] Always call RocksIterator.stat...
Date Wed, 16 May 2018 07:51:11 GMT
GitHub user sihuazhou opened a pull request:

    https://github.com/apache/flink/pull/6020

    [FLINK-9373][state] Always call RocksIterator.status() to check the internal error of
RocksDB

    ## What is the purpose of the change
    
    Currently, when using RocksIterator we only use the `iterator.isValid()` to check whether
we have reached the end of the iterator. But that is not enough, if we refer to RocksDB's
wiki https://github.com/facebook/rocksdb/wiki/Iterator#error-handling we should find that
even if `iterator.isValid()=true`, there may also exist some internal errors. A safer way
to use the `RocksIterator` is to always call the `iterator.status()` to check the internal
error of RocksDB. There is one case from user email seems to lost data because of this http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Missing-MapState-when-Timer-fires-after-restored-state-td20134.html
(I'm not so sure yet)
    
    ## Brief change log
    
      - *Always call RocksIterator.status() to check the internal error of RocksDB*
    
    
    ## Verifying this change
    
    This change is a trivial rework / code cleanup without any test coverage.
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): (no)
      - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
      - The serializers: (no)
      - The runtime per-record code paths (performance sensitive): (no)
      - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, ZooKeeper: (no)
      - The S3 file system connector: (no)
    
    ## Documentation
    
      - Does this pull request introduce a new feature? (no)


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/sihuazhou/flink FLINK-9373

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/6020.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #6020
    
----
commit b1d531949d521bb7d72cd389dfe72a4a5cf1bfc9
Author: sihuazhou <summerleafs@...>
Date:   2018-05-16T07:47:05Z

    Always call RocksIterator.status() to check the internal error of RocksDB

----


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