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From "Stefan Richter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9373) Fix potential data losing for RocksDBBackend
Date Thu, 17 May 2018 10:29:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16478866#comment-16478866
] 

Stefan Richter commented on FLINK-9373:
---------------------------------------

Great, thanks a lot!

> Fix potential data losing for RocksDBBackend
> --------------------------------------------
>
>                 Key: FLINK-9373
>                 URL: https://issues.apache.org/jira/browse/FLINK-9373
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.5.0
>            Reporter: Sihua Zhou
>            Assignee: Sihua Zhou
>            Priority: Blocker
>             Fix For: 1.5.0
>
>
> 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 error. A safer way to
use the _RocksIterator_ is to always call the _iterator.status()_ to check the internal error
of _RocksDB_. There is a 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



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