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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2314) Make Streaming File Sources Persistent
Date Mon, 23 May 2016 13:08:12 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15296341#comment-15296341
] 

ASF GitHub Bot commented on FLINK-2314:
---------------------------------------

GitHub user kl0u opened a pull request:

    https://github.com/apache/flink/pull/2020

    [FLINK-2314] Make Streaming File Sources Persistent

    This PR solves FLINK-2314 and combines a number of sub-tasks. In addition, it solves FLINK-3896
which was introduced as part of this task.
    
    The way File Input sources are now processed is the following:
         * One task monitors (parallelism 1) a user-specified path for new files/data
         * The above task assigns FileInputSplits to downstream (parallel) readers to actually
read the data
    
    The monitoring entity scans the path, splits the files to be processed in splits, and
assigns them downstream. For now, two modes are supported. These are the PROCESS_ONCE which
just processes the current contents of the path and exits, and the REPROCESS_WITH_APPENDED
which periodically monitors the path and reprocesses new files and (the entire contents of)
files with new data.
    
    In addition, these sources are checkpointed, i.e. in the case of a task failure the job
will resume from where it left off.
    
    Finally, some changes were introduced in the way we are handling FileInputFormats after
discussions with @aljoscha .

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

    $ git pull https://github.com/kl0u/flink api_ft_files

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

    https://github.com/apache/flink/pull/2020.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 #2020
    
----
commit 0d378f85ef7beec598701d78e0537f7479be99d9
Author: kl0u <kkloudas@gmail.com>
Date:   2016-05-10T16:56:58Z

    [FLINK-3896] Allow a StreamTask to be Externally Cancelled
    
    It adds a method failExternally() to the StreamTask, so that custom Operators
    can make their containing task fail when needed.

commit 1a06e70d4cc72593663ed5065e9c68c5b9fadac1
Author: kl0u <kkloudas@gmail.com>
Date:   2016-04-10T14:56:42Z

    [FLINK-3717] Make FileInputFormat checkpointable
    
    This adds a new interface called CheckpointableInputFormat
    which describes input formats whose state is queryable,
    i.e. getCurrentChannelState() returns where the reader is
    in the underlying source, and they can resume reading from
    a user-specified position.
    
    This functionality is not yet leveraged by current readers.

commit 13db59ff214c6c1790b73e8b06984a7170924c5a
Author: kl0u <kkloudas@gmail.com>
Date:   2016-04-18T14:37:54Z

    [FLINK-3889] Refactor File Monitoring Source
    
    This is meant to replace the different file
    reading sources in Flink streaming. Now there is
    one monitoring source with DOP 1 monitoring a
    directory and assigning input split to downstream
    readers.
    
    In addition, it makes the new features added by
    FLINK-3717 work together with the aforementioned entities
    (the monitor and the readers) in order to have
    fault tolerant file sources and exactly once guarantees.
    
    This does not replace the old API calls. This
    will be done in a future commit.

commit 0c8e852b96752a716c36452f7ced11c79cca5560
Author: kl0u <kkloudas@gmail.com>
Date:   2016-05-18T14:44:45Z

    [FLINK-2314] Make Streaming File Sources Persistent

----


> Make Streaming File Sources Persistent
> --------------------------------------
>
>                 Key: FLINK-2314
>                 URL: https://issues.apache.org/jira/browse/FLINK-2314
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>    Affects Versions: 0.9
>            Reporter: Stephan Ewen
>            Assignee: Kostas Kloudas
>
> Streaming File sources should participate in the checkpointing. They should track the
bytes they read from the file and checkpoint it.
> One can look at the sequence generating source function for an example of a checkpointed
source.



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