GitHub user eyalfa opened a pull request:

    [Spark 3151][Block Manager] DiskStore.getBytes fails for files larger than 

    ## What changes were proposed in this pull request?
    introduced `DiskBlockData`, a new implementation of `BlockData` 
representing a whole file.
    this is somehow related to 
[SPARK-6236]( as well
    This class follows the implementation of `EncryptedBlockData` just without 
the encryption. hence:
    * it uses FileOutputStream (todo: encrypted version actually uses 
`Channels.newInputStream`, not sure if it's the right choice for this)
    * `toNetty` is implemented in terms of 
    * `toByteBuffer` fails for files larger than 2GB (same behavior of the 
original code, just postponed a bit), it also respects the same configuration 
keys defined by the original code to choose between memory mapping and simple 
file read.
    (Please fill in changes proposed in this fix)
    ## How was this patch tested?
    added test to DiskStoreSuite and MemoryManagerSuite

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

    $ git pull SPARK-3151

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

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

    This closes #18855
commit fc3f1d78e14a30dd2f71fc65ec59a2def5c1a0d4
Author: Eyal Farago <>
Date:   2017-07-05T13:20:16Z

    SPARK-6235__take1: introduce a failing test.

commit 84687380026a6a3bcded27be517094d3f690c3bb
Author: Eyal Farago <>
Date:   2017-07-30T20:06:05Z

    SPARK-6235__add_failing_tests: add failing tests for block manager suite.

commit 15804497a477b8f97c08adfad5f0519504dc82f2
Author: Eyal Farago <>
Date:   2017-08-01T17:34:26Z

    SPARK-6235__add_failing_tests: introduce a new BlockData implementation to 
represent a disk backed block data.

commit c5028f50698c4fe48a06f5dd683dbee42f7e6b2b
Author: Eyal Farago <>
Date:   2017-08-05T19:57:41Z

    SPARK-6235__add_failing_tests: styling

commit 908c7860688534d0bb77bcbebbd2e006a161fb74
Author: Eyal Farago <>
Date:   2017-08-05T19:58:52Z

    SPARK-6235__add_failing_tests: adapt DiskStoreSuite to the modifications in 
the tested class.

commit 67f4259ca16c3ca7c904c9ccc5de9acbc25d2271
Author: Eyal Farago <>
Date:   2017-08-05T20:57:58Z

    SPARK-6235__add_failing_tests: try to reduce actual memory footprint of the 
>2gb tests.


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