GitHub user StefanRRichter opened a pull request:
https://github.com/apache/flink/pull/2781
[FLINK-5041] Savepoint backwards compatibility 1.1 -> 1.2
This PR implements sub-issues [FLINK-5042] and [FLINK-5043] of [FLINK-5041].
[FLINK-5042] : Backwards compatibility for savepoints is implemented by
reintroducing some older classes from 1.1 that have been
removed/replaced/changed in 1.2. All such classes are moved to a different
packet prefixed as `org.apache.flink.migration`, while their class names remain
unchanged. With `MigrationInstantiationUtil` a special deserialization facility
is provided that allows to load Java serialized objects of classes from 1.1.
The idea is to redirect their fully qualified classname to their new location
in `org.apache.flink.migration`. This is done through a modified
`ObjectInputStream`. All state meta structures and handles are then converted
to 1.2.
[FLINK-5043] : Introduced code in the keyed state backends ensures
backwards compatibility by translating states from the old backends based on
Heap, Filesystem, and RocksDB.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/StefanRRichter/flink
savepoint-backwards-compatibility
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2781.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 #2781
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commit a86f96df3c0be6e786246a6bbf814607fe7e0f47
Author: Stefan Richter <s.rich...@data-artisans.com>
Date: 2016-11-01T11:29:01Z
Backwards compatibility 1.1 -> 1.2
commit 49bc1fc10a47707d38f73fa9aa414f617439aef2
Author: Stefan Richter <s.rich...@data-artisans.com>
Date: 2016-11-09T13:54:35Z
Removing some unecessary code from migration classes
commit 9c578a37b11b5f70b92921d3562dd17ca9ed7493
Author: Stefan Richter <s.rich...@data-artisans.com>
Date: 2016-11-09T17:21:13Z
MultiStreamStateHandle
commit 2791cbbfaeb828f99d1be6e7d460f17520389066
Author: Stefan Richter <s.rich...@data-artisans.com>
Date: 2016-11-10T13:18:55Z
Added migration unit test
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