GitHub user ramkrish86 opened a pull request:

    https://github.com/apache/flink/pull/2510

    FLINK-3322 Allow drivers and iterators to reuse the memory segments

    Thanks for contributing to Apache Flink. Before you open your pull request, 
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    Updated PR based on @ggevay 's feedback. Now the drivers are all made of 
type ResettableDrivers and we use the existing APIs to reuse the driver and the 
iterators. The JoinTaskITerator has now a new method called reset() that allows 
to reset the iterator's state.
    If we go with the approach then it makes sense to remove the 
ResettableDriver and add all the API in it to the Driver interface itself. That 
is for a later PR. 
    @ggevay - Pls review and give your valuable feedback.
    I tried mvn clean verify and got the tests to pass in flink-runtime and 
flink-gelly-examples. One failed 
'org.apache.flink.runtime.io.disk.ChannelViewsTest.testWriteAndReadLongRecords' 
and when I ran locally it passed again. 


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

    $ git pull https://github.com/ramkrish86/flink FLINK-4615_new

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

    https://github.com/apache/flink/pull/2510.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 #2510
    
----
commit e17462881cc2f0137cc8412eb578fb4c42baeb15
Author: Ramkrishna <ramkrishna.s.vasude...@intel.com>
Date:   2016-09-19T10:27:28Z

    FLINK-3322 Allow drivers and iterators to reuse the memory segments

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