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From Thejas Nair <>
Subject Re: [DISCUSS] Re: deprecating MR in the first release of Hive 2.0
Date Fri, 30 Oct 2015 19:19:57 GMT
the jira -

On Mon, Oct 26, 2015 at 2:58 PM, Sergey Shelukhin
<> wrote:
> There appear to be no objections, so I will start by filing a JIRA :)
> On 15/10/22, 14:38, "Thejas Nair" <> wrote:
>>(Adding [DISCUSS] to subject to bring it to attention of wider audience.)
>>+1 Given how much investment is going into Tez and Spark execution
>>modes, it makes sense to convey that better to the user community and
>>recommend the use of the new modes over MR. Users who choose those
>>modes are going to get better experience, and it will help to improve
>>the overall perception of Hive.
>>Once most users have moved to the new modes, we can start looking into
>>removing MR support. (Though that is likely to take a while).
>>On Wed, Oct 21, 2015 at 9:44 PM, Sergey Shelukhin
>><> wrote:
>>> We have discussed the removal of hadoop-1 and MR support in Hive 2 line
>>>in the past..
>>> Hadoop-1 removal seems to be non-controversial and on track; before we
>>>cut the first release of Hive 2, I propose we deprecate MR.
>>> Tez and Spark engines provide vast perf improvements over MR;
>>> Execution optimization work by most contributors for a long time has
>>>been done for these engines and is not portable to MR, so it is
>>>languishing further;
>>> At the same time, supporting additional code has other development
>>>costs for new features or bugs, plus we have to run tests for it both in
>>>Apache and for local changes and to deploy code.
>>> However, MR is hard to remove. Plus, it may provide a baseline for some
>>>bugs in other engines (which is not bulletproof since MR logic can be
>>>incorrect), or to mock during perf benchmarks.
>>> Therefore, I propose that for now we add deprecation warnings
>>>suggesting the other alternatives:
>>>   *   to Hive configuration documentation.
>>>   *   to Hive wiki.
>>>   *   to release notes on Hive 2.
>>>   *   in Beeline and CLI when using MR.
>>> Additionally, I propose we remove Minimr test driver from HiveQA runs
>>>for master.
>>> What do you think?

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