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From Junping Du <...@hortonworks.com>
Subject Re: Apache Hadoop 2.8.3 Release Plan
Date Wed, 22 Nov 2017 22:51:09 GMT
Thanks Konstantin and Weiwei for calling attention. These two HDFS issues looks to be important
to be fixed which are on my radar now.

I will hold on RC cut until we figure them out.


Thanks,


Junping


________________________________
From: Weiwei Yang <cheersyang@hotmail.com>
Sent: Tuesday, November 21, 2017 7:45 PM
To: Junping Du; Konstantin Shvachko
Cc: Wangda Tan; Andrew Wang; Zheng, Kai; common-dev@hadoop.apache.org; hdfs-dev@hadoop.apache.org;
mapreduce-dev@hadoop.apache.org; yarn-dev@hadoop.apache.org
Subject: Re: Apache Hadoop 2.8.3 Release Plan

Agree with Konstantin. This two issues has been opened for a while but could not reach a consensus
on the fix, hope this gets enough attention from the community and get them resolved.

Thanks

--
Weiwei

On 22 Nov 2017, 11:18 AM +0800, Konstantin Shvachko <shv.hadoop@gmail.com>, wrote:
I would consider these two blockers for 2.8.3 as they crash NN:

https://issues.apache.org/jira/browse/HDFS-12638
https://issues.apache.org/jira/browse/HDFS-12832

Thanks,
--Konstantin

On Tue, Nov 21, 2017 at 11:16 AM, Junping Du <jdu@hortonworks.com> wrote:

Thanks Andrew and Wangda for comments!

To me, an improvement with 17 patches is not a big problem as this is
self-contained and I didn't see a single line of delete/update on existing
code - well, arguably, patches with only adding code can also have big
impact but not likely the case here.

While the dependency discussions on HADOOP-14964 are still going on, I
will leave the decision to JIRA discussion based on which approach we will
choose(shaded?) and impact. If we cannot make consensus in short term,
probably we have to miss this in 2.8.3 release.


Okay. Last call for blocker/critical fixes landing on branch-2.8.3. RC0
will get cut-off shortly.



Thanks,


Junping


________________________________
From: Wangda Tan <wheeleast@gmail.com
Sent: Tuesday, November 21, 2017 10:52 AM
To: Andrew Wang
Cc: Junping Du; Zheng, Kai; common-dev@hadoop.apache.org;
hdfs-dev@hadoop.apache.org; mapreduce-dev@hadoop.apache.org;
yarn-dev@hadoop.apache.org
Subject: Re: Apache Hadoop 2.8.3 Release Plan

Thanks Junping for driving this.

For the bug fix vs. improvement, it is actually very hard to define,
improvement could be self-contained and useful, bug fix could be dangerous
in some cases. To me, If an improvement fixed some existing use case, and
the fix is self-contained. I will be open to bring such fix to maintenance
release. For example, in 2.8.2, we back ported CapacityScheduler intra
queue preemption https://issues.apache.org/jira/browse/YARN-2113. It is a
big change in terms of patch size, but since it fixes broken use case
(balance user usage under Capacity Scheduler leaf queue), we backported it
to 2.8.2 after thorough tests and validations by Yahoo.

I'm not quite familiar with HADOOP-14964, I will leave the decision to
committers who know more about the field.

Just my 2 cents.

Regards,
Wangda


On Tue, Nov 21, 2017 at 10:21 AM, Andrew Wang <andrew.wang@cloudera.com<
mailto:andrew.wang@cloudera.com>> wrote:
The Aliyun OSS code isn't a small improvement. If you look at Sammi's
comment
<https://issues.apache.org/jira/browse/HADOOP-14964?
focusedCommentId=16247085&page=com.atlassian.jira.
plugin.system.issuetabpanels:comment-tabpanel#comment-16247085>,
it's
a 17 patch series that is being backported in one shot. What we're talking
about is equivalent to merging a feature branch in a maintenance release. I
see that Kai and Chris are having a discussion about the dependency
changes, which indicates this is not a zero-risk change either. We really
should not be changing dependency versions in a maintenance unless it's
because of a bug.

It's unfortunate from a timing perspective that this missed 2.9.0, but I
still think it should wait for the next minor. Merging a feature into a
maintenance release sets the wrong precedent.

Best,
Andrew

On Tue, Nov 21, 2017 at 1:08 AM, Junping Du <jdu@hortonworks.com<mailto:jd
u@hortonworks.com>> wrote:

Thanks Kai for calling out this feature/improvement for attention and
Andrew for comments.


While I agree that maintenance release should focus on important bug fix
only, I doubt we have strict rules to disallow any features/improvements
to
land on maint release especially when those are small footprint or low
impact on existing code/features. In practice, we indeed has 77 new
features/improvements in latest 2.7.3 and 2.7.4 release.


Back to HADOOP-14964, I did a quick check and it looks like case here
belongs to self-contained improvement that has very low impact on
existing
code base, so I am OK with the improvement get landed on branch-2.8 in
case
it is well reviewed and tested.


However, as RM of branch-2.8, I have two concerns to accept it in our
2.8.3 release:

1. Timing - as I mentioned in beginning, the main purpose of 2.8.3 are
for
several critical bug fixes and we should target to release it very soon -
my current plan is to cut RC out within this week inline with waiting
for 3.0.0 vote closing. Can this improvement be well tested against
branch-2.8.3 within this strictly timeline? It seems a bit rush unless we
have strong commitment on test plan and activities in such a tight time.


2. Upgrading - I haven't heard we settle down the plan of releasing this
feature in 2.9.1 release - though I saw some discussions are going on
at HADOOP-14964. Assume 2.8.3 is released ahead of 2.9.1 and it includes
this improvement, then users consuming this feature/improvement have no
2.9
release to upgrade or forcefully upgrade with regression. We may need a
better upgrade story here.


Pls let me know what you think. Thanks!



Thanks,


Junping


------------------------------
*From:* Andrew Wang <andrew.wang@cloudera.com<mailto:
andrew.wang@cloudera.com
*Sent:* Monday, November 20, 2017 10:22 PM
*To:* Zheng, Kai
*Cc:* Junping Du; common-dev@hadoop.apache.org<mailto:common-dev@hadoop.
apache.org>; hdfs-dev@hadoop.apache.org<mailto:hdfs-dev@hadoop.apache.org
;
mapreduce-dev@hadoop.apache.org<mailto:mapreduce-dev@hadoop.apache.org>;
yarn-dev@hadoop.apache.org<mailto:yarn-dev@hadoop.apache.org
*Subject:* Re: Apache Hadoop 2.8.3 Release Plan

I'm against including new features in maintenance releases, since they're
meant to be bug-fix only.

If we're struggling with being able to deliver new features in a safe and
timely fashion, let's try to address that, not overload the meaning of
"maintenance release".

Best,
Andrew

On Mon, Nov 20, 2017 at 5:20 PM, Zheng, Kai <kai.zheng@intel.com<mailto:
kai.zheng@intel.com>> wrote:

Hi Junping,

Thank you for making 2.8.2 happen and now planning the 2.8.3 release.

I have an ask, is it convenient to include the back port work for OSS
connector module? We have some Hadoop users that wish to have it by
default
for convenience, though in the past they used it by back porting
themselves. I have raised this and got thoughts from Chris and Steve.
Looks
like this is more wanted for 2.9 but I wanted to ask again here for
broad
feedback and thoughts by this chance. The back port patch is available
for
2.8 and the one for branch-2 was already in. IMO, 2.8.x is promising as
we
can see some shift from 2.7.x, hence it's worth more important features
and
efforts. How would you think? Thanks!

https://issues.apache.org/jira/browse/HADOOP-14964

Regards,
Kai

-----Original Message-----
From: Junping Du [mailto:jdu@hortonworks.com<mailto:jdu@hortonworks.com
]
Sent: Tuesday, November 14, 2017 9:02 AM
To: common-dev@hadoop.apache.org<mailto:common-dev@hadoop.apache.org>;
hdfs-dev@hadoop.apache.org<mailto:hdfs-dev@hadoop.apache.org>;
mapreduce-dev@hadoop.apache.org<mailto:mapreduce-dev@hadoop.apache.org>;
yarn-dev@hadoop.apache.org<mailto:yarn-dev@hadoop.apache.org
Subject: Apache Hadoop 2.8.3 Release Plan

Hi,
We have several important fixes get landed on branch-2.8 and I would
like to cut off branch-2.8.3 now to start 2.8.3 release work.
So far, I don't see any pending blockers on 2.8.3, so my current
plan
is to cut off 1st RC of 2.8.3 in next several days:
- For all coming commits to land on branch-2.8, please mark
the
fix version as 2.8.4.
- If there is a really important fix for 2.8.3 and getting
closed, please notify me ahead before landing it on branch-2.8.3.
Please let me know if you have any thoughts or comments on the plan.

Thanks,

Junping
________________________________________
From: dujunping@gmail.com<mailto:dujunping@gmail.com> <
dujunping@gmail.com<mailto:dujunping@gmail.com>> on behalf of ??? <
junping_du@apache.org<mailto:junping_du@apache.org
Sent: Friday, October 27, 2017 3:33 PM
To: general@hadoop.apache.org<mailto:general@hadoop.apache.org
Subject: [ANNOUNCE] Apache Hadoop 2.8.2 Release.

Hi all,

It gives me great pleasure to announce that the Apache Hadoop
community has voted to release Apache Hadoop 2.8.2, which is now
available
for download from Apache mirrors[1]. For download instructions please
refer
to the Apache Hadoop Release page [2].

Apache Hadoop 2.8.2 is the first GA release of Apache Hadoop 2.8 line
and
our newest stable release for entire Apache Hadoop project. For major
changes incuded in Hadoop 2.8 line, please refer Hadoop 2.8.2 main
page[3].

This release has 315 resolved issues since previous 2.8.1 release with
following
breakdown:
- 91 in Hadoop Common
- 99 in HDFS
- 105 in YARN
- 20 in MapReduce
Please read the log of CHANGES[4] and RELEASENOTES[5] for more details.

The release news is posted on the Hadoop website too, you can go to the
downloads section directly [6].

Thank you all for contributing to the Apache Hadoop release!


Cheers,

Junping


[1] http://www.apache.org/dyn/closer.cgi/hadoop/common

[2] http://hadoop.apache.org/releases.html

[3] http://hadoop.apache.org/docs/r2.8.2/index.html

[4]
http://hadoop.apache.org/docs/r2.8.2/hadoop-project-dist/had
oop-common/release/2.8.2/CHANGES.2.8.2.html

[5]
http://hadoop.apache.org/docs/r2.8.2/hadoop-project-dist/had
oop-common/release/2.8.2/RELEASENOTES.2.8.2.html

[6] http://hadoop.apache.org/releases.html#Download


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