incubator-kudu git commit: Weekly update for week ending March 20

[mp...@apache.org]

Repository: incubator-kudu
Updated Branches:
  refs/heads/gh-pages 32ce8d91d -> e4901ebd1


Weekly update for week ending March 20

Change-Id: Ie3ff1a7cfbaed41d224ed46d21d9a49cf6d17624
Reviewed-on: http://gerrit.cloudera.org:8080/2589
Reviewed-by: Mike Percy <mp...@apache.org>
Tested-by: Mike Percy <mp...@apache.org>


Project: http://git-wip-us.apache.org/repos/asf/incubator-kudu/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-kudu/commit/e4901ebd
Tree: http://git-wip-us.apache.org/repos/asf/incubator-kudu/tree/e4901ebd
Diff: http://git-wip-us.apache.org/repos/asf/incubator-kudu/diff/e4901ebd

Branch: refs/heads/gh-pages
Commit: e4901ebd111d01bea3c2fe04e1ade6adee96ad7c
Parents: 32ce8d9
Author: Todd Lipcon <to...@cloudera.com>
Authored: Sun Mar 20 20:30:27 2016 -0700
Committer: Mike Percy <mp...@apache.org>
Committed: Mon Mar 21 16:48:30 2016 +0000

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http://git-wip-us.apache.org/repos/asf/incubator-kudu/blob/e4901ebd/_posts/2016-03-20-weekly-update.md
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+---
+layout: post
+title: Apache Kudu (incubating) Weekly Update March 21, 2016
+author: Todd Lipcon
+---
+Kudu is a fast-moving young open source project, and we've heard from a few
+members of the community that it can be difficult to keep track of what's
+going on day-to-day. A typical month comprises 80-100 individual patches
+committed and hundreds of code review and discussion
+emails. So, inspired by similar weekly newsletters like
+[LLVM Weekly](http://llvmweekly.org/) and [LWN's weekly kernel coverage](http://lwn.net/Kernel/)
+we're going to experiment with our own weekly newsletter covering
+recent development and Kudu-related news.
+<!--more-->
+
+If you find this post useful, please let us know by emailing the
+[kudu-user mailing list](mailto:user@kudu.incubator.apache.org) or
+tweeting at [@ApacheKudu](https://twitter.com/). Similarly, if you're
+aware of some Kudu news we missed, let us know so we can cover it in
+a future post.
+
+## News and articles from around the web
+
+* Apache Kudu (incubating) 0.7.1 was released last week, and this week
+Cloudera announced that its
+[Kudu 0.7.1 binaries](http://www.cloudera.com/documentation/betas/kudu/latest/topics/kudu_installation.html)
+are now available.
+* The Ibis open source project [released version 0.7.0](http://blog.ibis-project.org/release-0.7/)
+which includes support for querying Kudu. [An earlier post](http://blog.ibis-project.org/kudu-impala-ibis/)
+shows an example of the Ibis-Kudu integration in action.
+
+## Development discussions and code in progress
+
+* Since the first public release, Kudu has had some experimental support for high-availability
+master processes. Adar Dembo has started some work identifying the current gaps that make it
+experimental and outlining some plans to stabilize it enough for reliable production use.
+This week he posted a [design doc](http://gerrit.cloudera.org:8080/#/c/2527/) as well as
+some [analysis of CatalogManager code paths](http://gerrit.cloudera.org:8080/#/c/2583/).
+
+* David Alves kicked off a [discussion about version numbers for the Python client](http://markmail.org/message/p4njqwkls7di7aoa).
+The discussion trailed off with some general agreement that the Python client would
+keep to its own version numbering scheme for the time being, rather than being tied
+to specific Kudu versions.
+
+* Binglin Chang's patch for [per-tablet write quotas](http://gerrit.cloudera.org:8080/#/c/2327/)
+and associated throttling passed review and should be committed soon. This adds a very basic
+throttling mechanism that can provide for some basic isolation and capacity planning for
+multi-tenant clusters. It will be considered an experimental feature in the 0.8.0 release.
+
+* Dan Burkert finished off some patches originally prototyped by Todd Lipcon which add
+two types of "feature flags" for Kudu's RPC system. Feature flags are a mechanism by which
+Kudu clients and servers can expose to one another what specific features they support,
+enabling better cross-version compatibility. The [first type of feature flag](http://gerrit.cloudera.org:8080/#/c/2238/)
+enumerates the features supported by the RPC system itself. The [second type](http://gerrit.cloudera.org:8080/#/c/2239/)
+are scoped to an individual call, and can be used by a client to assert that the server
+is new enough to properly interpret requests. The commit messages and code documentation
+included in these patches give example use cases.
+
+* Dan also finished off most of a patch series implementing improved partition pruning
+support. This will help reduce the number of servers that a client must contact when
+scanning a table with predicates (e.g. by eliminating tablets from a hash-partitioned
+table when the scanner specifies an equality predicate on the hash-distributed column).
+More details can be found in the
+[partition-pruning design doc](https://github.com/apache/incubator-kudu/blob/master/docs/design-docs/scan-optimization-partition-pruning.md)
+as well as the patches ([1](http://gerrit.cloudera.org:8080/#/c/2137/),
+[2](http://gerrit.cloudera.org:8080/#/c/2413/),
+[3](http://gerrit.cloudera.org:8080/#/c/2138/)).
+
+## Upcoming talks and meetups
+
+* Dan Burkert will be presenting his work on a
+[Rust language client library for Kudu](https://github.com/danburkert/kudu-rs)
+at the [Rust Bay Area](http://www.meetup.com/Rust-Bay-Area/events/229107276/) meetup.