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From: jdcryans@apache.org
To: commits@kudu.incubator.apache.org
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Subject: incubator-kudu git commit: Add 4/18 weekly update
Date: Mon, 18 Apr 2016 18:12:03 +0000 (UTC)

Repository: incubator-kudu
Updated Branches:
  refs/heads/gh-pages 86ae98bc4 -> 65ff8b29a


Add 4/18 weekly update

Change-Id: I31a5a5274ec30014566cd35405c087de5441e14e
Reviewed-on: http://gerrit.cloudera.org:8080/2805
Reviewed-by: Jean-Daniel Cryans
Tested-by: Todd Lipcon <todd@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/65ff8b29
Tree: http://git-wip-us.apache.org/repos/asf/incubator-kudu/tree/65ff8b29
Diff: http://git-wip-us.apache.org/repos/asf/incubator-kudu/diff/65ff8b29

Branch: refs/heads/gh-pages
Commit: 65ff8b29ad633ab8a17590eda8413f1e0fa98415
Parents: 86ae98b
Author: Todd Lipcon <todd@cloudera.com>
Authored: Mon Apr 18 09:26:47 2016 -0700
Committer: Todd Lipcon <todd@apache.org>
Committed: Mon Apr 18 16:44:06 2016 +0000

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 _posts/2016-04-18-weekly-update.md | 80 +++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
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http://git-wip-us.apache.org/repos/asf/incubator-kudu/blob/65ff8b29/_posts/2016-04-18-weekly-update.md
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diff --git a/_posts/2016-04-18-weekly-update.md b/_posts/2016-04-18-weekly-update.md
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+---
+layout: post
+title: Apache Kudu (incubating) Weekly Update April 18, 2016
+author: Todd Lipcon
+---
+Welcome to the fifth edition of the Kudu Weekly Update. This weekly blog post
+covers ongoing development and news in the Apache Kudu (incubating) project.
+
+<!--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/ApacheKudu). Similarly, if you're
+aware of some Kudu news we missed, let us know so we can cover it in
+a future post.
+
+## Project news
+
+* Cloudera announced that it has posted [binary packages](http://markmail.org/thread/tghwcux5k4qvcsep)
+  for the recent 0.8.0 release. These are not official packages from
+  the Apache Kudu (incubating) project, but users who prefer not to
+  build from source may find them convenient.
+
+* Jean-Daniel Cryans has volunteered to continue to act as release manager for
+  the 0.x release line, and has start a [discussion](http://mail-archives.apache.org/mod_mbox/incubator-kudu-dev/201604.mbox/%3CCAGpTDNcfTOcp%2Beb39h5j%3DoxttZNhOBZ7v%2B%2B6hxRtWCh3t_psbQ%40mail.gmail.com%3E)
+  detailing what features and improvements he expects will be ready
+  for an 0.9 release in June.
+
+## Development discussions and code in progress
+
+* Chris George posted a [work in progress patch](http://gerrit.cloudera.org:8080/#/c/2754/)
+  for a native Kudu RDD implementation for Spark. Kudu already ships an RDD
+  based on the generic HadoopRDD and Kudu's MapReduce integration, but Chris's
+  new version paves the way for new features like pushing down predicates.
+
+
+* Todd Lipcon has been working on [KUDU-1410](https://issues.apache.org/jira/browse/KUDU-1410),
+  a small project which makes it easier to diagnose performance issues on a Kudu
+  cluster.
+
+  The first feature proposed by this JIRA is the idea of collecting
+  "exemplar" traces: for each type of RPC (e.g. _Write_, _Scan_, etc.)
+  the RPC system will collect a few _exemplar_ RPCs in different
+  latency buckets and retain their traces.  This makes it easier for
+  an operator to see what might have caused a slow response from a
+  server even after the request has been finished for some time.
+
+  The second new feature is the collection of per-RPC-request metrics
+  such as lock acquisition time, time spent waiting on disk, and other
+  metrics specific to each type of RPC. In combination with the
+  exemplar trace feature above, this should make it easy to root-cause
+  whether a request is slow due to underlying hardware issues,
+  Kudu-specific issues, or a particular workload characteristic.
+
+  Todd posted a work-in-progress implementation of these features on gerrit
+  in a five-part patch series:
+  [(1)](http://gerrit.cloudera.org:8080/#/c/2794/)
+  [(2)](http://gerrit.cloudera.org:8080/#/c/2795/)
+  [(3)](http://gerrit.cloudera.org:8080/#/c/2796/)
+  [(4)](http://gerrit.cloudera.org:8080/#/c/2797/)
+  [(5)](http://gerrit.cloudera.org:8080/#/c/2798/)
+
+* Dan Burkert continued working on the [Java implementation of the Scan Token API](http://gerrit.cloudera.org:8080/#/c/2592/)
+  described in previous weekly updates, with reviews this week from Jean-Daniel
+  Cryans and Adar Dembo. He also posted a patch for the [C++ implementation](http://gerrit.cloudera.org:8080/#/c/2757/)
+  which has seen some review action as well.
+
+* Dan also posted a [design document for non-covering range partitioning](http://gerrit.cloudera.org:8080/#/c/2772/).
+  This new feature will allow Kudu operators to add or drop tablets to
+  an existing range-partitioned table. This is very important for time
+  series use cases where new partitions may need to be added daily,
+  and old partitions potentially dropped in order to achieve a
+  "sliding window" table. Read the design document for more details on
+  use cases and the expected semantics.
+
+## On the Kudu blog
+
+* Pat Patterson wrote a post about [Ingesting JSON Data into Apache Kudu with StreamSets
+  Data Collector](http://getkudu.io/2016/04/14/ingesting-json-apache-kudu-streamsets-data-collector.html).
+