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Re: metics v1 in hadoop-2.0.5 - MapReduce - [mail # user]
...metrics v1 is deprecated, both in 1.2 and 2.x.  the existence of hadoop-metrics.properties is confusing, I think it should be removed.   On Mon, Aug 5, 2013 at 6:26 PM, lei liu &nb...
   Author: Binglin Chang, 2013-08-05, 10:50
[MAPREDUCE-4944] Backport YARN-40 to support listClusterNodes and printNodeStatus in command line tool - MapReduce - [issue]
...support listClusterNodes and printNodeStatus in command line tool is useful for admin to create certain automation tools, this can also used by MAPREDUCE-4900 to get TaskTracker name so can ...
http://issues.apache.org/jira/browse/MAPREDUCE-4944    Author: Binglin Chang, 2013-05-14, 06:14
[MAPREDUCE-3247] Add hash aggregation style data flow and/or new API - MapReduce - [issue]
...In many join/aggregation like queries run on top of mapreduce, sort is not need, in fact a hash table based join/aggregation is more efficient, this is described in "Tenzing A SQL Implementa...
http://issues.apache.org/jira/browse/MAPREDUCE-3247    Author: Binglin Chang, 2012-12-11, 01:59
[expand - 1 more] - Re: problem with hadoop-snappy - MapReduce - [mail # user]
...Have you installed snappy library (which should have libsnappy.so in /usr/lib or /usr/local/lib) first?    On Wed, Nov 7, 2012 at 5:30 AM,  wrote:  ...
   Author: Binglin Chang, 2012-11-07, 01:34
Re: Tools for extracting data from hadoop logs - MapReduce - [mail # user]
...Hi,  I think you want to analyze hadoop job logs in jobtracker history folder? These logs are in a centralized folder and don't need tools like flume or scribe to gather them. I used to...
   Author: Binglin Chang, 2012-10-30, 03:24
[MAPREDUCE-3612] Task.TaskReporter.done method blocked for some time when task is finishing - MapReduce - [issue]
...We recently have done some tests to evaluate performances of different Hadoop versions(1.0, 0.23, Baidu internal version), and found some weird results. One of them is in 1.0 Task.TaskReport...
http://issues.apache.org/jira/browse/MAPREDUCE-3612    Author: Binglin Chang, 2012-07-07, 00:31
Re: Chaining multiple reducers most efficiently - MapReduce - [mail # user]
...No... Maybe in the future  On Sun, Mar 4, 2012 at 10:23 PM, IGZ Nick  wrote:  ...
   Author: Binglin Chang, 2012-03-04, 15:00
Re: reduce output compression of Terasort - MapReduce - [mail # user]
...As far as I know, TeraOutputFormat don't support compression  On Fri, Feb 17, 2012 at 6:16 PM,  wrote:  he *)....
   Author: Binglin Chang, 2012-02-17, 12:05
[MAPREDUCE-3397] Support no sort dataflow in map output and reduce merge phrase - MapReduce - [issue]
...In our experience, many data aggregation style queries/jobs don't need to sort the intermediate data. In fact reducer side can use hashmap or even array to do application level aggregations....
http://issues.apache.org/jira/browse/MAPREDUCE-3397    Author: Binglin Chang, 2012-01-12, 17:56
Re: Performance of direct vs indirect shuffling - MapReduce - [mail # user]
... Have someone ever considered a general data transfer service bundled with YARN? So other applications(rather than MR) can also benefits from it. The data transfer service looks like re...
   Author: Binglin Chang, 2011-12-21, 06:07
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