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[MAPREDUCE-4944] Backport YARN-40 to support listClusterNodes and printNodeStatus in command line tool - MapReduce - [issue]
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...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 ...
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http://issues.apache.org/jira/browse/MAPREDUCE-4944
Author: Binglin Chang,
2013-05-14, 06:14
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[MAPREDUCE-2841] Task level native optimization - MapReduce - [issue]
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...I'm recently working on native optimization for MapTask based on JNI. The basic idea is that, add a NativeMapOutputCollector to handle k/v pairs emitted by mapper, therefore sort, spill, IFi...
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http://issues.apache.org/jira/browse/MAPREDUCE-2841
Author: Binglin Chang,
2012-12-11, 08:52
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[MAPREDUCE-3247] Add hash aggregation style data flow and/or new API - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-3247
Author: Binglin Chang,
2012-12-11, 01:59
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Re: problem with hadoop-snappy - MapReduce - [mail # user]
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...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: ...
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Author: Binglin Chang,
2012-11-07, 01:34
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Re: problem with hadoop-snappy - MapReduce - [mail # user]
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...I think hadoop-1.0.4 already have snappy included, you should not using other third party libraries. On Tue, Nov 6, 2012 at 9:10 AM, wrote: ...
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Author: Binglin Chang,
2012-11-06, 02:06
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Re: Tools for extracting data from hadoop logs - MapReduce - [mail # user]
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...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...
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Author: Binglin Chang,
2012-10-30, 03:24
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[MAPREDUCE-3612] Task.TaskReporter.done method blocked for some time when task is finishing - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-3612
Author: Binglin Chang,
2012-07-07, 00:31
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Re: Chaining multiple reducers most efficiently - MapReduce - [mail # user]
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...No... Maybe in the future On Sun, Mar 4, 2012 at 10:23 PM, IGZ Nick wrote: ...
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Author: Binglin Chang,
2012-03-04, 15:00
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Re: reduce output compression of Terasort - MapReduce - [mail # user]
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...As far as I know, TeraOutputFormat don't support compression On Fri, Feb 17, 2012 at 6:16 PM, wrote: he *)....
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Author: Binglin Chang,
2012-02-17, 12:05
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[MAPREDUCE-3397] Support no sort dataflow in map output and reduce merge phrase - MapReduce - [issue]
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...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....
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http://issues.apache.org/jira/browse/MAPREDUCE-3397
Author: Binglin Chang,
2012-01-12, 17:56
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