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HDFS inconsistency issue - Hadoop - [mail # user]
...We are hitting a weird HDFS issue after a good number of Hadoop nodes  simultaneously crashed.  The problem is that after all the down servers came back, the HDFS complained  ...
   Author: Songting Chen, 2013-01-02, 22:32
Data Platform Engineer at Turn Inc. - Hadoop - [mail # user]
...Data Platform Engineer at Turn Inc.  If you're passionate about large-scale distributed systems, petabyte data w arehouses, NoSQL key-value stores, high throughput real-time reporting s...
   Author: Songting Chen, 2011-01-07, 21:10
Migration to 0.20.1 issue - Hadoop - [mail # user]
...Hi,   I encountered some weird problem when trying to migrate to HaDoop 0.20.1.    I have some old Map/Reduce jobs (with old APIs) that do compile and run on the new cluster. ...
   Author: Songting Chen, 2009-12-13, 05:57
JobTracker hangs after 400-500 jobs - Hadoop - [mail # user]
...No response from the HaDoop cluster then - stop/start map/reduce would solve the problem.  Note: HDFS has no such issue. Is it a common problem (we use v.19)?  Thanks, -Songting...
   Author: Songting Chen, 2009-07-06, 19:23
Hadoop IO performance, prefetch etc - Hadoop - [mail # user]
...Hi,    Most of our map jobs are IO bound. However, for the same node, the IO throughput during the map phase is only 20% of its real sequential IO capability (we tested the sequent...
   Author: Songting Chen, 2009-02-05, 06:55
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