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sarang anajwala
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Greece Turkey Trip
A long overdue long trip... We haven't had a long trip since our 9 day Kerala trip in 2012. The thought of this long trip was trigerred by a mandatory week off in office. Sitting at home for one week was absolute not an option. First choice for the travel w...

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Hive Performance Improvement - statistics and file format checks
Following are couple of important configuration changes that
can improve the performance of hive queries (specially insert queries)
great deal. hive.stats.autogather By default 'hive.stats.autogather' is 'true'. This setting governs collection of statisti...

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Impact of NULL values on where-clause/group-by-clause in Hive queries
Following is the check to verified that NULL values do not impact GROUP BY but it DOES IMPACT where clause. Query: select count(*) from ap_pl1_o2_activity_count_hourly where
(identity_operation is NULL) AND dth >= '2014-12-01-00' AND dth <=
'2014-12-01-23...

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Cost optimization through performance improvement of S3DistCp
We reduced the cost of running our production cluster by about 60% by reducing total size of production cluster from 15 nodes to 6 nodes through performance tuning of AWS utility S3DistCp. This page provides some details about the same. What is S3DistCp Apa...

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Indian Govt on reforms spree....
Amidst all the 'hot news' about elections in states of Maharastra and Haryana, BJP Govt has taken some important steps for economic reforms in a very short span of time. - Labor reforms to boost manufacturing (16-Oct-2014) - Diesel price deregulation (19-Oc...

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Collections in CQL3 - How they are stored
If you don’t already know about collections in Cassandra
CQL, following page provides excellent details about the same – http://www.datastax.com/dev/blog/cql3_collections However, if you have been using cassandra from pre-CQL days,
you would have worked wit...

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If you don’t already know about collections in Cassandra
CQL, following page provides excellent details about the same – http://www.datastax.com/dev/blog/cql3_collections However, if you have been using cassandra from pre-CQL days,
you would have worked wit...

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GC overhead limit exceeded
-                   Error : java.lang.OutOfMemoryError:
GC overhead limit exceeded       Description of the problem : The
process is running a very heavy GC activity, which means most of the CPU is
utilized for GC and not enough CPU is left for execution of...
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