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Re: Does Spark automatically run different stages concurrently when possible? - Spark - [mail # user]
...You may try to change the schudlingMode to FAIR, the default is FIFO. Takea look at this pagehttps://spark.apache.org/docs/1.1.0/job-scheduling.html#scheduling-within-an-applicationOn Sat, J...
   Author: Benyi Wang, 2015-01-10, 20:19
[expand - 2 more] - Re: How to bulkload into a specific data center? - Cassandra - [mail # user]
...On Fri, Jan 9, 2015 at 3:55 PM, Robert Coli  wrote:I'm lucky that those are virtual data centers in LAN.I just don't want to have a load burst in the "service" virtual data centerbecaus...
   Author: Benyi Wang, 2015-01-10, 20:16
Is it possible to delete columns or row using CQLSSTableWriter? - Cassandra - [mail # dev]
...CQLSSTableWriter only accepts an INSERT or UPDATE statement. I'm wonderingwhether make it accept DELETE statement.I need to update my cassandra table with a lot of data everyday.* I may need...
   Author: Benyi Wang, 2015-01-07, 21:52
Is it possible to flush memtable in one virtual center? - Cassandra - [mail # user]
...We have one ring and two virtual data centers in our Cassandra cluster? oneis for Real-Time and the other is for analytics. My questions are:   1. Are there memtables in Analytics ...
   Author: Benyi Wang, 2014-12-15, 23:22
HTTP 500 Error for SparkUI in YARN Cluster mode - Spark - [mail # user]
...I got this error when I click "Track URL: ApplicationMaster" when I run aspark job in YARN cluster mode. I found this jirahttps://issues.apache.org/jira/browse/YARN-800, but I could not get ...
   Author: Benyi Wang, 2014-12-14, 19:29
What happens at server side when using SSTableLoader - Cassandra - [mail # user]
...Is there a page explaining what happens at server side when usingSSTableLoader?I'm seeking the answers of the following questions:   1. What's about the existing data in the table?...
   Author: Benyi Wang, 2014-12-01, 21:59
[SQOOP-1714] DateSplitter makes wrong splits - Sqoop - [issue]
...If the split-by column is a Date type, Sqoop will send a query to read Min(Date) and Max(Date), those two values are passed to DateSplitter. DateSplitter converts those values into long, and...
http://issues.apache.org/jira/browse/SQOOP-1714    Author: Benyi Wang, 2014-11-12, 05:20
Custom persist or cache of RDD? - Spark - [mail # user]
...When I have a multi-step process flow like this:A -> B -> C -> D -> E -> FI need to store B and D's results into parquet filesB.saveAsParquetFileD.saveAsParquetFileIf I don't ...
   Author: Benyi Wang, 2014-11-10, 19:35
[expand - 1 more] - Re: Best practice for join - Spark - [mail # user]
...I'm using spark-1.0.0 in CDH 5.1.0. The big problem is SparkSQL doesn'tsupport Hash join in this version.On Tue, Nov 4, 2014 at 10:54 PM, Akhil Das wrote: ...
   Author: Benyi Wang, 2014-11-05, 07:43
What's wrong with my settings about shuffle/storage.memoryFraction - Spark - [mail # user]
...I don't need to cache RDDs in my spark Application, but there is a bigshuffle in the data processing. I can always find Shuffle spill (memory)and Shuffle spill (disk). I'm wondering if I can...
   Author: Benyi Wang, 2014-11-04, 19:24
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Benyi Wang
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB