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Re: speeding up rowcount - HBase - [mail # user]
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...Since a RowCounter uses FirstKeyOnlyFilter, we can have a default Scan cache value of 500 or so? Himanshu On Sun, Oct 9, 2011 at 9:44 AM, Ted Yu wrote: OWS))); r. y ny -...
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Author: Himanshu Vashishtha,
2011-10-09, 16:26
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Re: speeding up rowcount - HBase - [mail # user]
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...Since a MapReduce is a separate process, try with a high Scan cache value. http://hbase.apache.org/book.html#perf.hbase.client.caching Himanshu On Sun, Oct 9, 2011 at 9:09 ...
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Author: Himanshu Vashishtha,
2011-10-09, 15:19
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Re: Coprocessor execution - HBaseServer: (responseTooSlow) java.nio.channels.ClosedChannelException - HBase - [mail # user]
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...Hey Mayuresh! Can you try setting the Scan cache value to a good number (like a few 100 or more)? Cheers, Himanshu On Mon, Sep 26, 2011 at 9:01 AM, Himanshu Vashishtha &nb...
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Author: Himanshu Vashishtha,
2011-09-26, 16:38
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Re: how to make tuning for hbase (every couple of days hbase region sever/s crashe) - HBase - [mail # user]
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...Sorry, I missed the fact that you guys were talking about the oome thing (the exceptions were of sockettimeout) Can you give the log snippet where it oome'd? I want to explore this use case ...
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Author: Himanshu Vashishtha,
2011-09-01, 00:28
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Re: how to make tuning for hbase (every couple of days hbase region sever/s crashe) - HBase - [mail # user]
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...Are you doing some intensive tasks at the RegionServer side (which takes more than default time out of, 60 sec -> iirc)? One can get these exception when client side socket connection is ...
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Author: Himanshu Vashishtha,
2011-08-24, 00:02
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Re: Coprocessors and batch processing - HBase - [mail # user]
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...Hey Lars, Sorry if I have mislead you. The current Coprocessor infrastructure is at _Region_ level, not at _RegionServer_ level. All these batch operations are ultimately ends up at so...
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Author: Himanshu Vashishtha,
2011-08-11, 18:39
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Re: Coprocessors and batch processing - HBase - [mail # user]
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...Client side batch processing is done at RegionServer level, i.e., all Action objects are grouped together per RS basis and send in one RPC. Once the batch arrives at a RS, it gets distribute...
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Author: Himanshu Vashishtha,
2011-08-11, 06:21
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Re: Hbase performance with HDFS - HBase - [mail # user]
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...Mohit, just like how SSTables are stored on GFS? BigTable sstable => HBase HFile. Does this help? Himanshu On Thu, Jul 7, 2011 at 12:53 PM, Mohit Anchlia wrote: ...
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Author: Himanshu Vashishtha,
2011-07-07, 18:59
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Re: Socket Timeout Exception when executing coprocessor - HBase - [mail # user]
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...Hey Nichole, you are doing something compute intensive at the region level in your coprocessors and it is not able to respond back with in the default client timeout of 60 sec. Aggregate Cop...
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Author: Himanshu Vashishtha,
2011-06-29, 23:08
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Re: Best practices for HBase in EC2? - HBase - [mail # user]
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...Hey Wilson, I will be rerunning experiments up there on ec2 and interested to know your experience about Whirr, in case you tried it. Interested in bash scripts vs Whirr thing for a scenario...
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Author: Himanshu Vashishtha,
2011-06-23, 21:33
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