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Re: HBase Writes With Large Number of Columns - HBase - [mail # user]
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...CellBlock == KeyValue? On Thu, Mar 28, 2013 at 12:06 AM, Ted Yu wrote: ...
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Author: Asaf Mesika,
2013-03-27, 22:28
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Re: HBase Writes With Large Number of Columns - HBase - [mail # user]
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...Correct me if I'm wrong, but you the drop is expected, according to the following math: If you have a Put, for a specific rowkey, and that rowkey weighs 100 bytes, then if you have 20 ...
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Author: Asaf Mesika,
2013-03-27, 21:52
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Re: Compaction problem - HBase - [mail # user]
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...From my testing: I had 3 RS and 1 Master all connected to a single router at speed of 1000 mbps. This network measured speed was 107 - 120 MB/sec, while the theoretic max is 125 MB/sec...
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Author: Asaf Mesika,
2013-03-27, 19:55
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Re: Compaction problem - HBase - [mail # user]
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...1st thing I would do to find the bottleneck it so benchmark HDFS solo performance. Create a 16GB file (using dd) which is x2 your memory and run "time hadoop fs -copyFromLocal yourFile.txt /...
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Author: Asaf Mesika,
2013-03-26, 21:26
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Re: Why InternalScanner doesn't have a method that returns entire row or object of Result - HBase - [mail # user]
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...Guys, Just to make things clear: if I have a row which have 12 keys values, and then another row with 5 KVs, and I called InternelScanner(results, 10), where 10 is the limit, then I wo...
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Author: Asaf Mesika,
2013-03-07, 12:34
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Re: Rowkey design and presplit table - HBase - [mail # user]
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...I would convert each id to long and then use Bytes.toBytes to convert this long to a byte array. If it is an int then even better. Now, write all 3 longs one after another to one array which...
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Author: Asaf Mesika,
2013-03-07, 07:42
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Re: HBase Thrift inserts bottlenecked somewhere -- but where? - HBase - [mail # user]
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...Make sure you are not sending a lot of put of the same rowkey. This can cause contention in the region server side. We fixed that in our project by aggregating all the columns for the same r...
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Author: Asaf Mesika,
2013-03-02, 19:56
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Re: Map Reduce with multiple scans - HBase - [mail # user]
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...Nick, if he didn't specify startKey, endKey in the Scan Object, and delegate it to a Filter, this means he will send this scan to *all* regions in the system, instead of just one or two, no?...
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Author: Asaf Mesika,
2013-03-01, 14:17
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Re: HBase Thrift inserts bottlenecked somewhere -- but where? - HBase - [mail # user]
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...Maybe you've the limit of the number of RPC Threads handling your write requests per Region Server, thus your requests are queued? On Fri, Mar 1, 2013 at 2:17 PM, Dan Crosta wro...
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Author: Asaf Mesika,
2013-03-01, 14:13
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Re: Row Key Design in time based aplication - HBase - [mail # user]
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...How does avoid memory hogging the region server when multiple queries with group by are executed, which is done in Hbase jvm. I know that Hbase does not handle well when heap space is set be...
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Author: Asaf Mesika,
2013-02-21, 22:49
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