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Re: Is hadoop 1.0.0 + HBase 0.90.5 the best combination for production cluster? - HBase - [mail # user]
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...I was thinking (wrongly it seems) that having the region server read directly from the local file system would be faster than going through the data node, even with sequential ac...
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Author: Bryan Keller,
2012-02-17, 21:48
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Re: Is hadoop 1.0.0 + HBase 0.90.5 the best combination for production cluster? - HBase - [mail # user]
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...I have been experimenting with local reads. For me, enabling did not help improve read performance at all, I get the same performance either way. I can see in the data node logs ...
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Author: Bryan Keller,
2012-02-17, 21:21
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Re: xceiver count, regionserver shutdown - HBase - [mail # user]
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...Just to follow up, this did indeed fix the problem I was having with hitting the xceiver limit. Thanks a bunch for the help, I have a much better understanding of how heap, memst...
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Author: Bryan Keller,
2012-02-07, 13:13
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Re: xceiver count, regionserver shutdown - HBase - [mail # user]
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...I increased the max region file size to 4gb so I should have fewer than 200 regions per node now, more like 25. With 2 column families that will be 50 memstores per node. 5.6gb w...
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Author: Bryan Keller,
2012-02-07, 00:47
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Re: xceiver count, regionserver shutdown - HBase - [mail # user]
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...Yes, insert pattern is random, and yes, the compactions are going through the roof. Thanks for pointing me in that direction. I am going to try increasing the region max fi...
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Author: Bryan Keller,
2012-02-06, 23:18
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Re: xceiver count, regionserver shutdown - HBase - [mail # user]
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...This is happening during heavy update. I have a "wide" table with around 4 million rows that have already been inserted. I am adding billions of columns to the rows. Each row can...
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Author: Bryan Keller,
2012-02-06, 21:12
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xceiver count, regionserver shutdown - HBase - [mail # user]
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...I am trying to resolve an issue with my cluster when I am loading a bunch of data into HBase. I am reaching the "xciever" limit on the data nodes. Currently I have this set to 40...
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Author: Bryan Keller,
2012-02-06, 19:42
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Re: Using Scans in parallel - HBase - [mail # user]
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...To follow up, the problem I was having w/ parallel scanners appears to be an issue w/ my app, I wasn't able to reproduce it in a more controlled test. On Oct 9, 2011, at 8:...
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Author: Bryan Keller,
2011-10-11, 04:12
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Re: Using Scans in parallel - HBase - [mail # user]
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...BTW, a map reduce job can scan the table in 6m (both column families), including some processing. So that is the fastest approach. On Oct 9, 2011, at 8:03 PM, Bryan Keller wrote:...
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Author: Bryan Keller,
2011-10-10, 03:21
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Re: Using Scans in parallel - HBase - [mail # user]
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...Sure. 2 region servers with 5 disks each. Table has 2 column families and 113 regions total for 2m rows. I'm scanning just one of the families. Performance with the 8 parallel sc...
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Author: Bryan Keller,
2011-10-10, 03:03
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