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Re: hbase 0.94.0 - HBase - [mail # dev]
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...I had assumed facebook had integrated HFileV2 into their 0.89 branch a while back and that pretty much all HFiles would have been converted to v2 by now. I guess that is not correct......
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Author: Matt Corgan,
2012-01-30, 20:01
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Re: hbase 0.94.0 - HBase - [mail # dev]
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...The reason I brought it up is now that Mikhail committed the data block encoding I was going to take a stab at adding the prefix trie encoding I was working on this past summer. My pla...
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Author: Matt Corgan,
2012-01-27, 20:06
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Re: hbase 0.94.0 - HBase - [mail # dev]
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...It would be a simple, read-only script that iterates through your hbase directory on hdfs, looks at each file, and prints out any regions or tables that contain v1 files. Either you've...
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Author: Matt Corgan,
2012-01-27, 01:21
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Re: hbase 0.94.0 - HBase - [mail # dev]
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...Maybe add a script to 0.92 (part of hbck?) that verifies that all of your HFiles have been upgraded, and then you can trigger major compactions on any that haven't been. On a slightly ...
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Author: Matt Corgan,
2012-01-26, 20:31
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Re: hbase 0.94.0 - HBase - [mail # dev]
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...Are there any thoughts about when it is ok to stop being backwards compatible? Mainly thinking of HFileV1... 0.92 will convert all HFileV1's to HFileV2's, so it would probably have bee...
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Author: Matt Corgan,
2012-01-26, 19:51
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Re: RegionServer dying every two or three days - HBase - [mail # user]
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...You could always try going with a little smaller heap and see how it works for your particular workload, maybe 4G. 1G block cache, 1G memstores, ~1G GC overhead(?), leaving 1G for acti...
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Author: Matt Corgan,
2012-01-23, 18:37
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Re: RegionServer dying every two or three days - HBase - [mail # user]
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...We actually don't run map/reduce on the same machines (most of our jobs are on an old message based system), so don't have much experience there. We run only HDFS (1G heap) and HBase (...
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Author: Matt Corgan,
2012-01-21, 19:48
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Re: RegionServer dying every two or three days - HBase - [mail # user]
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...I run c1.xlarge servers and have found them very stable. I see 100 Mbit/s sustained bi-directional network throughput (200Mbit/s total), sometimes up to 150 * 2 Mbit/s. Here's a ...
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Author: Matt Corgan,
2012-01-20, 20:07
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Re: Limited cross row transactions - HBase - [mail # dev]
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... I thought BigTable/Megastore handled this kind of thing by putting everything into a single row with the entity group id as the hbase rowKey. Then you add all parent and child va...
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Author: Matt Corgan,
2012-01-18, 01:15
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Re: Early comparisons between 0.90 and 0.92 - HBase - [mail # dev]
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...I was hoping to rule out changes in IPC handlers and other upper layers and narrow it down to the difference between HFileV1 and HFileV2, but it sounds like you have a lot of moving pieces. ...
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Author: Matt Corgan,
2011-12-15, 20:29
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