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Coprocessor runs longer than timeout, and thread safety - HBase - [mail # user]
...I have a custom co-processor endpoint that handles aggregation of various statistics for each region (the stats from all regions are then merged together for the final result). Sometimes the...
   Author: Tom Brown, 2012-08-24, 22:27
[expand - 1 more] - Re: Need to fast-forward a scanner inside a coprocessor - HBase - [mail # user]
...So I understand I'll need to upgrade to 0.94 (which won't be a problem because the releases are binary-compatible).  I see that the RegionScanner interface contains the new method "rese...
   Author: Tom Brown, 2012-08-04, 00:47
Re: Parallel scans - HBase - [mail # user]
...I think you could do it manually by looking up all the different regions and starting a separate scan for each region. Not quite as handy as the built-in multi get, but essentially the same....
   Author: Tom Brown, 2012-07-31, 19:27
Re: Query a version of a column efficiently - HBase - [mail # user]
...Somebody will correct me if I'm wrong, but I think that for your example, you should use setTimeRange(0, 5) and setMaxVersion(1).  It's my understanding that those settings will give yo...
   Author: Tom Brown, 2012-07-26, 22:05
Re: When node is down - HBase - [mail # user]
...Can it notice the node is down sooner? If that node is serving an active region (or if it's a datanode for an active region), that would be a potentially large amount of downtime.  With...
   Author: Tom Brown, 2012-06-22, 13:41
[expand - 1 more] - Re: Collation order of items - HBase - [mail # user]
...Storing the bytes as native UTF-16 or UTF-32 will not help.  Even strings in UTF-8 format can be sorted by their code points when stored as bytes.  Unfortunately, that's not really...
   Author: Tom Brown, 2012-06-08, 17:34
About cells with duplicate timestamp information - HBase - [mail # user]
...I have read all I could find regarding what happens when you have multiple cells with the exact same address (r/f/q/t), and I'm still a little confused about the resolution.  If I creat...
   Author: Tom Brown, 2012-06-07, 20:41
[expand - 1 more] - Re: When does compaction actually occur? - HBase - [mail # user]
...Lars,  In response to your earlier email, I'm not completely sure whether or not I'm using a raw scan. The scan is performed in a region server coprocessor initialized as such:   ...
   Author: Tom Brown, 2012-06-05, 21:37
[expand - 1 more] - Re: Using put for nullifying qualifiers - HBase - [mail # user]
...I didn't mean to set the version to null, I meant to include a revision of the column whose contents are empty. This empty revision will Still be returned by any gets on that row, but you ca...
   Author: Tom Brown, 2012-05-23, 13:39
Re: hbase insert performance test (from hbasemaster and regionservers) - HBase - [mail # user]
...Micheal,  This is good info. I wish you'd post what the "more" is, though.   On Mon, May 21, 2012 at 4:30 PM, Michael Segel  wrote: se an *edge* node. ead), )  , "yyyy/MM/dd a...
   Author: Tom Brown, 2012-05-21, 22:44
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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