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RE: Confusion on the role of regionserver - HBase - [mail # user]
...The 5 RS will be connecting to all 10 DNs.  However, when writing to HDFS t he first replica always goes to the local node.  Because of this, the 5 DNs  that are hosting the 5...
   Author: Jonathan Gray, 2010-12-15, 04:56
RE: Composite key, scan on partial key - HBase - [mail # user]
...There might be a little confusion.  Specifying start/stop rows vs. scanning all rows with a filter... yes, clea rly the start/stop is far more efficient.  What Ryan is talking abou...
   Author: Jonathan Gray, 2010-12-15, 04:53
[expand - 1 more] - RE: Modifying existing table entries - HBase - [mail # user]
...Applying a filter can prevent all rows from being sent to the client (or MR  task) but HBase will still be doing a full table scan.  This can certainly  help but in the end yo...
   Author: Jonathan Gray, 2010-12-15, 04:51
RE: Build failed in Hudson: hbase-0.90 #27 - HBase - [mail # dev]
...Somehow there's a ZK session expiration that I've not seen before...  2010-12-14 22:20:25,284 ERROR [Thread-282-EventThread] zookeeper.ClientCnxn $EventThread(532): Error while calling ...
   Author: Jonathan Gray, 2010-12-15, 00:17
[expand - 1 more] - RE: HBase stability - HBase - [mail # user]
...Hey Baggio,  Looks like you've done some good analysis.  Much of what you've mentioned u nder HBase is in the works (multi-thread compactions, distributed log split ting, HBCK tool...
   Author: Jonathan Gray, 2010-12-13, 17:19
RE: Hive HBase integration scan failing - HBase - [mail # user]
...Hey,  Need some more info.  Can you paste logs from the MR tasks that fail?  What's going on in the clu ster while the MR job is running (cpu, io-wait, memory, etc)?  And...
   Author: Jonathan Gray, 2010-12-10, 09:52
RE: Is my data losed? - HBase - [mail # user]
...Jiajun,  Hard to say whether you've lost data or not.  Something looks wrong with HDFS.  What versions of HBase and HDFS are you running?  What's going on in the logs of ...
   Author: Jonathan Gray, 2010-12-10, 05:39
RE: serialized objects as strings or as object? & data corruption? - HBase - [mail # user]
...Hey Dean,  Why are you so concerned about data corruption?  Is your concern about application level bugs causing corruption, or HBase/H DFS causing the corruption?  HDFS provi...
   Author: Jonathan Gray, 2010-12-06, 21:57
[expand - 1 more] - RE: region, regionserver questions - HBase - [mail # user]
...The initial assignment if creating a table with multiple regions is random  across available RSs.  It'd probably make the most sense to pick a random starting node and do it  ...
   Author: Jonathan Gray, 2010-12-03, 05:10
RE: Quick way to find the number of rows in a Table - HBase - [mail # user]
...So you want to have an incrementing ID as the row key, and each time you ge nerate it, you're thinking about counting the number of rows? How often would you be doing this count?  Row...
   Author: Jonathan Gray, 2010-12-03, 02:25
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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