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[expand - 1 more] - Re: kerberos ticket renewal for hadoop services - Hadoop - [mail # user]
...thanks! it makes sense to use loginUserFromKeytab initially and thencheckTGTAndReloginFromKeytab or reloginFromKeytab periodically.  i will tryto find the usage of these in the code for...
   Author: Koert Kuipers, 2014-06-30, 02:03
FileSystem.closeAll(UserGroupInformation ugi) does not remove filesystem from cache - Hadoop - [mail # user]
...why does FileSystem.closeAll(UserGroupInformation ugi) not remove theFileSystem from the cache?for example,  closeAll(boolean onlyAutomatic) does remove filesystems fromthe cache...than...
   Author: Koert Kuipers, 2014-05-27, 19:42
[expand - 1 more] - Re: kerberos principals per node necessary? - Hadoop - [mail # user]
...interesting! thanks for that information, very helpfulOn Mon, Feb 3, 2014 at 6:04 PM, Benoy Antony  wrote: ...
   Author: Koert Kuipers, 2014-02-04, 04:34
[expand - 1 more] - Re: kerberos for outside threads - Hadoop - [mail # user]
...Hey Haohui, Thanks for responding. I understand that I can disable security. I am wondering if I should in this situation. Or to turn the question around: is there a significant benefit to t...
   Author: Koert Kuipers, 2014-01-22, 02:09
high availability - Hadoop - [mail # user]
...i have been playing with high availability using journalnodes and 2 masters both running namenode and hbase master.  when i kill the namenode and hbase-master processes on the active ma...
   Author: Koert Kuipers, 2013-10-11, 23:51
[expand - 1 more] - Re: concurrency - Hadoop - [mail # user]
...Hey Harsh & Joep,  My main worry was actually the simpler situation in which only new subdirs are created by loaders. If we for a second focus on this "append-only" situation, which i a...
   Author: Koert Kuipers, 2012-10-12, 17:05
[expand - 1 more] - Re: fs cache giving me headaches - Hadoop - [mail # user]
...I am a little confused.... I do create new ugis, and i do not hand them off to threads. However i assumed that FileSystem.get(conf) would fetch from the filesystem cache based on the ugi (ba...
   Author: Koert Kuipers, 2012-08-07, 15:44
is hadoop FileSystem class thread-safe? - Hadoop - [mail # user]
...Can i share one instance safely amount multiple threads?...
   Author: Koert Kuipers, 2012-08-05, 22:13
[expand - 1 more] - Re: hadoop FileSystem.close() - Hadoop - [mail # user]
...my suspicion is that fs.close() closes the FileSystem in the cache, regardless of whether if it is used by other processes as well at that point (as opposed to a system where the cache keeps...
   Author: Koert Kuipers, 2012-07-24, 17:50
memory usage tasks - Hadoop - [mail # user]
...silly question, but i have our hadoop slave boxes configured with 7 mappers each, yet i see java 14 process for user mapred on each box. and each process takes up about 2GB, which is equals ...
   Author: Koert Kuipers, 2012-06-09, 00:49
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