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[HADOOP-7982] UserGroupInformation fails to login if thread's context classloader can't load HadoopLoginModule - Hadoop - [issue]
...In a few hard-to-reproduce situations, we've seen a problem where the UGI login call causes a failure to login exception with the following cause:Caused by: javax.security.auth.login.LoginEx...
http://issues.apache.org/jira/browse/HADOOP-7982    Author: Todd Lipcon, 2012-03-05, 02:49
[HADOOP-7739] Reconcile FileUtil and SecureIOUtils APIs between 20x and trunk - Hadoop - [issue]
...The 0.20.20x has introduced various public APIs to these classes which aren't in trunk. For example, FileUtil.setPermission exists in 20x but not trunk. If people start to depend on these pu...
http://issues.apache.org/jira/browse/HADOOP-7739    Author: Todd Lipcon, 2012-03-03, 16:02
[HADOOP-7896] HA: if both NNs are in Standby mode, client needs to try failing back and forth several times with sleeps - Hadoop - [issue]
...For a manual failover, there may be an intermediate state for a non-trivial amount of time where both NNs are in standby mode. Currently, the failover proxy will immediately failover on rece...
http://issues.apache.org/jira/browse/HADOOP-7896    Author: Todd Lipcon, 2012-02-29, 13:05
Re: [VOTE] Release Apache Hadoop 0.23.1-rc2 - Hadoop - [mail # general]
...On Wed, Feb 22, 2012 at 7:51 PM, Vinod Kumar Vavilapalli  wrote:  Let me clarify: HDFS-2991 basically has two halves: First half (been present "forever"): when we append() on a blo...
   Author: Todd Lipcon, 2012-02-23, 05:00
Re: .23 compile times - Hadoop - [mail # dev]
...Hi Sriram,  I also do -Dmaven.skip.javadoc=true usually and that cuts out a couple minutes. Unless you need a tarball, you can also drop -Ptar.  When I'm just making quick changes ...
   Author: Todd Lipcon, 2012-02-15, 18:47
Re: Addendum to Hypertable vs. HBase Performance Test (w/ mslab enabled) - Hadoop - [mail # user]
...Hey Doug,  Want to also run a comparison test with inter-cluster replication turned on? How about kerberos-based security on secure HDFS? How about ACLs or other table permissions even ...
   Author: Todd Lipcon, 2012-02-13, 19:33
Re: [VOTE] Release hadoop-0.23.1-rc0 - Hadoop - [mail # general]
...I just committed HDFS-2923 to branch-0.23. This bug can cause big performance issues on the NN since the number of IPC handlers will default way too low and won't be changed with the expecte...
   Author: Todd Lipcon, 2012-02-09, 08:05
Re: [DISCUSS] Stop support for non-packaged i.e. developer build single-node installs - Hadoop - [mail # dev]
...On Wed, Jan 18, 2012 at 3:29 PM, Eric Yang  wrote:  I personally develop and unit-test in Eclipse but I find managing Eclipse's "run configurations" a giant pain in the butt. I'd r...
   Author: Todd Lipcon, 2012-01-23, 21:29
Re: effect on data after topology change - Hadoop - [mail # user]
...Hi Ravi,  You'll probably need to up the replication level of the affected files and then drop it back down to the desired level. Current versions of HDFS do not automatically repair ra...
   Author: Todd Lipcon, 2012-01-17, 18:41
Re: hadoop filesystem cache - Hadoop - [mail # user]
...There is some work being done in this area by some folks over at UC Berkeley's AMP Lab in coordination with Facebook. I don't believe it has been published quite yet, but the title of the pr...
   Author: Todd Lipcon, 2012-01-16, 00:33
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