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Re: VOTE: HDFS-347 merge - HDFS - [mail # dev]
...Hi Azuryy,  The branch adds new APT documentation which describes the new configuration that is needed. It's in ./hadoop-hdfs-project/hadoop-hdfs/src/site/apt/ShortCircuitLocalReads.apt...
   Author: Colin McCabe, 2013-04-12, 20:06
Re: testHDFSConf.xml - HDFS - [mail # dev]
...On Wed, Apr 10, 2013 at 10:16 AM, Jay Vyas  wrote:  "supergroup" is the default supergroup in HDFS.  Check DFSConfigKeys.java:    public static final String  DF...
   Author: Colin McCabe, 2013-04-10, 17:43
Re: Heartbeat interval and timeout: why 3 secs and 10 min? - HDFS - [mail # dev]
...My understanding is that the 10 minute timeout helps to avoid replication storms, especially during startup.  You might be interested in HDFS-3703, which adds a "stale" state which data...
   Author: Colin McCabe, 2013-03-13, 18:08
Re: How to remove three disks from three different nodes in a ten node cluster in less than an hour without losing replicas? - HDFS - [mail # user]
...It sounds like what you would like is a way to decommission just one storage directory on the DataNode. We don't currently support that.  You might be able to get something approaching ...
   Author: Colin McCabe, 2013-02-04, 22:53
Re: JournalNode desynchronized - HDFS - [mail # user]
...You can rsync from one of your other JournalNodes into the correct directory on the new one. You can safely do this while the old one is running.  In the future, there will be a way to ...
   Author: Colin McCabe, 2013-02-04, 22:49
HDFS-347 (Short-circuit local reads with security) - HDFS - [mail # dev]
...Hi all,  The HDFS-347 branch implements short-circuit local reads with support for security.  This is just a "heads up" that it is getting ready to merge, and we will probably send...
   Author: Colin McCabe, 2013-01-16, 04:41
Re: /etc/hosts - HDFS - [mail # user]
...Hi Pavel,  There's some information about the need for here:  http://www.leonardoborda.com/blog/127-0-1-1-ubuntu-debian/  If you have more questions about this, I re...
   Author: Colin McCabe, 2013-01-14, 20:36
Re: question about ZKFC daemon - HDFS - [mail # user]
...On Mon, Jan 14, 2013 at 11:49 AM, Colin McCabe  wrote:  Er, this should read "You also need to run ZooKeeper on at least 3 nodes."  ZKFC, which talks to ZooKeeper, runs on onl...
   Author: Colin McCabe, 2013-01-14, 20:34
Re: Release of Decompressor resources in CodecPool - HDFS - [mail # dev]
...I think that you're right.  It looks like BuiltInGzipDecompressor, which is marked as DoNotPool, ends up owning some JNI-managed resources.  In this case, just relying on the GC to...
   Author: Colin McCabe, 2012-12-27, 21:08
Re: Recovering fsImage from Namenode Logs - HDFS - [mail # dev]
...On Thu, Dec 20, 2012 at 12:33 AM, ishan chhabra  wrote:  The generation stamp is stored by the datanode in the block directory, as part of the .meta filename.  For example, if...
   Author: Colin McCabe, 2012-12-27, 20:41
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