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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
[expand - 1 more] - 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
Re: FSDataInputStream.read returns -1 with growing file and never continues reading - HDFS - [mail # dev]
...Also, read() returning -1 is not an error, it's EOF.  This is the same as for the regular Java InputStream.  best, Colin   On Thu, Dec 20, 2012 at 10:32 AM, Christoph Rupp &nb...
   Author: Colin McCabe, 2012-12-27, 20:37
Re: Can we declare some HDFS nodes "primary" - HDFS - [mail # user]
...It seems like those 10 nodes out of 500 would be a hot spot for writes, if there was a hard requirement that they accept all writes. This might be acceptable on a very read-focused workload,...
   Author: Colin McCabe, 2012-12-11, 23:53
Re: Hadoop V/S Cassandra - HDFS - [mail # user]
...On Thu, Dec 6, 2012 at 8:55 AM, yogesh dhari  wrote:  As Harsh commented, HDFS doesn't have a single point of failure any more.  Hadoop and Cassandara are not really competito...
   Author: Colin McCabe, 2012-12-06, 19:27
Re: How to speedup test case running? - HDFS - [mail # dev]
...Hi,  You can run a specific test with mvn eclipse -Dtest=  I find that junit tests start more quickly when run within Eclipse. If you're interested, you can find instructions on se...
   Author: Colin McCabe, 2012-10-22, 18:04
Re: MiniDFSCluster - HDFS - [mail # dev]
...Hi Vlad,  I think you might be on to something.  File a JIRA?  It should be a simple improvement, I think.  cheers, Colin   On Wed, Sep 5, 2012 at 10:42 AM, Vladimir...
   Author: Colin McCabe, 2012-09-05, 20:19
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