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[HDFS-1614] Provide an option to saveNamespace to save namespace uncompressed - HDFS - [issue]
...With HDFS-1435, we can configure to store fsimage compressed. This jira aims to provide an option to saveNamespace command that stores the fsimage uncompressed regardless of the configuratio...
http://issues.apache.org/jira/browse/HDFS-1614    Author: Hairong Kuang, 2012-07-09, 21:28
[HDFS-15] Rack replication policy can be violated for over replicated blocks - HDFS - [issue]
...HDFS replicas placement strategy guarantees that the replicas of a block exist on at least two racks when its replication factor is greater than one. But fsck still reports that the replicas...
http://issues.apache.org/jira/browse/HDFS-15    Author: Hairong Kuang, 2012-04-12, 06:27
Re: Datanodes optimizations - HDFS - [mail # dev]
...+ Peter and hdfs-dev  Awesome, Siying! I am so impressed by the amount of work that you've done t o improve HDFS I/O.  Could you please revert r23326 r23292 and r23290? I do not th...
   Author: Hairong Kuang, 2012-03-05, 23:40
another HDFS configuration for scribeH - HDFS - [mail # dev]
...Hi Eric,  I was debugging a bizar data corruption case in the silver cluster today an d realized that there is a very important configuration that scribeH cluste r should set. Could you...
   Author: Hairong Kuang, 2011-12-02, 04:22
Re: Why datanode does a flush to disk after receiving a packet - HDFS - [mail # dev]
...A few clarification on API2 semantics.  1. Ack gets sent back to the client before a packet gets written to local files. 2. Data become visible to new readers on the condition that at l...
   Author: Hairong Kuang, 2010-11-11, 19:55
Re: [VOTE] New branch for HDFS-1052 development - HDFS - [mail # dev]
...+1. Look forward to the feature completion.  Hairong  On 8/19/10 10:00 PM, "Dhruba Borthakur"  wrote:  ...
   Author: Hairong Kuang, 2010-08-20, 06:06
Re: HDFS: buffer before contacts Namenode? - HDFS - [mail # user]
...DataNode only buffers a packet before it contacts NameNode for allocating DataNodes to place the block. The doc you read might be too old.  Hairong  On 8/9/10 7:14 PM, "elton sky" ...
   Author: Hairong Kuang, 2010-08-10, 16:55
Re: [VOTE] Commit hdfs-1024 to 0.20 branch - HDFS - [mail # dev]
...+1 Good catch!  Hairong  On Sat, Apr 3, 2010 at 12:55 PM, Andrew Purtell  wrote:  ...
   Author: Hairong Kuang, 2010-04-05, 19:08
Re: [VOTE -- Round 2] Commit hdfs-630 to 0.21? - HDFS - [mail # dev]
...+1  Hairong  On Fri, Jan 22, 2010 at 10:51 AM, Dhruba Borthakur  wrote:  ...
   Author: Hairong Kuang, 2010-01-22, 19:50
Re: Reading while appending in 0.21 - HDFS - [mail # user]
...This semantics is stated in our append specification attached to HDFS-265. Hflushed data are visible to new readers who open the file after the hflush.  Hairong  On Mon, Jan 11, 20...
   Author: Hairong Kuang, 2010-01-12, 01:42
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