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Re: hsync is too slower than hflush - HDFS - [mail # dev]
...Hi all,  DataNode sequential write file, so I think the disk seek time should be very small.Why is disk seek time 10ms? I think that is too long. Whether we can optimize the linux syste...
   Author: lei liu, 2013-08-26, 14:30
Re: when Standby Namenode is doing checkpoint, the Active NameNode is slow. - HDFS - [mail # user]
...The fsimage file size is 1658934155   2013/8/13 Harsh J  ...
   Author: lei liu, 2013-08-13, 06:22
Re: ./hdfs namenode -bootstrapStandby error - HDFS - [mail # user]
...Hi, Azuryy  Running the 'hdfs namenode -initializeSharedEdits'  command on the active NN ,  I must to stop the Active NameNode.  I  think when  excuting the "./...
   Author: lei liu, 2013-07-21, 04:05
Re: QJM for federation - HDFS - [mail # user]
...I have another question for QJM.  If I use QJM for HA, do I need to save edit log  on the local filesystem?  I think the QJM is high availability for edit log, so I don't need...
   Author: lei liu, 2013-07-17, 08:49
QJM and dfs.namenode.edits.dir - HDFS - [mail # user]
...When I use QJM for HA, do I need to save edit log  on the local filesystem?  I think the QJM is high availability for edit log, so I don't need to configuration the dfs.namenode.ed...
   Author: lei liu, 2013-07-17, 06:07
HDFS pread performance - HDFS - [mail # dev]
...I test the HDFS pread performance, the avg time of pread is about 10ms, but  pread max time reach 200ms, there is about one percent of pread time is 200ms, that result to my application...
   Author: lei liu, 2013-04-17, 13:54
Re: DFSOutputStream.sync() method latency time - HDFS - [mail # user]
...Thanks Yanbo for your reply.  I  test code are :         FSDataOutputStream outputStream = fs.create(path);         Random r = new Random();...
   Author: lei liu, 2013-03-29, 02:50
HA for hadoop-0.20.2 - HDFS - [mail # dev]
...I want to implement HA function for hadoop-0.20.2.  I  use the StandbyNN instance to implement the function. there is one thread to  read the edits file in share directory,exa...
   Author: lei liu, 2012-11-14, 10:22
- HDFS - [mail # user]
...http://blog.csdn.net/onlyqi/article/details/6544989 https://issues.apache.org/jira/browse/HDFS-2185 http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/HDFSHighAvailability.ht...
   Author: lei liu, 2012-10-25, 10:13
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