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about hadoop memory usage - HDFS - [mail # dev]
...hi,all:        if i allocate 2G memory to NN, and i get memory usage info from jmx interface ,i add the max value of heapmemoryusage and nonheapmemorusage ,the total numb...
   Author: ch huang, 2013-11-20, 06:50
is block pool on NN or DN? - HDFS - [mail # dev]
...hi,all:          i have a question about block pool,i read the code ,it seems block pool is on DN,but NN also has a block pool manager to manage all block pool,so th...
   Author: ch huang, 2013-11-20, 05:26
when datanode will delete these invalidate blocks? - HDFS - [mail # dev]
...hi,all:          i read the replication monitor code ,in   *invalidateWork *call it just add the invalidate block into the invalidateBlocks list of the Datanode...
   Author: ch huang, 2013-11-19, 05:19
[expand - 1 more] - Re: what is different between CorruptBlocks and MissingBlocks in NN FSNamesystem metrics? - HDFS - [mail # dev]
...thank you !  On Mon, Nov 18, 2013 at 11:48 PM, Kihwal Lee  wrote:  ...
   Author: ch huang, 2013-11-19, 00:27
issue about TotalLoad metrics on FSNamesystem - HDFS - [mail # user]
...hi,all:              what is TotalLoad mean? i have 4 DN, and the option "dfs.datanode.max.transfer.threads" is 4096 ,but i check this metric  the val...
   Author: ch huang, 2013-11-18, 09:30
issue about FSNamesystem metrics - HDFS - [mail # user]
...hi,all:   i check the NN metrics ,and find the  "TransactionsSinceLastCheckpoint" is a negtive number, but why it will be a negtive number,after the last check point ,if no transac...
   Author: ch huang, 2013-11-18, 08:53
Re: issue about add disk on DN - HDFS - [mail # user]
...yes ,but if one of disks is full,the totol io bandwidth also will reduce  On Thu, Nov 7, 2013 at 11:31 AM, Andrew Wright  wrote:  ...
   Author: ch huang, 2013-11-07, 05:25
issue about combine map task output - HDFS - [mail # user]
...hi,all:          i read the doc ,and have a question about combine,if i set min.num.spills.for.combine = 3 ,so when the 3rd spill happened,the combine also happend b...
   Author: ch huang, 2013-10-10, 02:14
issue about invisible data in haoop file - HDFS - [mail # user]
...hi,all:            i have a question,i start pump data into hadoop file,but i find the file size is zero,but if i use hadoop fs -cat file ,i can see the data ,i...
   Author: ch huang, 2013-09-25, 07:30
distcp failed "Copy failed: ENOENT: No such file or directory" - HDFS - [mail # user]
...# sudo -u hdfs hadoop distcp hdfs://192.168.10.22:9000/alex hdfs:// 192.168.10.220/benchmarks 13/09/06 15:34:11 INFO tools.DistCp: srcPaths=[hdfs:// 192.168.10.22:9000/alex] 13/09/06 15:34:1...
   Author: ch huang, 2013-09-06, 07:36
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