how can we know the statistics of namenode and datanode using API's

Hi All, I have been trying to access the statistics of FSNameSystem using FSNameSystemMetrics , but i have not been able to do it yet. Am I doing it right, if not kindly guide me. I am stuck. Thanks, Vidur -- This message has been scanned for viruses and dangerous content by MailScanner, and is

[jira] Created: (HDFS-1200) The namenode could remember the last good location of a missing block

The namenode could remember the last good location of a missing block - Key: HDFS-1200 URL: https://issues.apache.org/jira/browse/HDFS-1200 Project: Hadoop HDFS Issue Type:

Re: Integrating Lustre and HDFS

Thanks for the replies. If I have fs.default.name = file://my_lustre_mount_point , then only the lustre filesystem will be used. I would like to have something like fs.default.name=file://my_lustre_mount_point , hdfs://localhost:9123 so that both local filesystem and lustre are in use. Kindly c

Re: Is it safe enough to write edit log in buffer before writing to disk ?

Hi Jeff, All of the FSNamesystem methods call logSync() before returning to the client. So, if the edit is lost, it also will not have returned a success to the client. -Todd On Thu, Jun 10, 2010 at 6:29 PM, Jeff Zhang wrote: > Hi all, > > I check the source code of EditLogFileOutputStream, it

Is it safe enough to write edit log in buffer before writing to disk ?

Hi all, I check the source code of EditLogFileOutputStream, it seems hadoop will first write edit log to buffer, then flush to disk. I know that it will improve performance, but in the other hand it will cause the edit log in buffer lost when the name node is down. So I wonder is it possible and n

[jira] Resolved: (HDFS-1198) Resolving cross-realm principals

[ https://issues.apache.org/jira/browse/HDFS-1198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jakob Homan resolved HDFS-1198. --- Fix Version/s: 0.22.0 Resolution: Fixed I've committed this. Thanks, Jitendra. Resolving as f

Re: Newbie point to start

You can checkout hadoop-20 branch from http://svn.apache.org/viewvc/hadoop/common/branches/branch-0.20/ , and build and run following the steps on the wiki. On 6/10/10 2:01 PM, "Alberich de megres" wrote: Thanks! Can i compile just the source at the repo and use it just as is? I mean, with

[jira] Created: (HDFS-1199) Extract a subset of tests for smoke (DOA) validation.

Extract a subset of tests for smoke (DOA) validation. - Key: HDFS-1199 URL: https://issues.apache.org/jira/browse/HDFS-1199 Project: Hadoop HDFS Issue Type: Improvement Components

Re: Newbie point to start

Thanks! Can i compile just the source at the repo and use it just as is? I mean, without having any hadoop source code (except the hdfs code at the web i told you). Or without the need to integrate it with a hadoop compiiled code? Just as if a diferent or standalone project. On Thu, Jun 10, 201

Re: Newbie point to start

Thanks for the quick reply, But I'm talking about just hdfs.. is it posible to test it separately? with source code available at: http://github.com/apache/hadoop-hdfs I compiled it, and now i want to test it. (aside from hadoop) On Thu, Jun 10, 2010 at 9:37 PM, Jitendra Nath Pandey wrote: > Th

Re: Newbie point to start

You can test hdfs without setting up map-reduce cluster if that's what you mean. Instead of bin/start-all.sh , use bin/start-dfs.sh and you can skip configurations related to mapreduce. To test it, use DFS command line "bin/hadoop dfs". On 6/10/10 1:16 PM, "Alberich de megres" wrote: Thanks

Newbie point to start

Hello! I'm new on HDFS, i just downloaded the source code and compiled it. Now I want to excecure it on 2 machines.. but i don't know how to start servers. Is there any web/doc or someone can point me some light on how to start? Thanks!! Alberich

Re: Newbie point to start

This link should help. http://wiki.apache.org/hadoop/QuickStart On 6/10/10 12:20 PM, "Alberich de megres" wrote: Hello! I'm new on HDFS, i just downloaded the source code and compiled it. Now I want to excecure it on 2 machines.. but i don't know how to start servers. Is there any web/do

[jira] Created: (HDFS-1198) Resolving cross-realm principals

Resolving cross-realm principals Key: HDFS-1198 URL: https://issues.apache.org/jira/browse/HDFS-1198 Project: Hadoop HDFS Issue Type: Bug Reporter: Jitendra Nath Pandey Assignee: Jiten

[jira] Created: (HDFS-1197) 0.20: TestFileAppend3.testTC2 failure

0.20: TestFileAppend3.testTC2 failure - Key: HDFS-1197 URL: https://issues.apache.org/jira/browse/HDFS-1197 Project: Hadoop HDFS Issue Type: Bug Components: data-node, hdfs client, name-node

Re: Integrating Lustre and HDFS

> Your local storage should get used for MR. Use Lustre via file:// > (LocalFileSystem, iirc) > instead of HDFS via hdfs:// (DistributedFileSystem, irrc) as the default file > system type. If Lustre has integrated checksums, you'll want to use the RawLocalFileSystem instead of LocalFileSystem.

Re: Integrating Lustre and HDFS

On Jun 10, 2010, at 2:37 AM, Vikas Ashok Patil wrote: > In my cluster I have the lustre parallel file system which mainly exposes > storage over a network. Also there is some local space on each node of the > cluster. This space is not part of the lustre file system. My hadoop > installation curre

Integrating Lustre and HDFS

Hello All, I would like to try out a hadoop configuration involving both lustre and hdfs. Hence I would like to know any thoughts/criticisms on the idea. In my cluster I have the lustre parallel file system which mainly exposes storage over a network. Also there is some local space on each node o