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[HDFS-4449] When a decommission is awaiting closure of live blocks, show the block IDs on the NameNode's UI report - HDFS - [issue]
...It is rather common for people to be complaining about 'DN decommission' hangs cause of live blocks waiting to get completed by some app (especially certain HBase specifics cause a file to b...
http://issues.apache.org/jira/browse/HDFS-4449    Author: Harsh J, 2014-07-25, 20:07
[HDFS-4257] The ReplaceDatanodeOnFailure policies could have a forgiving option - HDFS - [issue]
...Similar question has previously come over HDFS-3091 and friends, but the essential problem is: "Why can't I write to my cluster of 3 nodes, when I just have 1 node available at a point in ti...
http://issues.apache.org/jira/browse/HDFS-4257    Author: Harsh J, 2014-07-23, 22:04
[HDFS-5189] Rename the "CorruptBlocks" metric to "CorruptReplicas" - HDFS - [issue]
...The NameNode increments a "CorruptBlocks" metric even if only one of the block'sreplicas is reported corrupt (genuine checksum fail, or even if areplica has a bad genstamp). In cases where t...
http://issues.apache.org/jira/browse/HDFS-5189    Author: Harsh J, 2014-07-10, 17:18
[HDFS-2571] Error encountered while attempting a dfsadmin -report - HDFS - [issue]
...Saw this while trying some things on HDFS-2569➜  hadoop-0.23.0  bin/hdfs dfsadmin -reportlog4j:ERROR Could not find value for key log4j.appender.NullAppenderlog4j:ERROR Could not i...
http://issues.apache.org/jira/browse/HDFS-2571    Author: Harsh J, 2014-04-03, 03:28
[HDFS-3590] Print a WARN if the edit log sync period takes more than X time units - HDFS - [issue]
...If an logSync operation, which happens for calls such as FS#create() after the edit has been made at the NN metadata, takes longer than X seconds (I'd say if it took more than a minute, ther...
http://issues.apache.org/jira/browse/HDFS-3590    Author: Harsh J, 2014-03-17, 17:18
[HDFS-3570] Balancer shouldn't rely on "DFS Space Used %" as that ignores non-DFS used space - HDFS - [issue]
...Report from a user here: https://groups.google.com/a/cloudera.org/d/msg/cdh-user/pIhNyDVxdVY/b7ENZmEvBjIJ, post archived at http://pastebin.com/eVFkk0A0This user had a specific DN that had a...
http://issues.apache.org/jira/browse/HDFS-3570    Author: Harsh J, 2014-02-19, 00:56
[HDFS-5802] NameNode does not check for inode type before traversing down a path - HDFS - [issue]
...This came up during the discussion on a forum at http://community.cloudera.com/t5/Batch-Processing-and-Workflow/Permission-denied-access-EXECUTE-on-getting-the-status-of-a-file/m-p/5049#M162...
http://issues.apache.org/jira/browse/HDFS-5802    Author: Harsh J, 2014-01-21, 05:22
Re: Need idea for mapreduce - HDFS - [mail # user]
...You seem to have it right - why not give it a try before asking? :)  On Mon, Jan 6, 2014 at 10:42 AM, unmesha sreeveni  wrote:    Harsh J...
   Author: Harsh J, 2014-01-06, 07:10
Re: What makes a map to fail? - HDFS - [mail # user]
...Every failed task typically carries a diagnostic message and a set of logs for you to investigate what caused it to fail. Try visiting the task's logs on the JT UI by clicking through indivi...
   Author: Harsh J, 2014-01-05, 21:21
Re: Cutting a line in between while creating blocks - HDFS - [mail # user]
...HDFS is agnostic about the contents of the data you store. Think about it: Line ending character is not the universal way for files to separate their records.  This question's been aske...
   Author: Harsh J, 2014-01-04, 11:03
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