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[HDFS-1031] Enhance the webUi to list a few of the corrupted files in HDFS - HDFS - [issue]
...The existing webUI displays something like this:WARNING : There are about 12 missing blocks. Please check the log or run fsck. It would be nice if we can display the filenames that have miss...
http://issues.apache.org/jira/browse/HDFS-1031    Author: dhruba borthakur, 2012-11-10, 23:34
[HDFS-385] Design a pluggable interface to place replicas of blocks in HDFS - HDFS - [issue]
...The current HDFS code typically places one replica on local rack, the second replica on remote random rack and the third replica on a random node of that remote rack. This algorithm is baked...
http://issues.apache.org/jira/browse/HDFS-385    Author: dhruba borthakur, 2012-09-06, 00:52
[HDFS-978] Record every new block allocation of a file into the transaction log. - HDFS - [issue]
...HDFS should record every new block allocation (of a file) into its transaction logs. In the current code, block allocations are persisted only when a file is closed or hflush-ed. This featur...
http://issues.apache.org/jira/browse/HDFS-978    Author: dhruba borthakur, 2012-08-24, 01:26
[HDFS-1508] Ability to do savenamespace without being in safemode - HDFS - [issue]
...In the current code, the administrator can run savenamespace only after putting the namenode in safemode. This means that applications that are writing to HDFS encounters errors because the ...
http://issues.apache.org/jira/browse/HDFS-1508    Author: dhruba borthakur, 2012-07-09, 21:15
[HDFS-1509] Resync discarded directories in fs.name.dir during saveNamespace command - HDFS - [issue]
...In the current implementation, if the Namenode encounters an error while writing to a fs.name.dir directory it stops writing new edits to that directory. My proposal is to make  the nam...
http://issues.apache.org/jira/browse/HDFS-1509    Author: dhruba borthakur, 2012-07-09, 21:14
[HDFS-96] HDFS does not support blocks greater than 2GB - HDFS - [issue]
...HDFS currently does not support blocks greater than 2GB in size....
http://issues.apache.org/jira/browse/HDFS-96    Author: dhruba borthakur, 2012-07-09, 07:59
[HDFS-1094] Intelligent block placement policy to decrease probability of block loss - HDFS - [issue]
...The current HDFS implementation specifies that the first replica is local and the other two replicas are on any two random nodes on a random remote rack. This means that if any three datanod...
http://issues.apache.org/jira/browse/HDFS-1094    Author: dhruba borthakur, 2012-07-02, 16:26
[HDFS-140] When a file is deleted, its blocks remain in the blocksmap till the next block report from Datanode - HDFS - [issue]
...When a file is deleted, the namenode sends out block deletions messages to the appropriate datanodes. However, the namenode does not delete these blocks from the blocksmap. Instead, the proc...
http://issues.apache.org/jira/browse/HDFS-140    Author: dhruba borthakur, 2012-05-29, 18:42
[HDFS-3051] A zero-copy ScatterGatherRead api from FSDataInputStream - HDFS - [issue]
...It will be nice if we can get a new API from FSDtaInputStream that allows for zero-copy read for hdfs readers....
http://issues.apache.org/jira/browse/HDFS-3051    Author: dhruba borthakur, 2012-05-20, 03:51
[HDFS-2744] Extend FSDataInputStream to allow fadvise - HDFS - [issue]
...Now that we have direct reads from local HDFS block files (HDFS-2246), it might make sense to make FSDataInputStream support fadvise calls. I have an application (HBase) that would like to t...
http://issues.apache.org/jira/browse/HDFS-2744    Author: dhruba borthakur, 2012-04-13, 09:02
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