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[HDFS-395] DFS Scalability: Incremental block reports - HDFS - [issue]
...I have a cluster that has 1800 datanodes. Each datanode has around 50000 blocks and sends a block report to the namenode once every hour. This means that the namenode processes a block repor...
http://issues.apache.org/jira/browse/HDFS-395    Author: dhruba borthakur, 2013-02-01, 12:40
[HDFS-1108] Log newly allocated blocks - HDFS - [issue]
...The current HDFS design says that newly allocated blocks for a file are not persisted in the NN transaction log when the block is allocated. Instead, a hflush() or a close() on the file pers...
http://issues.apache.org/jira/browse/HDFS-1108    Author: dhruba borthakur, 2012-12-03, 07:33
[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
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