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[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
[HDFS-233] Support for snapshots - HDFS - [issue]
...Support HDFS snapshots. It should support creating snapshots without shutting down the file system. Snapshot creation should be lightweight and a typical system should be able to support a f...
http://issues.apache.org/jira/browse/HDFS-233    Author: dhruba borthakur, 2012-03-21, 17:50
[HDFS-2253] Create a benchmark to measure performance of "append" to HDFS files - HDFS - [issue]
...The HDFS appends would need to be measured at scale. It would be nice if DFSTestIO can be enhanced to measure performance of appends to HDFS files....
http://issues.apache.org/jira/browse/HDFS-2253    Author: dhruba borthakur, 2012-02-29, 23:31
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