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[HDFS-1094] Intelligent block placement policy to decrease probability of block loss
...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...
, 2014-07-30, 18:42
[HDFS-385] Design a pluggable interface to place replicas of blocks in HDFS
...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...
, 2014-07-30, 18:42
[HDFS-289] HDFS should blacklist datanodes that are not performing well
...On a large cluster, a few datanodes could be under-performing. There were cases when the network connectivity of a few of these bad datanodes were degraded, resulting in long long times (in ...
, 2014-07-30, 09:09
[HDFS-255] Create a user-guide for describing HDFS symlinks
...HADOOP-4044 introduces symlinks in HDFS. We need a user-guide (aka man-page) that describes the semantics of this new construct.....
, 2014-07-22, 21:41
[HDFS-269] Implement seek for HftpFileSystem
...Support seek in the HftpFileSystem. This is useful for a host of applications that need to access data from a hadoop cluster running a different version of hadoop....
, 2014-07-22, 20:53
[HDFS-220] Transparent archival and restore of files from HDFS
...There should be a facility to migrate old files away from a production cluster. Access to those files from applications should continue to work transparently, without changing application co...
, 2014-07-18, 23:45
[HDFS-233] Support for snapshots
...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...
, 2014-07-18, 18:22
[HDFS-134] premature end-of-decommission of datanodes
...Decommissioning requires that the nodes be listed in the dfs.hosts.excludes file. The administrator runs the "dfsadmin -refreshNodes" command. The decommissioning process starts off. Suppose...
, 2014-07-18, 06:19
[HDFS-24] FSDataOutputStream should flush last partial CRC chunk
...The FSDataOutputSteam.flush() api is supposed to flush all data to the underlying stream. However, for LocalFileSystem, the flush APi does not flush the last partial CRC chunk.One solution i...
, 2014-07-17, 22:17
[HDFS-295] Update the "how to configure HDFS" documentation to include new features
...There has been lots of cases where HDFS administrators have enquired about setup and configuration of HDFS. A recent question asked about configuring Datanodes to understand the rack that it...
, 2014-07-17, 18:57
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