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[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, 2014-07-18, 18:22
[HDFS-134] premature end-of-decommission of datanodes - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-134    Author: dhruba borthakur, 2014-07-18, 06:19
[HDFS-24] FSDataOutputStream should flush last partial CRC chunk - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-24    Author: dhruba borthakur, 2014-07-17, 22:17
[HDFS-295] Update the "how to configure HDFS" documentation to include new features - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-295    Author: dhruba borthakur, 2014-07-17, 18:57
[HDFS-2699] Store data and checksums together in block file - HDFS - [issue]
...The current implementation of HDFS stores the data in one block file and the metadata(checksum) in another block file. This means that every read from HDFS actually consumes two disk iops, o...
http://issues.apache.org/jira/browse/HDFS-2699    Author: dhruba borthakur, 2014-04-17, 04:53
[HDFS-3544] Ability to use SimpleRegeratingCode to fix missing blocks - HDFS - [issue]
...ReedSolomon encoding (n, k) has n storage nodes and can tolerate n-k failures. Regenerating a block needs to access k blocks. This is a problem when n and k are large. Instead, we can use si...
http://issues.apache.org/jira/browse/HDFS-3544    Author: dhruba borthakur, 2014-01-20, 08:32
[HDFS-1605] Convert DFSInputStream synchronized sections to a ReadWrite lock - HDFS - [issue]
...Hbase does concurrent preads from multiple threads to different blocks of the same hdfs file. Each of these pread calls invoke DFSInputStream.getFileLength() and DFSInputStream.getBlockAt()....
http://issues.apache.org/jira/browse/HDFS-1605    Author: dhruba borthakur, 2013-12-13, 04:29
[HDFS-988] saveNamespace race can corrupt the edits log - HDFS - [issue]
...The adminstrator puts the namenode is safemode and then issues the savenamespace command. This can corrupt the edits log. The problem is that  when the NN enters safemode, there could s...
http://issues.apache.org/jira/browse/HDFS-988    Author: dhruba borthakur, 2013-07-12, 19:34
[HDFS-1539] prevent data loss when a cluster suffers a power loss - HDFS - [issue]
...we have seen an instance where a external outage caused many datanodes to reboot at around the same time.  This resulted in many corrupted blocks. These were recently written blocks; th...
http://issues.apache.org/jira/browse/HDFS-1539    Author: dhruba borthakur, 2013-07-02, 13:42
[HDFS-1438] Expose getCorruptFiles APi via the FileSystem API - HDFS - [issue]
...HDFS-1111 proposed that the getCorruptFiles API be exposed via the DistributedFileSystem API. Details here http://goo.gl/IHL5...
http://issues.apache.org/jira/browse/HDFS-1438    Author: dhruba borthakur, 2013-05-25, 14:27
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