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[HDFS-2006] ability to support storing extended attributes per file - HDFS - [issue]
...It would be nice if HDFS provides a feature to store extended attributes for files, similar to the one described here: http://en.wikipedia.org/wiki/Extended_file_attributes. The challenge is...
http://issues.apache.org/jira/browse/HDFS-2006    Author: dhruba borthakur, 2014-04-22, 18:48
[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
[HDFS-252] Export the HDFS file system through a NFS protocol - HDFS - [issue]
...It would be nice if can expose the HDFS filesystem using the NFS protocol.There are a couple of options that I could find:1. Use a user space C-language-implementation of a NFS server and th...
http://issues.apache.org/jira/browse/HDFS-252    Author: dhruba borthakur, 2013-04-25, 04:11
[HDFS-487] HDFS should expose a fileid to uniquely identify a file - HDFS - [issue]
...HDFS should expose a id that uniquely identifies a file. This helps in developing  applications that work correctly even when files are moved from one directory to another. A typical us...
http://issues.apache.org/jira/browse/HDFS-487    Author: dhruba borthakur, 2013-04-19, 23:27
[HDFS-1783] Ability for HDFS client to write replicas in parallel - HDFS - [issue]
...The current implementation of HDFS pipelines the writes to the three replicas. This introduces some latency for realtime latency sensitive applications. An alternate implementation that allo...
http://issues.apache.org/jira/browse/HDFS-1783    Author: dhruba borthakur, 2013-03-06, 19:40
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