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[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
[HDFS-2699] Store data and checksums together in block file
...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...
, 2014-04-17, 04:53
[HDFS-3544] Ability to use SimpleRegeratingCode to fix missing blocks
...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...
, 2014-01-20, 08:32
[HDFS-988] saveNamespace race can corrupt the edits log
...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...
, 2013-07-12, 19:34
[HDFS-1539] prevent data loss when a cluster suffers a power loss
...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...
, 2013-07-02, 13:42
[HDFS-1438] Expose getCorruptFiles APi via the FileSystem API
...HDFS-1111 proposed that the getCorruptFiles API be exposed via the DistributedFileSystem API. Details here http://goo.gl/IHL5...
, 2013-05-25, 14:27
[HDFS-252] Export the HDFS file system through a NFS protocol
...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...
, 2013-04-25, 04:11
[HDFS-976] Hot Standby for NameNode
...This is a place holder to share our code and experiences about implementing a Hot Standby for the HDFS NameNode for hadoop 0.20....
, 2013-02-08, 23:50
[HDFS-395] DFS Scalability: Incremental block reports
...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...
, 2013-02-01, 12:40
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