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[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-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
[HDFS-1108] Log newly allocated blocks
...The current HDFS design says that newly allocated blocks for a file are not persisted in the NN transaction log when the block is allocated. Instead, a hflush() or a close() on the file pers...
, 2012-12-03, 07:33
[HDFS-1031] Enhance the webUi to list a few of the corrupted files in HDFS
...The existing webUI displays something like this:WARNING : There are about 12 missing blocks. Please check the log or run fsck. It would be nice if we can display the filenames that have miss...
, 2012-11-10, 23:34
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