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Colin Patrick McCabe
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[HDFS-350] DFSClient more robust if the namenode is busy doing GC
...In the current code, if the client (writer) encounters an RPC error while fetching a new block id from the namenode, it does not retry. It throws an exception to the application. This become...
, 2016-03-22, 21:30
[HDFS-1432] HDFS across data centers: HighTide
...There are many instances when the same piece of data resides on multiple HDFS clusters in different data centers. The primary reason being that the physical limitation of one data cent...
, 2015-09-15, 21:08
[HDFS-1605] Convert DFSInputStream synchronized sections to a ReadWrite lock
...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()....
, 2015-05-18, 12:17
[HDFS-487] HDFS should expose a fileid to uniquely identify a file
...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...
, 2015-04-11, 00:07
[HDFS-1783] Ability for HDFS client to write replicas in parallel
...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...
, 2015-03-13, 23:43
[HDFS-503] Implement erasure coding as a layer on HDFS
...The goal of this JIRA is to discuss how the cost of raw storage for a HDFS file system can be reduced. Keeping three copies of the same data is very costly, especially when the size of stora...
, 2014-11-25, 06:14
[HDFS-695] RaidNode should read in configuration from hdfs-site.xml
...The RaidNode currently reads in the configuration from hadoop-*.xml. It should read in its config parameters from hdfs-site.xml as well....
, 2014-08-28, 16:54
[HDFS-2006] ability to support storing extended attributes per file
...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...
, 2014-08-15, 06:41
[HDFS-1366] reduce namenode startup time by optimising checkBlockInfo while loading fsimage
...The namenode spends about 10 minutes reading in a 14 GB fsimage file into memory and creating all the in-memory data structures. A jstack based debugger clearly shows that most of the time d...
, 2014-07-31, 00:48
[HDFS-1179] Implement a file change log
...The File Change Log (FCL) is a construct that records all metadata changes in a file system (http://en.wikipedia.org/wiki/File_change_log). This JIRA is to discuss various high-level approac...
, 2014-07-30, 20:48
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