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[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, 2015-04-11, 00:07
[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, 2015-03-13, 23:43
[HDFS-503] Implement erasure coding as a layer on HDFS - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-503    Author: dhruba borthakur, 2014-11-25, 06:14
[HDFS-695] RaidNode should read in configuration from hdfs-site.xml - HDFS - [issue]
...The RaidNode currently reads in the configuration from hadoop-*.xml. It should read in its config parameters from hdfs-site.xml as well....
http://issues.apache.org/jira/browse/HDFS-695    Author: dhruba borthakur, 2014-08-28, 16:54
[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, 2014-08-15, 06:41
[HDFS-1366] reduce namenode startup time by optimising checkBlockInfo while loading  fsimage - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-1366    Author: dhruba borthakur, 2014-07-31, 00:48
[HDFS-1179] Implement a file change log - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-1179    Author: dhruba borthakur, 2014-07-30, 20:48
[HDFS-1094] Intelligent block placement policy to decrease probability of block loss - HDFS - [issue]
...The current HDFS implementation specifies that the first replica is local and the other two replicas are on any two random nodes on a random remote rack. This means that if any three datanod...
http://issues.apache.org/jira/browse/HDFS-1094    Author: dhruba borthakur, 2014-07-30, 18:42
[HDFS-385] Design a pluggable interface to place replicas of blocks in HDFS - HDFS - [issue]
...The current HDFS code typically places one replica on local rack, the second replica on remote random rack and the third replica on a random node of that remote rack. This algorithm is baked...
http://issues.apache.org/jira/browse/HDFS-385    Author: dhruba borthakur, 2014-07-30, 18:42
[HDFS-289] HDFS should blacklist datanodes that are not performing well - HDFS - [issue]
...On a large cluster, a few datanodes could be under-performing. There were cases when the network connectivity of a few of these bad datanodes were degraded, resulting in long long times (in ...
http://issues.apache.org/jira/browse/HDFS-289    Author: dhruba borthakur, 2014-07-30, 09:09
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB