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[HDFS-7397] The conf key "dfs.client.read.shortcircuit.streams.cache.size" is misleading - HDFS - [issue]
...For dfs.client.read.shortcircuit.streams.cache.size, is it in MB or KB?  Interestingly, it is neither in MB nor KB.  It is the number of shortcircuit streams....
http://issues.apache.org/jira/browse/HDFS-7397    Author: Tsz Wo Nicholas Sze, 2015-04-27, 17:15
[HDFS-8214] Secondary NN Web UI shows wrong date for Last Checkpoint - HDFS - [issue]
...SecondaryNamenode is using Time.monotonicNow() to display Last Checkpoint in the web UI. This causes weird times, generally, just after the epoch, to be displayed....
http://issues.apache.org/jira/browse/HDFS-8214    Author: Charles Lamb, 2015-04-27, 17:13
[HDFS-5574] Remove buffer copy in BlockReader.skip - HDFS - [issue]
...BlockReaderLocal.skip and RemoteBlockReader.skip uses a temp buffer to read data to this buffer, it is not necessary....
http://issues.apache.org/jira/browse/HDFS-5574    Author: Binglin Chang, 2015-04-27, 16:14
[HDFS-7859] Erasure Coding: Persist EC schemas in NameNode - HDFS - [issue]
...In meetup discussion with Zhe Zhang and Jing Zhao, it's suggested that we persist EC schemas in NameNode centrally and reliably, so that EC zones can reference them by name efficiently....
http://issues.apache.org/jira/browse/HDFS-7859    Author: Kai Zheng, 2015-04-27, 15:49
[HDFS-7674] Adding metrics for Erasure Coding - HDFS - [issue]
...As the design (in HDFS-7285) indicates, erasure coding involves non-trivial impact and workload for NameNode, DataNode and client; it also allows configurable and pluggable erasure codec and...
http://issues.apache.org/jira/browse/HDFS-7674    Author: Kai Zheng, 2015-04-27, 13:57
[HDFS-8268] Port conflict log for data node server is not sufficient - HDFS - [issue]
...Data Node Server start up issue due to port conflict.The data node server port "dfs.datanode.http.address" conflict is not sufficient to  identify the reason of failure.The exception lo...
http://issues.apache.org/jira/browse/HDFS-8268    Author: Mohammad Shahid Khan, 2015-04-27, 13:49
[HDFS-7068] Support multiple block placement policies - HDFS - [issue]
...According to the code, the current implement of HDFS only supports one specific type of block placement policy, which is BlockPlacementPolicyDefault by default.The default policy is enough f...
http://issues.apache.org/jira/browse/HDFS-7068    Author: Zesheng Wu, 2015-04-27, 13:33
[HDFS-4894] Multiple Replica Placement Policies support in one HDFS cluster - HDFS - [issue]
...We should allow multiple BPPs co-existing on the same HDFS cluster for different purpose of data and different types of application, i.e. we should allow some old, infrequently accessed data...
http://issues.apache.org/jira/browse/HDFS-4894    Author: Junping Du, 2015-04-27, 13:33
[HDFS-7613] Block placement policy for erasure coding groups - HDFS - [issue]
...Blocks in an erasure coding group should be placed in different failure domains – different DataNodes at the minimum, and different racks ideally....
http://issues.apache.org/jira/browse/HDFS-7613    Author: Zhe Zhang, 2015-04-27, 13:30
[HDFS-8112] Enforce authorization policy to protect administration operations for EC zone and schemas - HDFS - [issue]
...We should allow to enforce authorization policy to protect administration operations for EC zone and schemas as such behaviors would impact too much for a system....
http://issues.apache.org/jira/browse/HDFS-8112    Author: Kai Zheng, 2015-04-27, 12:38
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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