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[HDFS-6425] Large postponedMisreplicatedBlocks has impact on blockReport latency - HDFS - [issue]
...Sometimes we have large number of over replicates when NN fails over. When the new active NN took over, over replicated blocks will be put to postponedMisreplicatedBlocks until all DNs for t...
http://issues.apache.org/jira/browse/HDFS-6425    Author: Ming Ma, 2014-08-01, 23:57
[HDFS-6791] A block could remain under replicated if all of its replicas are on decommissioned nodes - HDFS - [issue]
...Here is the scenario.1. Normally before NN transitions a DN to decommissioned state, enough replicas have been copied to other "in service" DNs. However, in some rare situations, the cluster...
http://issues.apache.org/jira/browse/HDFS-6791    Author: Ming Ma, 2014-08-01, 04:56
[HDFS-6772] Get DNs out of blockContentsStale==true state faster when NN restarts - HDFS - [issue]
...Here is the non-HA scenario.1. Get HDFS into block-over-replicated situation.2. Restart the NN.3. From NN's point of view, DNs will remain in blockContentsStale==true state for a long time. ...
http://issues.apache.org/jira/browse/HDFS-6772    Author: Ming Ma, 2014-07-30, 21:49
[HDFS-6742] Support sorting datanode list on the new NN webUI - HDFS - [issue]
...The legacy webUI allows sorting datanode list based on specific column such as hostname. It is handy for admins can find pattern more quickly, especially for big clusters....
http://issues.apache.org/jira/browse/HDFS-6742    Author: Ming Ma, 2014-07-29, 16:44
[HDFS-6626] Node is marked decommissioned if it becomes dead when it is being decommissioned - HDFS - [issue]
...Not sure if it is by design. But it isn't intuitive. The scenario is like this, you try to decommission a node; when the node is being decommissioned, the node becomes dead from NN's point o...
http://issues.apache.org/jira/browse/HDFS-6626    Author: Ming Ma, 2014-07-29, 00:03
[HDFS-6743] Put IP address into a new column on the new NN webUI - HDFS - [issue]
...The new NN webUI combines hostname and IP into one column in datanode list. It is more convenient for admins if the IP address can be put to a separate column, as in the legacy NN webUI....
http://issues.apache.org/jira/browse/HDFS-6743    Author: Ming Ma, 2014-07-25, 19:26
[HDFS-6723] New NN webUI no longer displays decommissioned state for dead node - HDFS - [issue]
...Somehow the new webUI doesn't show if a given dead node is decommissioned or not. JMX does return the correct info. Perhaps some bug in dfshealth.html?...
http://issues.apache.org/jira/browse/HDFS-6723    Author: Ming Ma, 2014-07-25, 15:00
[HDFS-6747] Display the most recent GC info on NN webUI - HDFS - [issue]
...It will be handy if the recent GC information is available on NN webUI. admins don't need to dig out GC logs....
http://issues.apache.org/jira/browse/HDFS-6747    Author: Ming Ma, 2014-07-25, 08:45
[HDFS-6722] Display readable last contact time for dead nodes on NN webUI - HDFS - [issue]
...For dead node info on NN webUI, admins want to know when the nodes became dead, to troubleshoot missing block, etc. Currently the webUI displays the last contact as "the unit of seconds sinc...
http://issues.apache.org/jira/browse/HDFS-6722    Author: Ming Ma, 2014-07-25, 07:36
[HDFS-6746] Support datanode list pagination and filtering for big clusters on NN webUI - HDFS - [issue]
...This isn't a major issue yet. Still it might be good to add support for pagination at some point and maybe some filtering. For example, that is useful to filter out live nodes that belong to...
http://issues.apache.org/jira/browse/HDFS-6746    Author: Ming Ma, 2014-07-25, 07:35
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