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[HDFS-7281] Missing block is marked as corrupted block - HDFS - [issue]
...In the situation where the block lost all its replicas, fsck shows the block is missing as well as corrupted. Perhaps it is better not to mark the block corrupted in this case. The reason it...
http://issues.apache.org/jira/browse/HDFS-7281    Author: Ming Ma, 2014-10-23, 02:51
[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, 2014-10-23, 00:44
[HDFS-7269] NN and DN don't check whether corrupted blocks reported by clients are actually corrupted - HDFS - [issue]
...We had a case where the client machine had memory issue and thus failed the checksum validation of a given block for all its replicas. So the client ended up informing NN about the corrupted...
http://issues.apache.org/jira/browse/HDFS-7269    Author: Ming Ma, 2014-10-21, 04:59
[HDFS-6744] Improve decommissioning nodes and dead nodes access on the new NN webUI - HDFS - [issue]
...The new NN webUI lists live node at the top of the page, followed by dead node and decommissioning node. From admins point of view:1. Decommissioning nodes and dead nodes are more interestin...
http://issues.apache.org/jira/browse/HDFS-6744    Author: Ming Ma, 2014-10-16, 19:39
[HDFS-7208] NN doesn't schedule replication when a DN storage fails - HDFS - [issue]
...We found the following problem. When a storage device on a DN fails, NN continues to believe replicas of those blocks on that storage are valid and doesn't schedule replication.A DN has 12 s...
http://issues.apache.org/jira/browse/HDFS-7208    Author: Ming Ma, 2014-10-16, 14:59
[HDFS-6943] Improve NN allocateBlock log to include replicas' datanode IPs - HDFS - [issue]
...Datanode storage ID used to use IP and port. It has changed to use UUID. This makes debugging harder when we want to understand which DNs are assigned when DFSClient calls addBlock. For exam...
http://issues.apache.org/jira/browse/HDFS-6943    Author: Ming Ma, 2014-10-16, 02:27
[HDFS-7009] Active NN and standby NN have different live nodes - HDFS - [issue]
...To follow up on https://issues.apache.org/jira/browse/HDFS-6478, in most cases, given DN sends HB and BR to NN regularly, if a specific RPC call fails, it isn't a big deal.However, there are...
http://issues.apache.org/jira/browse/HDFS-7009    Author: Ming Ma, 2014-09-06, 01:31
[HDFS-6184] Capture NN's thread dump when it fails over - HDFS - [issue]
...We have seen several false positives in terms of when ZKFC considers NN to be unhealthy. Some of these triggers unnecessary failover. Examples,1. SBN checkpoint caused ZKFC's RPC call into N...
http://issues.apache.org/jira/browse/HDFS-6184    Author: Ming Ma, 2014-08-26, 01:06
[HDFS-5693] Few NN metrics data points were collected via JMX when NN is under heavy load - HDFS - [issue]
...JMX sometimes doesn’t return any value when NN is under heavy load. However, that is when we would like to get metrics to help to diagnosis the issue.When NN is under heavy load due to bad a...
http://issues.apache.org/jira/browse/HDFS-5693    Author: Ming Ma, 2014-08-15, 06:41
[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, 2014-08-12, 01:31
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