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[HDFS-6178] Decommission on standby NN couldn't finish - HDFS - [issue]
...Currently decommissioning machines in HA-enabled cluster requires running refreshNodes in both active and standby nodes. Sometimes decommissioning won't finish from standby NN's point of vie...
http://issues.apache.org/jira/browse/HDFS-6178    Author: Ming Ma, 2014-04-10, 00:06
[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, 2014-04-09, 20:11
[HDFS-6184] Better health check from ZKFC - 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, 2014-04-02, 23:41
[HDFS-5757] Decommisson lots of nodes at the same time could slow down NN - HDFS - [issue]
...Sometimes we need to decomm a whole rack of nodes at the same time. When the decomm is in process; NN is slow.The reason is when DecommissionManager checks the decomm status, it acquires nam...
http://issues.apache.org/jira/browse/HDFS-5757    Author: Ming Ma, 2014-01-10, 19:50
[HDFS-5639] rpc scheduler abstraction - HDFS - [issue]
...We have run into various issues in namenode and hbase w.r.t. rpc handling in multi-tenant clusters. The examples arehttps://issues.apache.org/jira/i#browse/HADOOP-9640 https://issues.ap...
http://issues.apache.org/jira/browse/HDFS-5639    Author: Ming Ma, 2013-12-09, 22:07
[HDFS-3655] Datanode recoverRbw could hang sometime - HDFS - [issue]
...This bug seems to apply to 0.22 and hadoop 2.0. I will upload the initial fix done by my colleague Xiaobo Peng shortly ( there is some logistics issue being worked on so that he can upload p...
http://issues.apache.org/jira/browse/HDFS-3655    Author: Ming Ma, 2013-08-13, 14:48
[HDFS-3998] Speed up fsck - HDFS - [issue]
...We have some big clusters. Sometimes we want to find out the list of missing blocks or blocks with only one replica quickly. Currently fsck has to take a path as input and it then recursivel...
http://issues.apache.org/jira/browse/HDFS-3998    Author: Ming Ma, 2012-11-10, 23:34
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