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[HDFS-7314] Aborted DFSClient's impact on long running service like YARN - HDFS - [issue]
...It happened in YARN nodemanger scenario. But it could happen to any long running service that use cached instance of DistrbutedFileSystem.1. Active NN is under heavy load. So it became unava...
http://issues.apache.org/jira/browse/HDFS-7314    Author: Ming Ma, 2014-11-20, 18:06
[HDFS-7401] Add block info to DFSInputStream' WARN message when it adds node to deadNodes - HDFS - [issue]
...Block info is missing in the below message2014-11-14 03:59:00,386 WARN org.apache.hadoop.hdfs.DFSClient: Failed to connect to /xx.xx.xx.xxx:50010 for block, add to deadNodes and continue. ja...
http://issues.apache.org/jira/browse/HDFS-7401    Author: Ming Ma, 2014-11-17, 23:15
[HDFS-7400] More reliable namenode health check to detect OS/HW issues - HDFS - [issue]
...We had this scenario on an active NN machine. Disk array controller firmware has a bug. So disks stop working. ZKFC and NN still considered the node healthy; Communications between ZKFC and ...
http://issues.apache.org/jira/browse/HDFS-7400    Author: Ming Ma, 2014-11-17, 08:26
[HDFS-7128] Decommission slows way down when it gets towards the end - HDFS - [issue]
...When we decommission nodes across different racks, the decommission process becomes really slow at the end, hardly making any progress. The problem is some blocks are on 3 decomm-in-progress...
http://issues.apache.org/jira/browse/HDFS-7128    Author: Ming Ma, 2014-11-07, 07:01
[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, 2014-11-06, 18:42
[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, 2014-11-04, 20:25
[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, 2014-10-30, 00:05
[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
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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