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[HDFS-7439] Add BlockOpResponseProto's message to DFSClient's exception message - HDFS - [issue]
...When (BlockOpResponseProto#getStatus() != SUCCESS), it helps with debugging if DFSClient can add BlockOpResponseProto's message to the exception message applications will get. For example, i...
http://issues.apache.org/jira/browse/HDFS-7439    Author: Ming Ma, 2015-03-02, 15:38
[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, 2015-02-24, 15:21
[HDFS-7491] Add incremental blockreport latency to DN metrics - HDFS - [issue]
...In a busy cluster, IBR processing could be delayed due to NN FSNamesystem lock and cause NN to throw NotReplicatedYetException to DFSClient and thus increase the overall application latency....
http://issues.apache.org/jira/browse/HDFS-7491    Author: Ming Ma, 2015-02-21, 06:37
[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, 2015-02-09, 19:08
[HDFS-7725] Incorrect "nodes in service" metrics caused all writes to fail - HDFS - [issue]
...One of our clusters sometimes couldn't allocate blocks from any DNs. BlockPlacementPolicyDefault complains with the following messages for all DNs.the node is too busy (load:x > y)It turn...
http://issues.apache.org/jira/browse/HDFS-7725    Author: Ming Ma, 2015-02-02, 23:49
[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, 2015-01-29, 18:14
[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, 2015-01-23, 19:35
[HDFS-7182] JMX metrics aren't accessible when NN is busy - HDFS - [issue]
...HDFS-5693 has addressed all NN JMX metrics in hadoop 2.0.5. Since then couple new metrics have been added. It turns out "RollingUpgradeStatus" requires FSNamesystem read lock....
http://issues.apache.org/jira/browse/HDFS-7182    Author: Ming Ma, 2015-01-10, 15:27
[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, 2015-01-06, 03:31
[HDFS-7521] Refactor DN state management - HDFS - [issue]
...There are two aspects w.r.t. DN state management in NN. State machine management within active NNNN maintains states of each data node regarding whether it is running or being decommissioned...
http://issues.apache.org/jira/browse/HDFS-7521    Author: Ming Ma, 2014-12-23, 01:03
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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