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[HDFS-7993] Incorrect descriptions in fsck when nodes are decommissioned - HDFS - [issue]
...When you run fsck with "-files" or "-racks", you will get something like below if one of the replicas is decommissioned.blk_x len=y repl=3 [dn1, dn2, dn3, dn4]That is because in NamenodeFsck...
http://issues.apache.org/jira/browse/HDFS-7993    Author: Ming Ma, 2015-03-27, 00:21
[HDFS-7877] Support maintenance state for datanodes - HDFS - [issue]
...This requirement came up during the design for HDFS-7541. Given this feature is mostly independent of upgrade domain feature, it is better to track it under a separate jira. The design and d...
http://issues.apache.org/jira/browse/HDFS-7877    Author: Ming Ma, 2015-03-25, 04:59
[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, 2015-03-19, 03:31
[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, 2015-03-12, 16:12
[HDFS-7541] Upgrade Domains in HDFS - HDFS - [issue]
...Current HDFS DN rolling upgrade step requires sequential DN restart to minimize the impact on data availability and read/write operations. The side effect is longer upgrade duration for larg...
http://issues.apache.org/jira/browse/HDFS-7541    Author: Ming Ma, 2015-03-04, 00:48
[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-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
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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