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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, 2015-04-24, 20:28
[HDFS-7993] Provide each Replica details in fsck - 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, 2015-04-21, 16:37
[HDFS-8025] Addendum fix for HDFS-3087 Decomissioning on NN restart can complete without blocks being replicated - HDFS - [issue]
...Per discussion with Andrew Wang on HDFS-7411, we should include HDFS-3087 and enhance the unit test....
http://issues.apache.org/jira/browse/HDFS-8025    Author: Ming Ma, 2015-04-13, 16:14
[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, 2015-04-13, 16:13
[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, 2015-04-04, 05:09
[HDFS-8056] Decommissioned dead nodes should continue to be counted as dead after NN restart - HDFS - [issue]
...We had some offline discussion with Andrew Wang and Colin Patrick McCabe about this. Bring this up for more input and get the patch in place.Dead nodes are tracked by DatanodeManager's datan...
http://issues.apache.org/jira/browse/HDFS-8056    Author: Ming Ma, 2015-04-04, 00:17
[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
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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