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[HDFS-6731] Run "hdfs zkfc-formatZK" on a server in a non-namenode  will cause a null pointer exception. - HDFS - [issue]
...Run "hdfs zkfc-formatZK" on a server in a non-namenode  will cause a null pointer exception.[hadoop@test bin]$ ./hdfs zkfc -formatZKException in thread "main" java.lang.NullPointerExcep...
http://issues.apache.org/jira/browse/HDFS-6731    Author: WenJin Ma, 2014-07-23, 15:58
[HDFS-4450] Duplicate data node on the name node after formatting data node - HDFS - [issue]
...Duplicate data node on the name node after formatting data node。When we registered data node,use nodeReg.getXferPort() to find DatanodeDescriptor. DatanodeDescriptor nodeN = host2Datano...
http://issues.apache.org/jira/browse/HDFS-4450    Author: WenJin Ma, 2013-08-13, 14:12
[HDFS-4515] ReplicaMap thread-safe synchronization lead to a large number of threads blocking - HDFS - [issue]
...1.I use programs simulate 3000 users to write 100K small files in HDFS。(3 datanodes)2.Found that after a period of time the client and datanodes a lot of timeout errors or errors caused by t...
http://issues.apache.org/jira/browse/HDFS-4515    Author: WenJin Ma, 2013-02-20, 10:57
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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