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[HDFS-744] Support hsync in HDFS - HDFS - [issue]
...HDFS-731 implements hsync by default as hflush. As descriibed in HADOOP-6313, the real expected semantics should be "flushes out to all replicas and all replicas have done posix fsync equiva...
http://issues.apache.org/jira/browse/HDFS-744    Author: Hairong Kuang, 2012-09-26, 19:09
[HDFS-2421] Improve the concurrency of  SerialNumberMap in NameNode - HDFS - [issue]
...After enabled permission checking in our HDFS test cluster, our benchmark observed a significant reduced concurrency in NameNode. Investigation showed that most threads were blocked at acqui...
http://issues.apache.org/jira/browse/HDFS-2421    Author: Hairong Kuang, 2012-08-18, 23:40
[HDFS-1435] Provide an option to store fsimage compressed - HDFS - [issue]
...Our HDFS has fsimage as big as 20G bytes. It consumes a lot of network bandwidth when secondary NN uploads a new fsimage to primary NN.If we could store fsimage compressed, the problem could...
http://issues.apache.org/jira/browse/HDFS-1435    Author: Hairong Kuang, 2012-07-09, 21:28
[HDFS-1614] Provide an option to saveNamespace to save namespace uncompressed - HDFS - [issue]
...With HDFS-1435, we can configure to store fsimage compressed. This jira aims to provide an option to saveNamespace command that stores the fsimage uncompressed regardless of the configuratio...
http://issues.apache.org/jira/browse/HDFS-1614    Author: Hairong Kuang, 2012-07-09, 21:28
[HDFS-15] Rack replication policy can be violated for over replicated blocks - HDFS - [issue]
...HDFS replicas placement strategy guarantees that the replicas of a block exist on at least two racks when its replication factor is greater than one. But fsck still reports that the replicas...
http://issues.apache.org/jira/browse/HDFS-15    Author: Hairong Kuang, 2012-04-12, 06:27
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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