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[HDFS-1348] Improve NameNode reponsiveness while it is checking if datanode decommissions are complete - HDFS - [issue]
...NameNode normally is busy all the time. Its log is full of activities every second. But once for a while, NameNode seems to pause for more than 10 seconds without doing anything, leaving a b...
http://issues.apache.org/jira/browse/HDFS-1348    Author: Hairong Kuang, 2015-03-02, 22:39
[HDFS-583] HDFS should enforce a max block size - HDFS - [issue]
...When DataNode creates a replica, it should enforce a max block size, so clients can't go crazy. One way of enforcing this is to make BlockWritesStreams to be filter steams that check the blo...
http://issues.apache.org/jira/browse/HDFS-583    Author: Hairong Kuang, 2014-07-25, 19:02
[HDFS-275] FSNamesystem should have an InvalidateBlockMap class to manage blocks scheduled to remove - HDFS - [issue]
...This jira intends to move the code that handles recentInvalideSet to a separate class InvalidateBlockMap....
http://issues.apache.org/jira/browse/HDFS-275    Author: Hairong Kuang, 2014-07-21, 19:00
[HDFS-166] NameNode#invalidateBlock's requirement on more than 1 valid replica exists before scheduling a replica to delete is too strict - HDFS - [issue]
...Currently invalideBlock does not allow to delete a replica only if at least two valid replicas exist before deletion is scheduled. This is too restrictive if the replica to delete is a corru...
http://issues.apache.org/jira/browse/HDFS-166    Author: Hairong Kuang, 2014-07-21, 18:35
[HDFS-48] NN should check a block's length even if the block is not a new block when processing a blockreport - HDFS - [issue]
...If the block length does not match the one in the blockMap, we should mark the block as corrupted. This could help clearing the polluted replicas caused by HADOOP-4810 and also help detect t...
http://issues.apache.org/jira/browse/HDFS-48    Author: Hairong Kuang, 2014-07-21, 18:13
[HDFS-365] IPC server should not hold a client's response queue lock while writing response back to a client - HDFS - [issue]
...Currently the IPC server holds a client's response queue lock while writing response back to a client. This unnecessary held lock prevents handlers from queuing a reply to the response queue...
http://issues.apache.org/jira/browse/HDFS-365    Author: Hairong Kuang, 2014-07-18, 21:54
[HDFS-32] testFilePermissions in TestDFSShell should shut down the mini dfs cluster when there is an error - HDFS - [issue]
...The unit test testFilePermissions only shuts down the cluster when there is no exception thrown. Should do so in a "finally" statement so the cluster gets shut down when there is an exceptio...
http://issues.apache.org/jira/browse/HDFS-32    Author: Hairong Kuang, 2014-07-17, 20:41
[HDFS-742] A down DataNode makes Balancer to hang on repeatingly asking NameNode its partial block list - HDFS - [issue]
...We had a balancer that had not made any progress for a long time. It turned out it was repeatingly asking Namenode for a partial block list of one datanode, which was done while the balancer...
http://issues.apache.org/jira/browse/HDFS-742    Author: Hairong Kuang, 2014-06-10, 16:57
[HDFS-1766] Datanode is marked dead, but datanode process is alive and verifying blocks - HDFS - [issue]
...We have a datanode marked dead in the namenode, and it is not taking any traffic. But it is verifying blocks continuously, so the DataNode process is definitely not dead. Jstack shows that t...
http://issues.apache.org/jira/browse/HDFS-1766    Author: Hairong Kuang, 2014-04-03, 03:29
[HDFS-372] DataNode should reuse delBlockFromDisk - HDFS - [issue]
...FSDataSet should reuse delBlcokFromDisk where it should/can be used like in invalidateBlock....
http://issues.apache.org/jira/browse/HDFS-372    Author: Hairong Kuang, 2014-02-04, 00:46
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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