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[HDFS-12946] Add a tool to check rack configuration against EC policies - HDFS - [issue]
...From testing we have seen setups with problematic racks / datanodes that would not suffice basic EC usages. These are usually found out only after the tests failed.We should provide a way to...    Author: Xiao Chen , 2018-10-16, 04:08
[HDFS-13926] ThreadLocal aggregations for FileSystem.Statistics are incorrect with striped reads - HDFS - [issue]
...During some integration testing, Nihar Sheth found out that per-thread read stats for EC is incorrect. This is due to the striped reads are done asynchronously on the worker threads....    Author: Xiao Chen , 2018-10-10, 02:55
[HDFS-13655] RBF: Add missing ClientProtocol APIs to RBF - HDFS - [issue]
...As discussed with Íñigo Goiri, there are some HDFS methods that does not take path as a parameter. We should support these to work with federation.The ones missing are: Snapshots Storage pol...    Author: Xiao Chen , 2018-09-18, 18:48
[HDFS-13731] ReencryptionUpdater fails with ConcurrentModificationException during processCheckpoints - HDFS - [issue]
...HDFS-12837 fixed some flakiness of Reencryption related tests. But as Zsolt Venczel's comment, there are a few timeouts still. We should investigate that....    Author: Xiao Chen , 2018-08-28, 22:39
[HDFS-13847] Clean up ErasureCodingPolicyManager - HDFS - [issue]
...ErasureCodingPolicyManager class is declared as LimitedPrivate for HDFS.This doesn't seem to make sense, as I have checked all its usages are strictly within hadoop-hdfs project.According to...    Author: Xiao Chen , 2018-08-22, 16:34
[HDFS-13788] Update EC documentation about rack fault tolerance - HDFS - [issue]
...From rack fault-tolerance, it is also important to have at least as many racks as the configur...    Author: Xiao Chen , 2018-08-14, 19:41
[HDFS-13721] NPE in DataNode due to uninitialized DiskBalancer - HDFS - [issue]
...2018-06-28 05:11:47,650 ERROR org.apache.hadoop.jmx.JMXJsonServlet: getting attribute DiskBalancerStatus of Hadoop:service=DataNode,name=DataNodeInfo threw an    Author: Xiao Chen , 2018-08-10, 21:10
[HDFS-10320] Rack failures may result in NN terminate - HDFS - [issue]
...If there're rack failures which end up leaving only 1 rack available, BlockPlacementPolicyDefault#chooseRandom may get InvalidTopologyException when calling NetworkTopology#chooseRandom, whi...    Author: Xiao Chen , 2018-08-10, 14:39
[HDFS-13741] Cosmetic code improvement in XAttrFormat - HDFS - [issue]
...In an offline review, Daniel Templeton had a comment about the following code snippet.     static int toInt(XAttr.NameSpace namespace, String name) {      long xattr...    Author: Xiao Chen , 2018-07-27, 22:59
[HDFS-13682] Cannot create encryption zone after KMS auth token expires - HDFS - [issue]
...Our internal testing reported this behavior recently.[root@nightly6x-1 ~]# sudo -u hdfs /usr/bin/kinit -kt /cdep/keytabs/hdfs.keytab hdfs -l 30d -r 30d[root@nightly6x-1 ~]# sudo -u hdfs klis...    Author: Xiao Chen , 2018-06-24, 08:04