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[HDFS-6702] DFSClient should create blocks using StorageType - HDFS - [issue]
...When DFSClient asks NN for a new block (via addBlock), NN returns a LocatedBlock with storage type information.  However, DFSClient does not use StorageType to create blocks with DN. &n...
http://issues.apache.org/jira/browse/HDFS-6702    Author: Tsz Wo Nicholas Sze, 2015-01-21, 06:22
[HDFS-6685] Balancer should preserve storage type of replicas - HDFS - [issue]
...When Balancer moves replicas to balance the cluster, it should always move replicas from a storage with any type to another storage with the same type, i.e. it preserves storage type of repl...
http://issues.apache.org/jira/browse/HDFS-6685    Author: Tsz Wo Nicholas Sze, 2015-01-21, 06:15
[HDFS-7639] Remove the limitation imposed by dfs.balancer.moverThreads - HDFS - [issue]
...In Balancer/Mover, the number of dispatcher threads (dfs.balancer.moverThreads) limits the number of concurrent moves.  Each dispatcher thread sends request to a datanode and then is bl...
http://issues.apache.org/jira/browse/HDFS-7639    Author: Tsz Wo Nicholas Sze, 2015-01-20, 21:05
[HDFS-7323] Move the get/setStoragePolicy commands out from dfsadmin - HDFS - [issue]
...After HDFS-7093, setting storage policy no longer requires superuser privilege.  We should move the get/setStoragePolicy commands out from dfsadmin....
http://issues.apache.org/jira/browse/HDFS-7323    Author: Tsz Wo Nicholas Sze, 2015-01-20, 07:12
[HDFS-3154] Add a notion of immutable/mutable files - HDFS - [issue]
...The notion of immutable file is useful since it lets the system and tools optimize certain things as discussed in this email thread.  Also, many applications require only immutable file...
http://issues.apache.org/jira/browse/HDFS-3154    Author: Tsz Wo Nicholas Sze, 2015-01-20, 02:08
[HDFS-6633] Support reading new data in a being written file until the file is closed - HDFS - [issue]
...When a file is being written, the file length keeps increasing.  If the file is opened for read, the reader first gets the file length and then read only up to that length.  The re...
http://issues.apache.org/jira/browse/HDFS-6633    Author: Tsz Wo Nicholas Sze, 2014-12-30, 12:35
[HDFS-7396] Revisit synchronization in Namenode - HDFS - [issue]
...HDFS-2106 separated block management to a new package from namenode.  As part of it, some code was refactored to new classes such as DatanodeManager, HeartbeatManager, etc.  There ...
http://issues.apache.org/jira/browse/HDFS-7396    Author: Tsz Wo Nicholas Sze, 2014-12-06, 01:03
[HDFS-4107] Add utility methods to cast INode to INodeFile and INodeFileUnderConstruction - HDFS - [issue]
...In the namenode code, there are many individual routines checking whether an inode is null and whether it could be cast to INodeFile/INodeFileUnderConstruction.  Let's add utility metho...
http://issues.apache.org/jira/browse/HDFS-4107    Author: Tsz Wo Nicholas Sze, 2014-11-17, 08:56
[HDFS-7358] Clients may get stuck waiting when using ByteArrayManager - HDFS - [issue]
...stack reported that clients might get stuck waiting when using ByteArrayManager; see his comments....
http://issues.apache.org/jira/browse/HDFS-7358    Author: Tsz Wo Nicholas Sze, 2014-11-14, 15:25
[HDFS-2106] Umbrella JIRA for separating block management and name space management in NameNode - HDFS - [issue]
...Namenode has two main components, block management and namespace management.  The ultimate goal is to allow BM and NM running in separated servers.  The short-term goal is to separ...
http://issues.apache.org/jira/browse/HDFS-2106    Author: Tsz Wo Nicholas Sze, 2014-11-13, 22:22
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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