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[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-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, 2014-12-01, 03:11
[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, 2014-11-25, 10:16
[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-7397] The conf key "dfs.client.read.shortcircuit.streams.cache.size" is misleading - HDFS - [issue]
...For dfs.client.read.shortcircuit.streams.cache.size, is it in MB or KB?  Interestingly, it is neither in MB nor KB.  It is the number of shortcircuit streams....
http://issues.apache.org/jira/browse/HDFS-7397    Author: Tsz Wo Nicholas Sze, 2014-11-14, 02:05
[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
[HDFS-2206] Add read-write lock to DatanodeManager - HDFS - [issue]
http://issues.apache.org/jira/browse/HDFS-2206    Author: Tsz Wo Nicholas Sze, 2014-11-13, 22:19
[HDFS-7276] Limit the number of byte arrays used by DFSOutputStream - HDFS - [issue]
...When there are a lot of DFSOutputStream's writing concurrently, the number of outstanding packets could be large.  The byte arrays created by those packets could occupy a lot of memory....
http://issues.apache.org/jira/browse/HDFS-7276    Author: Tsz Wo Nicholas Sze, 2014-11-13, 21:02
[HDFS-1681] Federation: support per pool and per node policies in Balancer - HDFS - [issue]
...Change balancer to support per pool and per node policies.per Node: Cluster is balance if each node is balance.per Pool: Cluster is balance if each pool is balance.Note that per Pool implies...
http://issues.apache.org/jira/browse/HDFS-1681    Author: Tsz Wo Nicholas Sze, 2014-11-12, 02:14
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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