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[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
[HDFS-7383] DataNode.requestShortCircuitFdsForRead may throw NullPointerException - HDFS - [issue]
...java.lang.NullPointerException at org.apache.hadoop.hdfs.server.datanode.DataNode.requestShortCircuitFdsForRead(DataNode.java:1525) at org.apache.hadoop.hdfs.server.datanode.DataXceiver.requ...
http://issues.apache.org/jira/browse/HDFS-7383    Author: Tsz Wo Nicholas Sze, 2014-11-10, 15:17
[HDFS-7364] Balancer always shows zero Bytes Already Moved - HDFS - [issue]
...Here is an example:Time Stamp               Iteration#  Bytes Already Moved  Bytes Left To Move  Bytes Being MovedNov 5, 2014 5:23:38 PM &nb...
http://issues.apache.org/jira/browse/HDFS-7364    Author: Tsz Wo Nicholas Sze, 2014-11-07, 15:25
[HDFS-7357] FSNamesystem.checkFileProgress should log file path - HDFS - [issue]
...There is a log message in FSNamesystem.checkFileProgress for incomplete blocks.  However, the log message does not include the file path....
http://issues.apache.org/jira/browse/HDFS-7357    Author: Tsz Wo Nicholas Sze, 2014-11-06, 15:12
[HDFS-7147] Update archival storage user documentation - HDFS - [issue]
...The Configurations section is no longer valid.  It should be removed.Also, if there are new APIs able to get in such as the addStoragePolicy API proposed in HDFS-7076, the corresponding...
http://issues.apache.org/jira/browse/HDFS-7147    Author: Tsz Wo Nicholas Sze, 2014-11-04, 15:14
[HDFS-7321] Add a mechanism to clean up the free queue in ByteArrayManager - HDFS - [issue]
...ByteArrayManager is designed to limit the number of byte arrays allocated.  It also provide a mechanism for recycling arrays.  It uses a free queue to store the recycled arrays int...
http://issues.apache.org/jira/browse/HDFS-7321    Author: Tsz Wo Nicholas Sze, 2014-11-01, 20:18
[HDFS-7230] Add rolling downgrade documentation - HDFS - [issue]
...HDFS-5535 made a lot of improvement on rolling upgrade.  It also added the cluster downgrade feature.  However, the downgrade described in HDFS-5535 requires cluster downtime. &nbs...
http://issues.apache.org/jira/browse/HDFS-7230    Author: Tsz Wo Nicholas Sze, 2014-10-31, 15:15
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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