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[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...The Configurations section is no longer valid.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-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, 2014-11-03, 22:53
[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
[HDFS-6584] Support Archival Storage - HDFS - [issue]
...In most of the Hadoop clusters, as more and more data is stored for longer time, the demand for storage is outstripping the compute. Hadoop needs a cost effective and easy to manage solution...
http://issues.apache.org/jira/browse/HDFS-6584    Author: Tsz Wo Nicholas Sze, 2014-10-29, 19:54
[HDFS-7302] namenode -rollingUpgrade downgrade may finalize a rolling upgrade - HDFS - [issue]
...The namenode startup option "-rollingUpgrade downgrade" is originally designed for downgrading cluster.  However, running "namenode -rollingUpgrade downgrade" with the new software coul...
http://issues.apache.org/jira/browse/HDFS-7302    Author: Tsz Wo Nicholas Sze, 2014-10-28, 20:12
[HDFS-7260] Make DFSOutputStream.MAX_PACKETS configurable - HDFS - [issue]
...DFSOutputStream.MAX_PACKETS is hard coded to 80.  In some case, a smaller value is preferred for reducing memory usage.   Let's make it configurable....
http://issues.apache.org/jira/browse/HDFS-7260    Author: Tsz Wo Nicholas Sze, 2014-10-22, 01:15
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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