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[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-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, 2014-10-31, 02:21
[HDFS-7308] DFSClient write packet size may > 64kB - HDFS - [issue]
...In DFSOutputStream.computePacketChunkSize(..),  private void computePacketChunkSize(int psize, int csize) {    final int chunkSize = csize + getChecksumSize(); ...
http://issues.apache.org/jira/browse/HDFS-7308    Author: Tsz Wo Nicholas Sze, 2014-10-29, 22:11
[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
[HDFS-7265] Use a throttler for replica write in datanode - HDFS - [issue]
...BlockReceiver process packets in BlockReceiver.receivePacket() as follows read from socket enqueue the ack write to downstream write to diskThe above steps is repeated for each packet in a s...
http://issues.apache.org/jira/browse/HDFS-7265    Author: Tsz Wo Nicholas Sze, 2014-10-20, 22:53
[HDFS-7264] Tha last datanode in a pipeline should send a heartbeat when there is no traffic - HDFS - [issue]
...When the client is writing slowly, the client will send a heartbeat to signal that the connection is still alive.  This case works fine.However, when a client is writing fast but some o...
http://issues.apache.org/jira/browse/HDFS-7264    Author: Tsz Wo Nicholas Sze, 2014-10-20, 20:52
[HDFS-7144] Fix findbugs warnings in RamDiskReplicaTracker - HDFS - [issue]
...Two more findbugs warnings: Bad practice Warningsorg.apache.hadoop.hdfs.server.datanode.fsdataset.impl.RamDiskReplicaTracker$RamDiskReplica.deleteSavedFiles() ignores exceptional return valu...
http://issues.apache.org/jira/browse/HDFS-7144    Author: Tsz Wo Nicholas Sze, 2014-10-18, 03:01
[HDFS-7143] Fix findbugs warnings in HDFS-6581 branch - HDFS - [issue]
...There are 4 findbugs warnings reported by Jenkins.https://builds.apache.org/job/PreCommit-HDFS-Build/8064/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html...
http://issues.apache.org/jira/browse/HDFS-7143    Author: Tsz Wo Nicholas Sze, 2014-10-18, 03:00
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