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[HDFS-2887] Define a FSVolume interface - HDFS - [issue]
...FSVolume is an inner class in FSDataset.  It is actually a part of the implementation of FSDatasetInterface.  It is better to define a new interface, namely FSVolumeInterface, to c...
http://issues.apache.org/jira/browse/HDFS-2887    Author: Tsz Wo, 2013-08-14, 05:08
[HDFS-5017] Extends LightWeightGSet to support eviction of expired elements - HDFS - [issue]
...We extends LightWeightGSet to support eviction of expired elements so that namenode could use it as the RetryCache....
http://issues.apache.org/jira/browse/HDFS-5017    Author: Tsz Wo, 2013-07-23, 00:47
[HDFS-4908] Reduce snapshot inode memory usage - HDFS - [issue]
...Snapshots currently use INodeFile and INodeDirectory for storing previous file/dir states as snapshot inodes.  However, INodeFile and INodeDirectory have some fields not used by snapsho...
http://issues.apache.org/jira/browse/HDFS-4908    Author: Tsz Wo, 2013-07-11, 15:09
[HDFS-4914] When possible, Use DFSClient.Conf instead of Configuration - HDFS - [issue]
...In DFSClient and the related classes, we should use DFSClient.Conf instead of Configuration....
http://issues.apache.org/jira/browse/HDFS-4914    Author: Tsz Wo, 2013-06-20, 15:07
[HDFS-4875] Add a test for testing snapshot file length - HDFS - [issue]
...Here is a test idea from Suresh: A file was length x at the time of snapshot (say s1) creation Later y bytes get added to the file through appendWhen client gets block locations for the file...
http://issues.apache.org/jira/browse/HDFS-4875    Author: Tsz Wo, 2013-06-18, 15:07
[HDFS-4819] Update Snapshot doc for HDFS-4758 - HDFS - [issue]
...Update Snapshot doc to clarify that nested snapshots are not allowed....
http://issues.apache.org/jira/browse/HDFS-4819    Author: Tsz Wo, 2013-06-13, 19:04
[HDFS-3960] Snapshot of Being Written Files - HDFS - [issue]
...Here is a design question: Suppose there is a being written file when a snapshot is being taken.  What should the length of the file be shown in the snapshot?  In other words, how ...
http://issues.apache.org/jira/browse/HDFS-3960    Author: Tsz Wo, 2013-06-13, 00:21
[HDFS-4876] The javadoc of FileWithSnapshot is incorrect - HDFS - [issue]
...The javadoc said that snapshot files and the original file form a circular linked list.  It is no longer true....
http://issues.apache.org/jira/browse/HDFS-4876    Author: Tsz Wo, 2013-06-08, 01:00
[HDFS-4234] Use the generic code for choosing datanode in Balancer - HDFS - [issue]
...HDFS-3495 added some generic code for choosing datanodes with NodeGroup topology in Balancer.  We should reuse the code for choosing datanodes with racks....
http://issues.apache.org/jira/browse/HDFS-4234    Author: Tsz Wo, 2013-06-03, 06:39
[HDFS-4534] Update rename for snapshots - HDFS - [issue]
...With rename, an inode may be moved from one location to another location in the namespace tree.  We need to take care the case that the inode is also in some snapshots....
http://issues.apache.org/jira/browse/HDFS-4534    Author: Tsz Wo, 2013-05-22, 23:12
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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