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[HDFS-7388] Improve the log for HA failover - HDFS - [issue]
...Currently to debug an issue during the NN HA failover (with automatic failover setup), we usually need to check log from all the NN and ZKFC daemons to figure out what triggered the failover...
http://issues.apache.org/jira/browse/HDFS-7388    Author: Jing Zhao, 2014-11-10, 23:32
[HDFS-7228] Add an SSD policy into the default BlockStoragePolicySuite - HDFS - [issue]
...Currently in the default BlockStoragePolicySuite, we've defined 4 storage policies: LAZY_PERSIST, HOT, WARM, and COLD. Since we have already defined the SSD storage type, it will be useful t...
http://issues.apache.org/jira/browse/HDFS-7228    Author: Jing Zhao, 2014-10-29, 06:44
Re: Thinking ahead to hadoop-2.6 - HDFS - [mail # dev]
...Just to give a quick update about the current status of HDFS-6584 (archivalstorage). So far after HDFS-7081 got committed this morning, the mainfunctionalities have already been finished. As...
   Author: Jing Zhao, 2014-09-25, 01:19
Re: [VOTE] Merge HDFS-6581 to trunk - Writing to replicas in memory. - HDFS - [mail # dev]
...+1. This is a very useful feature and the performance number looksconvincing.Thanks,-JingOn Tue, Sep 23, 2014 at 5:12 PM, Xiaoyu Yao  wrote:CONFIDENTIALITY NOTICENOTICE: This message is...
   Author: Jing Zhao, 2014-09-24, 00:28
[HDFS-6996] SnapshotDiff report can hit IndexOutOfBoundsException when there are nested renamed directory/file - HDFS - [issue]
...Currently when computing snapshot diff report where a renamed file/directory is involved, we scan the withNameList inside of the corresponding WithCount node to identify the correct rename t...
http://issues.apache.org/jira/browse/HDFS-6996    Author: Jing Zhao, 2014-09-05, 14:47
[HDFS-6876] Archival Storage: support set/get storage policy in DFSAdmin - HDFS - [issue]
...We need to have DFSAdmin commands to manually set/get the storage policy of a file/directory....
http://issues.apache.org/jira/browse/HDFS-6876    Author: Jing Zhao, 2014-09-05, 04:16
[HDFS-6961] Archival Storage: BlockPlacementPolicy#chooseTarget should check each valid storage type in each choosing round - HDFS - [issue]
...Currently in each choosing round of BlockPlacementPolicy#chooseTarget (e.g., round 1 for choosing local storage, round 2 for remote rack, etc.), we only take into account the first storage t...
http://issues.apache.org/jira/browse/HDFS-6961    Author: Jing Zhao, 2014-09-04, 22:23
[HDFS-6609] Use DirectorySnapshottableFeature to represent a snapshottable directory - HDFS - [issue]
...Currently we use INodeDirectorySnapshottable to represent a snapshottable directory. When we set a directory to snapshottable, we also need to replace the corresponding INode. It will be bet...
http://issues.apache.org/jira/browse/HDFS-6609    Author: Jing Zhao, 2014-09-04, 07:16
[HDFS-5554] Add Snapshot Feature to INodeFile - HDFS - [issue]
...Similar with HDFS-5285, we can add a FileWithSnapshot feature to INodeFile and use it to replace the current INodeFileWithSnapshot....
http://issues.apache.org/jira/browse/HDFS-5554    Author: Jing Zhao, 2014-09-04, 02:15
[HDFS-5715] Use Snapshot ID to indicate the corresponding Snapshot for a FileDiff/DirectoryDiff - HDFS - [issue]
...Currently FileDiff and DirectoryDiff both contain a snapshot object reference to indicate its associated snapshot. Instead, we can simply record the corresponding snapshot id there. This can...
http://issues.apache.org/jira/browse/HDFS-5715    Author: Jing Zhao, 2014-09-04, 02:15
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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