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[HDFS-5170] BlockPlacementPolicyDefault uses the wrong classname when alerting to enable debug logging - HDFS - [issue]
...  private static final String enableDebugLogging =    "For more information, please enable DEBUG log level on "    + LOG.getClass().getName();This ins...
http://issues.apache.org/jira/browse/HDFS-5170    Author: Andrew Wang, 2013-09-09, 15:04
[HDFS-4596] Shutting down namenode during checkpointing can lead to md5sum error - HDFS - [issue]
...This is a really rare error that can hit if a NN shutdown happens during the checkpointing process.Checkpointing and restarting nominally looks like this: FSImage is written to a tmp file an...
http://issues.apache.org/jira/browse/HDFS-4596    Author: Andrew Wang, 2013-09-05, 09:22
[HDFS-5141] Add cache status information to datanode heartbeat - HDFS - [issue]
...We need to propagate the cache capacity and cache remaining from the datanode to the namenode to make appropriate caching decisions....
http://issues.apache.org/jira/browse/HDFS-5141    Author: Andrew Wang, 2013-09-04, 18:36
[HDFS-4825] webhdfs / httpfs tests broken because of min block size change - HDFS - [issue]
...As reported by Suresh on HDFS-4305, some of the webhdfs tests were broken by the min block size change.Running org.apache.hadoop.fs.http.client.TestHttpFSFileSystemLocalFileSystemTests run: ...
http://issues.apache.org/jira/browse/HDFS-4825    Author: Andrew Wang, 2013-08-27, 23:08
Re: hsync is too slower than hflush - HDFS - [mail # dev]
...It's syncing the checksum file, so the disk head very likely has to move. There are rotational seek delays too.   On Mon, Aug 26, 2013 at 7:30 AM, lei liu  wrote:  ...
   Author: Andrew Wang, 2013-08-26, 17:44
Re: Secure deletion of blocks - HDFS - [mail # dev]
...Hi Matt,  Here are some code pointers:  - When doing a file deletion, the NameNode turns the file into a set of blocks that need to be deleted. - When datanodes heartbeat in to the...
   Author: Andrew Wang, 2013-08-15, 18:50
Re: Feature request to provide DFSInputStream subclassing mechanism - HDFS - [mail # dev]
...Blocks are supposed to be an internal abstraction within HDFS, and aren't an inherent part of FileSystem (the user-visible class used to access all Hadoop filesystems).  Is it possible ...
   Author: Andrew Wang, 2013-08-08, 02:47
[HDFS-4765] Permission check of symlink deletion incorrectly throws UnresolvedLinkException - HDFS - [issue]
...With permissions enabled, the permission check in FSNamesystem#delete will incorrectly throw an UnresolvedLinkException if the path contains a symlink. This leads to FileContext resolving th...
http://issues.apache.org/jira/browse/HDFS-4765    Author: Andrew Wang, 2013-08-05, 17:56
[HDFS-5034] Remove debug prints from getFileLinkInfo - HDFS - [issue]
...Couple debug prints were left in hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java from the initial symlinks i...
http://issues.apache.org/jira/browse/HDFS-5034    Author: Andrew Wang, 2013-07-26, 20:22
[HDFS-4851] Deadlock in pipeline recovery - HDFS - [issue]
...Here's a deadlock scenario that cropped up during pipeline recovery, debugged through jstacks. Todd tipped me off to this one. Pipeline fails, client initiates recovery. We have the old left...
http://issues.apache.org/jira/browse/HDFS-4851    Author: Andrew Wang, 2013-07-26, 07:39
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