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[HDFS-2465] Add HDFS support for fadvise readahead and drop-behind - HDFS - [issue]
...This is the HDFS side of HADOOP-7714. The initial implementation is heuristic based and should be considered experimental, as discussed in the parent JIRA. It should be off by default until ...
http://issues.apache.org/jira/browse/HDFS-2465    Author: Todd Lipcon, 2012-11-13, 03:36
[HDFS-3455] Add docs for NameNode initializeSharedEdits and bootstrapStandby commands - HDFS - [issue]
...We've made the HA setup easier by adding new flags to the namenode to automatically set up the standby. But, we didn't document them yet. We should amend the HDFSHighAvailability.apt.vm docs...
http://issues.apache.org/jira/browse/HDFS-3455    Author: Todd Lipcon, 2012-11-08, 21:02
[HDFS-2824] HA: failover does not succeed if prior NN died just after creating an edit log segment - HDFS - [issue]
...In stress testing failover, I had the following failure: NN1 rolls edit logs and starts writing edits_inprogress_1000 NN1 crashes before writing the START_LOG_SEGMENT transaction NN2 tries t...
http://issues.apache.org/jira/browse/HDFS-2824    Author: Todd Lipcon, 2012-11-02, 23:06
[HDFS-4135] Add method to DFSOutputStream to dump pipeline status - HDFS - [issue]
...Occasionally higher-level apps (like HBase) will detect that an outputstream is acting slower than usual. It would be nice to be able to log a WARN message which contains the current state o...
http://issues.apache.org/jira/browse/HDFS-4135    Author: Todd Lipcon, 2012-11-01, 17:06
Re: HDFS HA with HDFS Federation - HDFS - [mail # dev]
...Hi Lohit,  The shared edits dir config is also optionally per-namenode -- i.e you can specify dfs.namenode.shared.edits.dir.namespace1 or even dfs.namenode.shared.edits.dir.namespace1.n...
   Author: Todd Lipcon, 2012-10-31, 20:10
[HDFS-3573] Supply NamespaceInfo when instantiating JournalManagers - HDFS - [issue]
...Currently, the JournalManagers are instantiated before the NamespaceInfo is loaded from local storage directories. This is problematic since the JM may want to verify that the storage info a...
http://issues.apache.org/jira/browse/HDFS-3573    Author: Todd Lipcon, 2012-10-31, 14:01
[HDFS-3695] Genericize format() to non-file JournalManagers - HDFS - [issue]
...Currently, the "namenode -format" and "namenode -initializeSharedEdits" commands do not understand how to do anything with non-file-based shared storage. This affects both BookKeeperJournalM...
http://issues.apache.org/jira/browse/HDFS-3695    Author: Todd Lipcon, 2012-10-31, 14:01
Re: Running Application (YARN) on top of federated NameNode - HDFS - [mail # dev]
...Hi Lohit,  There are basically three main options here:  1) Symlinks. As you suggested, you could have one of the namespaces have top-levels cross-filesystem symlinks to the other ...
   Author: Todd Lipcon, 2012-10-29, 23:21
[expand - 1 more] - Re: Status of CheckpointNode and BackupNode - HDFS - [mail # dev]
...It's been 10 days or so: Eli, do you want to file a JIRA to remove this code?  Do we need to call a vote of any kind, or is this treated as a code change where the normal processes appl...
   Author: Todd Lipcon, 2012-10-26, 14:39
[expand - 1 more] - Re: need some help understanding NN quorum edit log - HDFS - [mail # dev]
...Yep, that's right.  -Todd  On Wed, Oct 24, 2012 at 4:58 PM, Sujee Maniyam  wrote:     Todd Lipcon Software Engineer, Cloudera...
   Author: Todd Lipcon, 2012-10-25, 00:55
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