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[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
[HDFS-4025] QJM: Sychronize past log segments to JNs that missed them - HDFS - [issue]
...Currently, if a JournalManager crashes and misses some segment of logs, and then comes back, it will be re-added as a valid part of the quorum on the next log roll. However, it will not have...
http://issues.apache.org/jira/browse/HDFS-4025    Author: Todd Lipcon, 2012-10-19, 18:52
[HDFS-2872] Add sanity checks during edits loading that generation stamps are non-decreasing - HDFS - [issue]
...In 0.23 and later versions, we have a txid per edit, and the loading process verifies that there are no gaps. Lacking this in 1.0, we can use generation stamps as a proxy - the OP_SET_GENERA...
http://issues.apache.org/jira/browse/HDFS-2872    Author: Todd Lipcon, 2012-10-17, 19:27
[HDFS-2877] If locking of a storage dir fails, it will remove the other NN's lock file on exit - HDFS - [issue]
...In Storage.tryLock(), we call lockF.deleteOnExit() regardless of whether we successfully lock the directory. So, if another NN has the directory locked, then we'll fail to lock it the first ...
http://issues.apache.org/jira/browse/HDFS-2877    Author: Todd Lipcon, 2012-10-17, 19:27
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