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Re: HA for hadoop-0.20.2 - HDFS - [mail # dev]
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...Hi Liu, HA in Hadoop 2 was nearly a year-long project. There's likely no way you'll be able to backport it onto 0.20 and end up with a stable product. If you want to attempt it, ...
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Author: Todd Lipcon,
2012-11-14, 17:14
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[HDFS-2465] Add HDFS support for fadvise readahead and drop-behind - HDFS - [issue]
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...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 ...
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http://issues.apache.org/jira/browse/HDFS-2465
Author: Todd Lipcon,
2012-11-13, 03:36
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[HDFS-4176] EditLogTailer should call rollEdits with a timeout - HDFS - [issue]
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...When the EditLogTailer thread calls rollEdits() on the active NN via RPC, it currently does so without a timeout. So, if the active NN has frozen (but not actually crashed), this call can ha...
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http://issues.apache.org/jira/browse/HDFS-4176
Author: Todd Lipcon,
2012-11-12, 19:11
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[HDFS-3455] Add docs for NameNode initializeSharedEdits and bootstrapStandby commands - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3455
Author: Todd Lipcon,
2012-11-08, 21:02
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[HDFS-2824] HA: failover does not succeed if prior NN died just after creating an edit log segment - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-2824
Author: Todd Lipcon,
2012-11-02, 23:06
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[HDFS-4135] Add method to DFSOutputStream to dump pipeline status - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-4135
Author: Todd Lipcon,
2012-11-01, 17:06
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Re: HDFS HA with HDFS Federation - HDFS - [mail # dev]
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...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...
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Author: Todd Lipcon,
2012-10-31, 20:10
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[HDFS-3573] Supply NamespaceInfo when instantiating JournalManagers - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3573
Author: Todd Lipcon,
2012-10-31, 14:01
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[HDFS-3695] Genericize format() to non-file JournalManagers - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-3695
Author: Todd Lipcon,
2012-10-31, 14:01
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Re: Running Application (YARN) on top of federated NameNode - HDFS - [mail # dev]
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...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 ...
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Author: Todd Lipcon,
2012-10-29, 23:21
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