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Re: HDFS append on upgraded cluster - HDFS - [mail # dev]
...Hi Vinayakumar,  If you append to a block which has hard-links, then it will get copied on write at the DataNode. See this code:    /**    * Make a copy of the block...
   Author: Todd Lipcon, 2012-11-19, 19:10
Re: 答复: What is the reason that DataNode should configured the http and streamer port with a number under 1024 in secure mode? - HDFS - [mail # dev]
...On Sun, Nov 18, 2012 at 8:28 PM, Xiaohan  wrote:   The DN->NN RPCs come in on a different port and different IPC interface than the client RPCs. The DN->NN RPC only allows a ...
   Author: Todd Lipcon, 2012-11-19, 18:01
[HDFS-528] Add ability for safemode to wait for a minimum number of live datanodes - HDFS - [issue]
...When starting up a fresh cluster programatically, users often want to wait until DFS is "writable" before continuing in a script. "dfsadmin -safemode wait" doesn't quite work for this on a c...
http://issues.apache.org/jira/browse/HDFS-528    Author: Todd Lipcon, 2012-11-19, 06:53
[HDFS-4202] Some usage of GetConf tool not compatible with federation - HDFS - [issue]
...In the start/stop scripts, we use the "getconf" tool to look up certain config keys to discover hosts we need to start/stop daemons on. However, some of these configs are optionally suffixed...
http://issues.apache.org/jira/browse/HDFS-4202    Author: Todd Lipcon, 2012-11-16, 21:48
Re: HA for hadoop-0.20.2 - HDFS - [mail # dev]
...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, ...
   Author: Todd Lipcon, 2012-11-14, 17:14
[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-4176] EditLogTailer should call rollEdits with a timeout - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-4176    Author: Todd Lipcon, 2012-11-12, 19:11
[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
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