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Re: profiling hdfs write path - HDFS - [mail # dev]
...On Tue, Dec 4, 2012 at 9:07 AM, Radim Kolar  wrote:  If you're just going to insult us, please stay away. We don't need your help unless you're going to be constructive.  Todd...
   Author: Todd Lipcon, 2012-12-04, 17:27
[HDFS-2014] bin/hdfs no longer works from a source checkout - HDFS - [issue]
...bin/hdfs now appears to depend on ../libexec, which doesn't exist inside of a source checkout:todd@todd-w510:~/git/hadoop-hdfs$ ./bin/hdfs namenode./bin/hdfs: line 22: /home/todd/git/hadoop-...
http://issues.apache.org/jira/browse/HDFS-2014    Author: Todd Lipcon, 2012-11-29, 09:11
[HDFS-4169] Add per-disk latency metrics to DataNode - HDFS - [issue]
...Currently, if one of the drives on the DataNode is slow, it's hard to determine what the issue is. This can happen due to a failing disk, bad controller, etc. It would be preferable to expos...
http://issues.apache.org/jira/browse/HDFS-4169    Author: Todd Lipcon, 2012-11-29, 03:34
[HDFS-3529] Use direct buffers for data in write path - HDFS - [issue]
...The write path currently makes several unnecessary data copies in order to go to and from byte arrays. We can improve performance by using direct byte buffers to avoid the copy. This is also...
http://issues.apache.org/jira/browse/HDFS-3529    Author: Todd Lipcon, 2012-11-26, 17:52
Re: murmur3 instead of crc32 - HDFS - [mail # dev]
...Hi Radim,  With SSE4.2 support, the iSCSI CRC32C is the fastest method available. As of HDFS 2, we use that method by default for new files.  -Todd  On Sun, Nov 25, 2012 at 6:...
   Author: Todd Lipcon, 2012-11-26, 03:38
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
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