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[HDFS-3429] DataNode reads checksums even if client does not need them - HDFS - [issue]
...Currently, even if the client does not want to verify checksums, the datanode reads them anyway and sends them over the wire. This means that performance improvements like HBase's applicatio...
http://issues.apache.org/jira/browse/HDFS-3429    Author: Todd Lipcon, 2013-01-15, 13:20
[HDFS-3677] dfs.namenode.edits.dir.required missing from hdfs-default.xml - HDFS - [issue]
...This config should be documented. It's useful for cases where the user would like to ensure that (eg) an NFS filer always has the most up-to-date edits....
http://issues.apache.org/jira/browse/HDFS-3677    Author: Todd Lipcon, 2012-12-28, 03:49
[HDFS-3571] Allow EditLogFileInputStream to read from a remote URL - HDFS - [issue]
...In order to start up from remote edits storage (like the JournalNodes of HDFS-3077), the NN needs to be able to load edits from a URL, instead of just local disk. This JIRA extends EditLogFi...
http://issues.apache.org/jira/browse/HDFS-3571    Author: Todd Lipcon, 2012-12-11, 19:45
[HDFS-2525] Race between BlockPoolSliceScanner and append - HDFS - [issue]
...I wrote a test which runs append() in a loop on a single file with a single replica, appending 0~100 bytes each time. If this races with the BlockPoolSliceScanner, I observe the BlockPoolSli...
http://issues.apache.org/jira/browse/HDFS-2525    Author: Todd Lipcon, 2012-12-10, 22:28
[HDFS-3626] Creating file with invalid path can corrupt edit log - HDFS - [issue]
...Joris Bontje reports the following:The following command results in a corrupt NN editlog (note the double slash and reading from stdin):$ cat /usr/share/dict/words | hadoop fs -put - hdfs://...
http://issues.apache.org/jira/browse/HDFS-3626    Author: Todd Lipcon, 2012-12-04, 19:40
[expand - 2 more] - 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
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