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[HADOOP-9601] Support native CRC on byte arrays - Hadoop - [issue]
...When we first implemented the Native CRC code, we only did so for direct byte buffers, because these correspond directly to native heap memory and thus make it easy to access via JNI. We'd g...
http://issues.apache.org/jira/browse/HADOOP-9601    Author: Todd Lipcon, 2014-08-18, 22:59
[HADOOP-9150] Unnecessary DNS resolution attempts for logical URIs - Hadoop - [issue]
...In the FileSystem code, we accidentally try to DNS-resolve the logical name before it is converted to an actual domain name. In some DNS setups, this can cause a big slowdown - eg in one mis...
http://issues.apache.org/jira/browse/HADOOP-9150    Author: Todd Lipcon, 2014-08-01, 03:30
[HADOOP-10882] Move DirectBufferPool into common util - Hadoop - [issue]
...MAPREDUCE-2841 uses a direct buffer pool to pass data back and forth between native and Java code. The branch has an implementation which appears to be derived from the one in HDFS. Instead ...
http://issues.apache.org/jira/browse/HADOOP-10882    Author: Todd Lipcon, 2014-07-24, 15:59
[HADOOP-10855] Allow Text to be read with a known length - Hadoop - [issue]
...For the native task work (MAPREDUCE-2841) it is useful to be able to store strings in a different fashion than the default (varint-prefixed) serialization. We should provide a "read" method ...
http://issues.apache.org/jira/browse/HADOOP-10855    Author: Todd Lipcon, 2014-07-23, 15:58
[HADOOP-6069] Remove explicit dynamic loading of libz in native code - Hadoop - [issue]
...The native zlib code currently uses dlopen/dlsym to dynamically load libz. This used to make sense when there was an lzo option (so you could load libhadoop for lzo purposes without requirin...
http://issues.apache.org/jira/browse/HADOOP-6069    Author: Todd Lipcon, 2014-07-22, 22:43
[HADOOP-5888] Improve test run time by avoiding lookups - Hadoop - [issue]
...HADOOP-3694 discusses the fact that is slower to reverse than on a lot of systems. The replacing of with was only partially completed in that ticket. This...
http://issues.apache.org/jira/browse/HADOOP-5888    Author: Todd Lipcon, 2014-07-22, 20:51
[HADOOP-10859] Native implementation of java Checksum interface - Hadoop - [issue]
...Some parts of our code such as IFileInputStream/IFileOutputStream use the java Checksum interface to calculate/verify checksums. Currently we don't have a native implementation of these. For...
http://issues.apache.org/jira/browse/HADOOP-10859    Author: Todd Lipcon, 2014-07-18, 16:40
[HADOOP-8158] Interrupting hadoop fs -put from the command line causes a LeaseExpiredException - Hadoop - [issue]
...If you run "hadoop fs -put - foo", write a few lines, then ^C it from the shell, about half the time you will get a LeaseExpiredException. It seems like the shell is first calling delete() o...
http://issues.apache.org/jira/browse/HADOOP-8158    Author: Todd Lipcon, 2014-07-13, 11:37
[HADOOP-6947] Kerberos relogin should set refreshKrb5Config to true - Hadoop - [issue]
...In working on securing a daemon that uses two different principals from different threads, I found that I wasn't able to login from a second keytab after I'd logged in from the first. This i...
http://issues.apache.org/jira/browse/HADOOP-6947    Author: Todd Lipcon, 2014-06-20, 11:15
[HADOOP-9618] Add thread which detects JVM pauses - Hadoop - [issue]
...Often times users struggle to understand what happened when a long JVM pause (GC or otherwise) causes things to malfunction inside a Hadoop daemon. For example, a long GC pause while logging...
http://issues.apache.org/jira/browse/HADOOP-9618    Author: Todd Lipcon, 2014-05-07, 21:41
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