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[MAPREDUCE-4591] Extend IFile format to include optional metadata - MapReduce - [issue]
...By including sections for per-segment and per-spill metadata, one can embed information useful to consumers (e.g., information on key ranges, sampling, etc.). These changes make IFiles ideal...
http://issues.apache.org/jira/browse/MAPREDUCE-4591    Author: Chris Douglas, 2012-08-25, 01:21
[MAPREDUCE-4590] ReduceTask preemption - MapReduce - [issue]
...With a facility for addressing subsequences of the reduce input keygroups (such as MAPREDUCE-4587), a ReduceTask can efficiently checkpoint and restart itself. In some cases, a memento (i.e....
http://issues.apache.org/jira/browse/MAPREDUCE-4590    Author: Chris Douglas, 2012-08-25, 01:21
[MAPREDUCE-4589] MapTask preemption - MapReduce - [issue]
...For many input types, it is possible to restore the state of a RecordReader by writing a new split for the remaining data (e.g., storing the inflater state with a file offset for gzip text)....
http://issues.apache.org/jira/browse/MAPREDUCE-4589    Author: Chris Douglas, 2012-08-25, 01:20
[MAPREDUCE-4588] Map local segments as on-disk segments - MapReduce - [issue]
...Local map segments should never be handled as though they were remote (i.e., copied through a servlet to local disk). This optimization is uniformally more efficient for the fetch, though it...
http://issues.apache.org/jira/browse/MAPREDUCE-4588    Author: Chris Douglas, 2012-08-25, 01:20
[MAPREDUCE-4587] Support fetch by key boundaries for memcmp types - MapReduce - [issue]
...Intermediate data addressable by key support not only restartable streams, but partitioning after the map output are written. With sampling of map output, a job can implement a total-order a...
http://issues.apache.org/jira/browse/MAPREDUCE-4587    Author: Chris Douglas, 2012-08-25, 01:20
Re: question about org.apache.hadoop.mapred.join - MapReduce - [mail # user]
...Your understanding is correct. The framework doesn't do anything to align input splits across datasets. In the situation you describe- where one can't seek among key groups in the input data...
   Author: Chris Douglas, 2012-04-10, 17:33
[MAPREDUCE-1683] Remove JNI calls from ClusterStatus cstr - MapReduce - [issue]
...The ClusterStatus constructor makes two JNI calls to the Runtime to fetch memory information. ClusterStatus instances are often created inside the JobTracker to obtain other, unrelated metri...
http://issues.apache.org/jira/browse/MAPREDUCE-1683    Author: Chris Douglas, 2011-12-12, 06:18
[MAPREDUCE-1376] Support for varied user submission in Gridmix - MapReduce - [issue]
...Gridmix currently submits all synthetic jobs as the client user. It should be possible to map users in the trace to a set of users appropriate for the target cluster....
http://issues.apache.org/jira/browse/MAPREDUCE-1376    Author: Chris Douglas, 2011-12-12, 06:18
Re: Yarn NodeManager services - MapReduce - [mail # dev]
...On Tue, Oct 11, 2011 at 2:05 PM,   wrote:  A general-purpose transfer protocol for intermediate data was designed and scrapped for time. So was a local service allocated and shared...
   Author: Chris Douglas, 2011-10-11, 21:33
[MAPREDUCE-499] Revert extra debugging - MapReduce - [issue]
...It appears that HADOOP-3647 is actually caused by a bad disk, unobserved given HADOOP-4277. The extra debugging can be removed....
http://issues.apache.org/jira/browse/MAPREDUCE-499    Author: Chris Douglas, 2011-09-18, 22:57
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