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[MAPREDUCE-4919] All maps hangs when set mapreduce.task.io.sort.factor to 1
...In one of my testing that when I set mapreduce.task.io.sort.factor to 1, all the maps hang and will never end. But the CPU usage for each node are very high and until killed by the app maste...
, 2015-05-13, 15:40
[MAPREDUCE-4961] Map reduce running local should also go through ShuffleConsumerPlugin for enabling different MergeManager implementations
...MAPREDUCE-4049 provide the ability for pluggable Shuffle and MAPREDUCE-4080 extends Shuffle to be able to provide different MergeManager implementations. While using these pluggable features...
, 2015-03-10, 04:59
[MAPREDUCE-4868] Allow multiple iteration for map
...Currently, the Mapper class allows advanced users to override "public void run(Context context)" method for more control over the execution of the mapper, while Context interface limit the o...
, 2014-02-24, 20:40
[MAPREDUCE-5025] Key Distribution and Management for supporting crypto codec in Map Reduce
...This task defines the work to enable Map Reduce to utilize the Crypto Codec framework to support encryption and decryption of data during MapReduce Job.According to the some real use case an...
, 2013-09-25, 08:35
[MAPREDUCE-5494] Hash-based MapReduce
...To support parallel processing, the MapReduce computation model essentially implements group data by key, then apply the reduce function to each group. The currently implementation of MapRed...
, 2013-09-09, 06:07
[MAPREDUCE-4958] close method of RawKeyValueIterator is not called after finish using.
...I observed that the close method of the RawKeyValueIterator returned from MergeManager is not called.Which will cause resource leaks for RawKeyValueIterator implementation which depends on t...
, 2013-01-26, 02:56
[MAPREDUCE-4891] Pluggable merge at reduce side
...The current implementation of sort in MapReduce is cooperated by Map side sort and Reduce side merge. MAPREDUCE-2454 provided pluggable sort at the Map side currently and pluggable shu...
, 2012-12-24, 02:52
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