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public intgetPartition(Text key, LongWritable value, int numOfReducer) { // 本例设置reducer个数为25,所以比如长度为26的单词会和长度为1的单词分配到同一个分区 return key.toString().length() % numOfReducer; } } 4) WordsFrequenciesCombiner.java packagecom.oserp.wordsfrequencies; importjava.io.I...
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一、概述我们知道Spark Shuffle机制总共有三种:1.未优化的Hash Shuffle:每一个ShuffleMapTask都会为每一个ReducerTask创建一个单独的文件,总的文件数是S * R,不仅文件数量很多,造成频繁的磁盘和网络I/O,而且内存负担也很大,GC频繁,经常出现OOM。2.优化后Hash Shuffle:改进后的Shuffle,启用consolidation机制,E spark...
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我知道你把免责声明..但请切换到Spark或其他可以解决内存中问题的框架。你的生活会变得更好。
HBASE-2101 KeyValueSortReducer collapses all values to last passed HBASE-2119 Fix top-level NOTICES.txt file. Its stale. HBASE-2120 [stargate] Unable to delete column families (Greg Lu via Andrew Purtell) HBASE-2123 Remove 'master' command-line option from PE ...
* [HIVE-18521] - Vectorization: query failing in reducer VectorUDAFAvgDecimalPartial2 java.lang.ClassCastException StructTypeInfo --> DecimalTypeInfo * [HIVE-18523] - Fix summary row in case there are no inputs * [HIVE-18524] - Vectorization: Execution failure related to non-standard embed...
* [HIVE-1465] - hive-site.xml ${user.name} not replaced for local-file derby metastore connection URL * [HIVE-1470] - percentile_approx() fails with more than 1 reducer * [HIVE-1471] - CTAS should unescape the column name in the select-clause. ...
); StringTokenizeritr=newStringTokenizer(line); while(itr.hasMoreTokens()){ word.set(itr.nextToken()); output.collect(word,one); } } } /** *Areducerclassthatjustemitsthesumoftheinputvalues. */ publicstaticclassReduceextendsMapReduceBaseimplements Reducer<Text,IntWritable,Text,IntWritable>{