数据量是500G，15台机器，每台hadoop节点内存调整的是89G ，hbase集群共五台，内存是18G，500G测试数据共5163328507条数据，一张事实表，一共7个维度，这里没有设置维度表 Kylin有关内存的配置：
kylin.job.mapreduce.default.reduce.input.mb=8192//这个参数不太确定是做什么的，如果太小会引发什么后果 报错： Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in fetcher#3 at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158) Caused by: java.lang.OutOfMemoryError: Java heap space at org.apache.hadoop.io.BoundedByteArrayOutputStream. <init>(BoundedByteArrayOutputStream.java:56)at org.apache.hadoop.io.BoundedByteArrayOutputStream. <init>(BoundedByteArrayOutputStream.java:46) at org.apache.hadoop.mapreduce.task.reduce.InMemoryMapOutput.<init>(InMemoryMapOutput.java:63) at org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.unconditionalReserve(MergeManagerImpl.java:304) at org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.reserve(MergeManagerImpl.java:294) at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(Fetcher.java:511) at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:329) at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)
