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ispeed:features [2017/12/07 15:33]
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ispeed:features [2017/12/07 15:36] (current)
master [Parameter Explanation]
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   * ''​-t st_intersections'' ​ is the default predicate for data compression;​ ''​-a'' ​ and ''​-b'' ​ specify the paths of input dataset.   * ''​-t st_intersections'' ​ is the default predicate for data compression;​ ''​-a'' ​ and ''​-b'' ​ specify the paths of input dataset.
-  * The core parameter in this command is ''​- - compression'' ​ to specify the data compression operations.+  * The core parameter in this command is ''​%%--%%compression'' ​ to specify the data compression operations.
  
 The second step is to combine the compressed data, store it into memory and share it across all cluster nodes. The object MBBs are also combined for data partitioning. The second step is to combine the compressed data, store it into memory and share it across all cluster nodes. The object MBBs are also combined for data partitioning.
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   * ''​-s 1.0'' ​ is the data sampling rate for spatial partitioning,​ ''​-u fg_3d'' ​ specifies the fixed-grid partitioning method and ''​bucket 4000'' ​ is the bucket size for partitioning. So after data partitioning,​ each partitioned cuboid contains about 4000 objects.   * ''​-s 1.0'' ​ is the data sampling rate for spatial partitioning,​ ''​-u fg_3d'' ​ specifies the fixed-grid partitioning method and ''​bucket 4000'' ​ is the bucket size for partitioning. So after data partitioning,​ each partitioned cuboid contains about 4000 objects.
   * ''​-n 240'' ​ is the number of reducers for this MapReduce job. This number is adjustable based on the cluster configurations.   * ''​-n 240'' ​ is the number of reducers for this MapReduce job. This number is adjustable based on the cluster configurations.
-  * ''​- -spatialproc'' ​ indicates this is the spatial query process, and ''​- -decomplod 100'' ​ specifies the level of detail (LOD) used in the spatial join query. Users can choose different LODs (resolutions) to balance the run time and accuracy in practice.+  * ''​%%--%%spatialproc'' ​ indicates this is the spatial query process, and ''​%%--%%decomplod 100'' ​ specifies the level of detail (LOD) used in the spatial join query. Users can choose different LODs (resolutions) to balance the run time and accuracy in practice.