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From jackylk <...@git.apache.org>
Subject [GitHub] carbondata pull request #1014: [CARBONDATA-1150]updated configuration-parame...
Date Sat, 17 Jun 2017 15:22:51 GMT
Github user jackylk commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/1014#discussion_r122570744
  
    --- Diff: docs/configuration-parameters.md ---
    @@ -58,7 +58,7 @@ This section provides the details of all the configurations required
for CarbonD
     | carbon.merge.sort.prefetch | true | Enable prefetch of data during merge sort while
reading data from sort temp files in data loading. |  |
     | carbon.update.persist.enable | true | Enabling this parameter considers persistent
data. Enabling this will reduce the execution time of UPDATE operation. |  |
     | carbon.load.global.sort.partitions | 0 | The Number of partitions to use when shuffling
data for sort. If user don't configurate or configurate it less than 1, it uses the number
of map tasks as reduce tasks. In general, we recommend 2-3 tasks per CPU core in your cluster.
    -
    +| carbon.enable.vector.reader | true | This parameter increases the query performance.
| |
    --- End diff --
    
    I think it is better to give more information about this option, perhaps you can describe
why it can increase performance and give hint when to enable this feature


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