Which Spark release are you using ?
Which OS ?
Thanks
On Sat, Oct 31, 2015 at 5:18 AM, hotdog <lisend...@163.com> wrote:
> I meet a situation:
> When I use
> val a = rdd.pipe("./my_cpp_program").persist()
> a.count() // just use it to persist a
> val b = a.map(s => (s, 1)).reduceByKey().count()
> it 's so fast
>
> but when I use
> val b = rdd.pipe("./my_cpp_program").map(s => (s, 1)).reduceByKey().count()
> it is so slow....
> and there are many such log in my executors:
> 15/10/31 19:53:58 INFO collection.ExternalSorter: Thread 78 spilling
> in-memory map of 633.1 MB to disk (8 times so far)
> 15/10/31 19:54:14 INFO collection.ExternalSorter: Thread 74 spilling
> in-memory map of 633.1 MB to disk (8 times so far)
> 15/10/31 19:54:17 INFO collection.ExternalSorter: Thread 79 spilling
> in-memory map of 633.1 MB to disk (8 times so far)
> 15/10/31 19:54:29 INFO collection.ExternalSorter: Thread 77 spilling
> in-memory map of 633.1 MB to disk (8 times so far)
> 15/10/31 19:54:50 INFO collection.ExternalSorter: Thread 76 spilling
> in-memory map of 633.1 MB to disk (9 times so far)
>
>
>
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