This is just a counter to show you the size of cached RDDs. If it is
zero means that no caching has occurred. Also, even storage memory is
used for computing the counter will show as zero.
Iacovos
On 20/3/20 4:51 μ.μ., Michel Sumbul wrote:
Hi,
Thanks for the very quick reply!
If I see the metrics "storage memory", always at 0, does that mean
that the memory is neither used for caching or computing?
Thanks,
Michel
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Le ven. 20 mars 2020 à 14:45, Jack Kolokasis <koloka...@ics.forth.gr
<mailto:koloka...@ics.forth.gr>> a écrit :
Hello Michel,
Spark seperates executors memory using an adaptive boundary between
storage and execution memory. If there is no caching and execution
memory needs more space, then it will use a portion of the storage
memory.
If your program does not use caching then you can reduce storage
memory.
Iacovos
On 20/3/20 4:40 μ.μ., msumbul wrote:
> Hello,
>
> Im asking mysef the exact meaning of the setting of
> spark.memory.storageFraction.
> The documentation mention:
>
> "Amount of storage memory immune to eviction, expressed as a
fraction of the
> size of the region set aside by spark.memory.fraction. The
higher this is,
> the less working memory may be available to execution and tasks
may spill to
> disk more often"
>
> Does that mean that if there is no caching that part of the
memory will not
> be used at all?
> In the spark UI, in the tab "Executor", I can see that the
"storage memory"
> is always zero. Does that mean that that part of the memory is
never used at
> all and I can reduce it or never used for storage specifically?
>
> Thanks in advance for your help,
> Michel
>
>
>
> --
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>
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