FAQ
I am running an HBase cluster that swaps 20 pages per second on the region
servers. We are seeing this in the cloudera manager when we have continuous
high read/write rates.

Also, we are using 38M of swap space according to free.

We have 64GB RAM on the regions. I see our memory cached is 50GB and memory
uses is 12GB.

I have not set vm.swappiness = 0 yet, but will soon and test.

How much swapping is acceptable?

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  • Patrick Angeles at Sep 16, 2013 at 2:06 pm
    Hi, Jason.

    This is probably more a question for cdh-users, but to answer your
    question: yes, you want to avoid swapping as much as possible. Tweaking
    vm.swappiness should help, but also make sure that you're not
    overcommitting on memory (i.e., allocating more memory to your RS, DN, TT
    and tasks than you have physically available).


    On Mon, Sep 16, 2013 at 9:18 AM, Jason Loveland
    wrote:
    I am running an HBase cluster that swaps 20 pages per second on the region
    servers. We are seeing this in the cloudera manager when we have continuous
    high read/write rates.

    Also, we are using 38M of swap space according to free.

    We have 64GB RAM on the regions. I see our memory cached is 50GB and
    memory uses is 12GB.

    I have not set vm.swappiness = 0 yet, but will soon and test.

    How much swapping is acceptable?

    To unsubscribe from this group and stop receiving emails from it, send an
    email to scm-users+unsubscribe@cloudera.org.
    To unsubscribe from this group and stop receiving emails from it, send an email to scm-users+unsubscribe@cloudera.org.

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postedSep 16, '13 at 1:18p
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Jason Loveland: 1 post Patrick Angeles: 1 post

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