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Accumulo >> mail # dev >> ingest performance oscillations and Xceivers


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Re: ingest performance oscillations and Xceivers
Here it is again.  It got sent the last time. Does the e-mail list strip out attachments?

On Jan 3, 2013, at 7:47 PM, Josh Elser wrote:

> I think you missed your attachment :)
>
> On 01/03/2013 07:31 PM, Kepner, Jeremy - 0553 - MITLL wrote:
>> Attached is the log for a set for 3 ingests.  The first hump is with 1 ingestor, the second hump is with 2 ingestors, and the third hump is with 3 ingestors.  The 3 ingestor case starts oscillating about 21:40. I don't see any spikes in any of the fields.  It would be nice if there was also a plot of Xceivers since I think that anti-correlates.  I do sometimes see the hold times highlighted in red.  The values are usually in hundreds of msec.
>>
>> On Jan 3, 2013, at 6:04 PM, John Vines wrote:
>>
>>> How many hard drives and what's your max minor/maor compactions set to?
>>> These can severely limit your performance due to potential disk thrashing.
>>> If you observe the monitor, when ingest starts trailing, do you see it
>>> undergoing, or possibly being backed up on, any form of compaction? And
>>> lastly, are you see the bug eric mentioned above? See if the monitor is
>>> reporting any warnings like those mentioned.