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From Amit Shah <amits...@gmail.com>
Subject Re: Region Server Crash On Upsert Query Execution
Date Fri, 01 Apr 2016 14:15:59 GMT
I tried raising the region server heap memory to 3.5 GB (I have only 8 gb
on my dev server of which I have given 2 GB to the hbase bucket cache). On
jconsole I see the max heap size as 1.78 GB.
What could be the reason of the difference in the heap size?

On Thu, Mar 31, 2016 at 11:26 PM, Mujtaba Chohan <mujtaba@apache.org> wrote:

> For Phoenix phoenix.query.maxGlobalMemoryPercentage is 15% of heap
> https://phoenix.apache.org/tuning.html. Block cache and memstore memory
> setting are via usual HBase settings and their usage is exposed via jmx at
> http://<rs_ip>:60030/jmx. Was there any useful info in GC logs? Also 2GB
> heap is on the low side, can you rerun you test with setting heap to 5 and
> 10GB?
>
> On Thu, Mar 31, 2016 at 7:01 AM, Amit Shah <amits.84@gmail.com> wrote:
>
>> Another such instance of the crash is described below.
>>
>>
>> When the regions are evenly distributed across the 3 region servers, one
>> of the region server crashes without any errors in the logs. It has long GC
>> pauses. The heap usage on the server had not crossed above 900 MB and the
>> allocated heap is upto 2 GB.   Attached are logs and jconsole screenshot.
>>
>>
>>
>> Wonder what is causing the GC pauses? Any idea on how is the region
>> server heap distribution across the block cache, phoenix usage, memstore
>> etc?
>>
>>
>> Thanks,
>>
>> Amit.
>>
>>
>>
>> On Thu, Mar 31, 2016 at 7:14 PM, Amit Shah <amits.84@gmail.com> wrote:
>>
>>> There have been multiple reasons of the region server jvm crash. For one
>>> of such errors, the logs are attached. Let me know your inputs.
>>>
>>> Thanks,
>>> Amit.
>>>
>>>
>>> On Thu, Mar 31, 2016 at 6:15 PM, Mujtaba Chohan <mujtaba@apache.org>
>>> wrote:
>>>
>>>> Can you attached last couple of hundred lines from RS log before it
>>>> crashed? Also what's the RS heap size?
>>>>
>>>>
>>>> On Thu, Mar 31, 2016 at 1:48 AM, Amit Shah <amits.84@gmail.com> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> We have been experimenting hbase (version 1.0) and phoenix (version
>>>>> 4.6) for our OLAP workload. In order to precalculate aggregates we have
>>>>> been executing an upsert phoenix query that aggregates raw data (over
10
>>>>> mil records) to generate an OLAP cube.
>>>>>
>>>>> While executing the query, one of the region servers in a cluster of
3
>>>>> RS crashes. I am trying to figure out what could be causing the region
>>>>> server to crash.
>>>>> The server shows high disk operations before the jvm crashed. Kindly
>>>>> find the disk and other stats attached.
>>>>>
>>>>> Any suggestions on where could I look into would be helpful.
>>>>>
>>>>> The upsert query that was executed is
>>>>>
>>>>> upsert into AGENT_TER_PRO
>>>>> (AGENT_ID,TERRITORY_ID,PRODUCT_ID,SUM_TOTAL_SALES,SUM_TOTAL_EXPENSES,SUM_UNIT_CNT_SOLD,AVG_PRICE_PER_UNIT)
>>>>> select /*+ INDEX(TRANSACTIONS  AG_TER_PRO2) */
>>>>>  AGENT_ID,TERRITORY_ID,PRODUCT_ID, sum(TOTAL_SALES)
>>>>> SUM_TOTAL_SALES,sum(TOTAL_EXPENSES) SUM_TOTAL_EXPENSES,sum(UNIT_CNT_SOLD)
>>>>> SUM_UNIT_CNT_SOLD,AVG(PRICE_PER_UNIT)  AVG_PRICE_PER_UNIT  from
>>>>> TRANSACTIONS   group by AGENT_ID,TERRITORY_ID,PRODUCT_ID;
>>>>>
>>>>> Thanks,
>>>>> Amit.
>>>>>
>>>>>
>>>>
>>>
>>
>

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