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 <mujt...@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...@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...@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 <mujt...@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...@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. >>>>> >>>>> >>>> >>> >> >
