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Posted to issues@impala.apache.org by "Mostafa Mokhtar (JIRA)" <ji...@apache.org> on 2017/04/04 17:12:41 UTC
[jira] [Created] (IMPALA-5158) Memory manager : Discrepancy between
process memory consumption and memory used by a query
Mostafa Mokhtar created IMPALA-5158:
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Summary: Memory manager : Discrepancy between process memory consumption and memory used by a query
Key: IMPALA-5158
URL: https://issues.apache.org/jira/browse/IMPALA-5158
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 2.9.0
Reporter: Mostafa Mokhtar
Assignee: Tim Armstrong
Priority: Critical
Attachments: Screen Shot 2017-04-04 at 10.11.12 AM.png, tpcds_q78_memory_discrepancy.txt
There is discrepancy between process wide memory usage and memory used by the query, in the example below the query is using 26.54 GB while the process is reporting 11.63 GB
Process memory usage
{code}
Memory Usage
Memory consumption / limit: 11.63 GB / 220.00 GB
{code}
Breakdown
{code}
Process: Limit=220.00 GB Total=11.63 GB Peak=183.69 GB
Free Disk IO Buffers: Total=1.71 GB Peak=1.71 GB
RequestPool=fe-eval-exprs: Total=0 Peak=4.00 KB
RequestPool=root.mmokhtar: Total=26.54 GB Peak=90.13 GB
Query(4b403f9f6fe2ecf6:4f81291100000000): Limit=55.00 GB Total=26.54 GB Peak=44.26 GB
Fragment 4b403f9f6fe2ecf6:4f81291100000000: BufferPoolUsed/Reservation=0/0 OtherMemory=84.80 KB Total=84.80 KB Peak=1.53 MB
EXCHANGE_NODE (id=36): Total=4.00 KB Peak=4.00 KB
Exprs: Total=4.00 KB Peak=4.00 KB
DataStreamRecvr: Total=67.38 KB Peak=67.38 KB
PLAN_ROOT_SINK: Total=0 Peak=0
CodeGen: Total=5.42 KB Peak=1.52 MB
Fragment 4b403f9f6fe2ecf6:4f81291100000045: BufferPoolUsed/Reservation=0/26.54 GB OtherMemory=243.20 KB Total=26.54 GB Peak=26.54 GB
SORT_NODE (id=20): Total=56.00 KB Peak=56.00 KB
Exprs: Total=4.00 KB Peak=4.00 KB
HASH_JOIN_NODE (id=19): BufferPoolUsed/Reservation=6.62 GB/16.14 GB OtherMemory=56.25 KB Total=16.14 GB Peak=16.14 GB
Exprs: Total=4.00 KB Peak=4.00 KB
Hash Join Builder (join_node_id=19): Total=14.12 KB Peak=22.12 KB
HASH_JOIN_NODE (id=18): BufferPoolUsed/Reservation=0/7.31 GB OtherMemory=66.25 KB Total=7.31 GB Peak=7.31 GB
Exprs: Total=4.00 KB Peak=4.00 KB
Hash Join Builder (join_node_id=18): Total=23.12 KB Peak=31.12 KB
AGGREGATION_NODE (id=25): BufferPoolUsed/Reservation=0/3.08 GB OtherMemory=31.12 KB Total=3.08 GB Peak=3.08 GB
Exprs: Total=8.00 KB Peak=8.00 KB
EXCHANGE_NODE (id=24): Total=0 Peak=0
EXCHANGE_NODE (id=30): Total=0 Peak=0
DataStreamRecvr: Total=0 Peak=2.47 MB
EXCHANGE_NODE (id=35): Total=0 Peak=0
DataStreamRecvr: Total=0 Peak=22.96 MB
DataStreamSender (dst_id=36): Total=1008.00 B Peak=1008.00 B
CodeGen: Total=24.59 KB Peak=4.67 MB
{code}
This was captured while running TPC-DS Q78
{code}
with ws as
(select d_year AS ws_sold_year, ws_item_sk,
ws_bill_customer_sk ws_customer_sk,
sum(ws_quantity) ws_qty,
sum(ws_wholesale_cost) ws_wc,
sum(ws_sales_price) ws_sp
from web_sales
left join web_returns on wr_order_number=ws_order_number and ws_item_sk=wr_item_sk
join date_dim on ws_sold_date_sk = d_date_sk
where wr_order_number is null
group by d_year, ws_item_sk, ws_bill_customer_sk
),
cs as
(select d_year AS cs_sold_year, cs_item_sk,
cs_bill_customer_sk cs_customer_sk,
sum(cs_quantity) cs_qty,
sum(cs_wholesale_cost) cs_wc,
sum(cs_sales_price) cs_sp
from catalog_sales
left join catalog_returns on cr_order_number=cs_order_number and cs_item_sk=cr_item_sk
join date_dim on cs_sold_date_sk = d_date_sk
where cr_order_number is null
group by d_year, cs_item_sk, cs_bill_customer_sk
),
ss as
(select d_year AS ss_sold_year, ss_item_sk,
ss_customer_sk,
sum(ss_quantity) ss_qty,
sum(ss_wholesale_cost) ss_wc,
sum(ss_sales_price) ss_sp
from store_sales
left join store_returns on sr_ticket_number=ss_ticket_number and ss_item_sk=sr_item_sk
join date_dim on ss_sold_date_sk = d_date_sk
where sr_ticket_number is null
group by d_year, ss_item_sk, ss_customer_sk
)
select
ss_sold_year, ss_item_sk, ss_customer_sk,
round(ss_qty/(coalesce(ws_qty+cs_qty,1)),2) ratio,
ss_qty store_qty, ss_wc store_wholesale_cost, ss_sp store_sales_price,
coalesce(ws_qty,0)+coalesce(cs_qty,0) other_chan_qty,
coalesce(ws_wc,0)+coalesce(cs_wc,0) other_chan_wholesale_cost,
coalesce(ws_sp,0)+coalesce(cs_sp,0) other_chan_sales_price
from ss
left join ws on (ws_sold_year=ss_sold_year and ws_item_sk=ss_item_sk and ws_customer_sk=ss_customer_sk)
left join cs on (cs_sold_year=ss_sold_year and cs_item_sk=cs_item_sk and cs_customer_sk=ss_customer_sk)
where coalesce(ws_qty,0)>0 and coalesce(cs_qty, 0)>0 and ss_sold_year=2002
order by
ss_sold_year, ss_item_sk, ss_customer_sk,
ss_qty desc, ss_wc desc, ss_sp desc,
other_chan_qty,
other_chan_wholesale_cost,
other_chan_sales_price,
round(ss_qty/(coalesce(ws_qty+cs_qty,1)),2)
limit 100;
{code}
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