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https://issues.apache.org/jira/browse/SPARK-17930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15581119#comment-15581119
]
Guoqiang Li commented on SPARK-17930:
-------------------------------------
TPC-DS 2T data (Parquet) and the SQL(query 2) =>
{noformat}
select i_item_id,
avg(ss_quantity) agg1,
avg(ss_list_price) agg2,
avg(ss_coupon_amt) agg3,
avg(ss_sales_price) agg4
from store_sales, customer_demographics, date_dim, item, promotion
where ss_sold_date_sk = d_date_sk and
ss_item_sk = i_item_sk and
ss_cdemo_sk = cd_demo_sk and
ss_promo_sk = p_promo_sk and
cd_gender = 'M' and
cd_marital_status = 'M' and
cd_education_status = '4 yr Degree' and
(p_channel_email = 'N' or p_channel_event = 'N') and
d_year = 2001
group by i_item_id
order by i_item_id
limit 100;
{noformat}
spark-defaults.conf =>
{noformat}
spark.master yarn-client
spark.executor.instances 20
spark.driver.memory 16g
spark.executor.memory 30g
spark.executor.cores 5
spark.default.parallelism 100
spark.sql.shuffle.partitions 100000
spark.serializer
org.apache.spark.serializer.KryoSerializer
spark.driver.maxResultSize 0
spark.rpc.netty.dispatcher.numThreads 8
spark.executor.extraJavaOptions -XX:+UseG1GC
-XX:+UseStringDeduplication -XX:G1HeapRegionSize=16M -XX:MetaspaceSize=256M
spark.cleaner.referenceTracking.blocking true
spark.cleaner.referenceTracking.blocking.shuffle true
{noformat}
Performance test results are as follows =>
||[SPARK-17930|https://github.com/witgo/spark/tree/SPARK-17930]||[ed14633|https://github.com/witgo/spark/commit/ed1463341455830b8867b721a1b34f291139baf3]||
|54.5 s|231.7 s|
> The SerializerInstance instance used when deserializing a TaskResult is not
> reused
> -----------------------------------------------------------------------------------
>
> Key: SPARK-17930
> URL: https://issues.apache.org/jira/browse/SPARK-17930
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.6.1, 2.0.1
> Reporter: Guoqiang Li
>
> The following code is called when the DirectTaskResult instance is
> deserialized
> {noformat}
> def value(): T = {
> if (valueObjectDeserialized) {
> valueObject
> } else {
> // Each deserialization creates a new instance of SerializerInstance,
> which is very time-consuming
> val resultSer = SparkEnv.get.serializer.newInstance()
> valueObject = resultSer.deserialize(valueBytes)
> valueObjectDeserialized = true
> valueObject
> }
> }
> {noformat}
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