Skip to content
Large-Scale Data Engineering in Cloud

Performance Tuning, Cost Optimization / Internals, Research by Dmitry Tolpeko

  • About
  • About
  • Flink,  JVM,  Memory,  YARN

    Flink 1.9 – Off-Heap Memory on YARN – Troubleshooting Container is Running Beyond Physical Memory Limits Errors

    April 29, 2020

    On one of my clusters I got my favorite YARN error, although now it was in a Flink application:

    Container is running beyond physical memory limits. Current usage: 99.5 GB of 99.5 GB physical memory used; 105.1 GB of 227.8 GB virtual memory used. Killing container.

    Why did the container take so much physical memory and fail? Let’s investigate in detail.

    Read More
    dmtolpeko
  • Hadoop,  JVM,  Memory,  YARN

    Hadoop YARN – Container Virtual Memory – Understanding and Solving “Container is running beyond virtual memory limits” Errors

    February 19, 2020

    In the previous article about YARN container memory (see, Tez Memory Tuning – Container is Running Beyond Physical Memory Limits) I wrote about the physical memory. Now I would like to pay attention to the virtual memory in YARN.

    A typical YARN memory error may look like this:

    Container is running beyond virtual memory limits. Current usage: 1.0 GB of 1.1 GB physical memory used; 2.9 GB of 2.4 GB virtual memory used. Killing container.
    

    So what is the virtual memory, how to solve such errors and why is the virtual memory size often so large?

    Read More
    dmtolpeko
  • Hive,  JVM,  Tez

    Apache Hive on Tez – Quick On The Fly Profiling of Long Running Tasks Using Jstack Probes and Flame Graphs

    November 20, 2019

    I was asked to diagnose and tune a long and complex ad-hoc Hive query that spent more than 4 hours on the reduce stage. The fetch from the map tasks and the merge phase completed fairly quickly (within 10 minutes) and the reducers spent most of their time iterating the input rows and performing the aggregations defined by the query – MIN, SUM, COUNT and PERCENTILE_APPROX and others on the specific columns.

    After the merge phase a Tez reducer does not output many log records to help you diagnose the performance issues and find the bottlenecks. In this article I will describe how you can profile an already running Tez task without restarting the job.

    Read More
    dmtolpeko

Recent Posts

  • Nov 26, 2023 ORDER BY in Spark – How Global Sort Is Implemented, Sampling, Range Rartitioning and Skew
  • Oct 25, 2023 Reading JSON in Spark – Full Read for Inferring Schema and Sampling, SamplingRatio Option Implementation and Issues
  • Oct 15, 2023 Distributed COUNT DISTINCT – How it Works in Spark, Multiple COUNT DISTINCT, Transform to COUNT with Expand, Exploded Shuffle, Partial Aggregations
  • Oct 10, 2023 Spark – Reading Parquet – Pushed Filters, SUBSTR(timestamp, 1, 10), LIKE and StringStartsWith
  • Oct 06, 2023 Spark Stage Restarts – Partial Restarts, Multiple Retry Attempts with Different Task Sets, Accepted Late Results from Failed Stages, Cost of Restarts

Archives

  • November 2023 (1)
  • October 2023 (5)
  • September 2023 (1)
  • July 2023 (1)
  • August 2022 (4)
  • April 2022 (1)
  • March 2021 (2)
  • January 2021 (2)
  • June 2020 (4)
  • May 2020 (8)
  • April 2020 (3)
  • February 2020 (3)
  • December 2019 (5)
  • November 2019 (4)
  • October 2019 (1)
  • September 2019 (2)
  • August 2019 (1)
  • May 2019 (9)
  • April 2019 (2)
  • January 2019 (3)
  • December 2018 (4)
  • November 2018 (1)
  • October 2018 (6)
  • September 2018 (2)

Categories

  • Amazon (14)
  • Auto Scaling (1)
  • AWS (28)
  • Cost Optimization (1)
  • CPU (2)
  • Data Skew (2)
  • Distributed (1)
  • EC2 (1)
  • EMR (13)
  • ETL (2)
  • Flink (5)
  • Hadoop (14)
  • Hive (17)
  • Hue (1)
  • I/O (25)
  • JSON (1)
  • JVM (3)
  • Kinesis (1)
  • Logs (1)
  • Memory (7)
  • Monitoring (4)
  • Optimizer (2)
  • ORC (5)
  • Parquet (8)
  • Pig (2)
  • Presto (3)
  • Qubole (2)
  • RDS (1)
  • S3 (18)
  • Snowflake (6)
  • Spark (17)
  • Storage (14)
  • Tez (10)
  • YARN (18)

Meta

  • Log in
  • Entries feed
  • Comments feed
  • WordPress.org
Savona Theme by Optima Themes