clear garbage collection

Question

clear garbage collection

Vineet S 1,370

Hey,

how we can clear the garbage collection from cluster

i found some article but unable to understand it

https://spark.apache.org/docs/latest/tuning.html

Bhargava-MSFT 31,226 Reputation points Microsoft Employee

2024-03-12T19:55:25.3766667+00:00

Hello Vineet S,

I am checking to see if you have any further questions here.

If this answers your question, please consider accepting the answer by hitting the Accept answer and up-vote as it helps the community look for answers to similar questions.

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Bhargava-MSFT 31,226 Reputation points Microsoft Employee

2024-03-12T19:55:25.3766667+00:00

Hello Vineet S,

I am checking to see if you have any further questions here.

If this answers your question, please consider accepting the answer by hitting the Accept answer and up-vote as it helps the community look for answers to similar questions.

Answer 1

Bhargava-MSFT 31,226 Microsoft Employee

Hello Vineet S,

My understanding is you want to configure Spark's garbage collection settings to optimize memory usage and performance.

The document mentioned about the GC algorithms. using spark.executor.extraJavaOptions

G1GC garbage collector with -XX:+UseG1GC. It can improve performance in some situations where garbage collection is a bottleneck. Note that with large executor heap sizes, it may be important to increase the [G1 region size] with -XX:G1HeapRegionSize.

To change the garbage collection method that Spark Uses: Add the following configuration options for driver and executor.

spark.driver.extraJavaOptions -XX:+UseG1GC

spark.executor.extraJavaOptions -XX:+UseG1GC

Once you add you can check in driver logs:

User's image

Reference documents:

https://javapapers.com/java/types-of-java-garbage-collectors/

https://learn.microsoft.com/en-us/answers/questions/1462684/databricks-interactive-clusters-are-restarting-due

I hope this answers your question.

Vineet S 1,370 Reputation points

2024-03-14T00:19:39.7933333+00:00

please help me with steps to clear garbage is it gc.collect()
Bhargava-MSFT 31,226 Reputation points Microsoft Employee

2024-03-14T21:31:00.5833333+00:00
Hi Vineet S,

My understanding is that Spark runtime has its own garbage collector that automatically frees up memory when objects are no longer referenced.

However, you can optimize garbage collection in a Databricks cluster by configuring Spark's garbage collection settings to improve memory usage and performance. This involves tuning the JVM settings for Spark, as I mentioned in my previous response.

To change the garbage collection method that Spark Uses: Add the following configuration options for driver and executor.

spark.driver.extraJavaOptions -XX:+UseG1GC

Spark.executor.extraJavaOptions -XX:+UseG1GC

After making these changes, the Spark runtime will use the G1GC garbage collector to optimize garbage collection in the cluster.

I hope this helps.

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