---
name: watsonxdata-api_custom_jvm_pjcw
title: JVM properties for Presto (Java) - coordinator and worker nodes
description: You can customize the coordinator and worker JVM properties through an API for Presto (Java).
last-updated: 2024-12-07
---

> ## Documentation Index
> The table of contents for this documentation set is at https://cloud.ibm.com/docs/watsonxdata?format=markdown
> The index for all IBM Cloud docs is at: https://cloud.ibm.com/docs/llms.txt
> Use these files to discover more information as needed.

# JVM properties for Presto (Java) - coordinator and worker nodes
{: #api_custom_jvm_pjcw}

You can customize the coordinator and worker JVM properties through an API for Presto (Java).

| Property name | Type | Validation added |
| --- | --- | --- |
| `-XX:G1HeapRegionSize` | String | Limit {1, 1e13}; supported values are numbers with or without units TB, MB, GB, B, KB, M, G, B |
| `-XX:ReservedCodeCacheSize` | String | Limit {1, 1e13}; supported values are numbers with or without units TB, MB, GB, B, KB, M, G, B |
| `-Djdk.nio.maxCachedBufferSize` | Integer | Limit {1, 1e13} |
| `-Dalluxio.user.app.id` | String | Any string |
| `-Duser.timezone` | String | Any string |
| `-xgc` | String | Any string |
| `-Xmx` | String | Any string |
|`-Xms` | String | Any string |
{: caption="JVM properties for Presto (Java) - coordinator and worker nodes" caption-side="bottom"}