DNS Caching Issue in Java

Posted5 months agoActive5 months ago

tanelpoder

2 points

1 comments

chaitanyawaikar1993.medium.comTechstory

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Java DNS CachingNetworking IssuesPerformance OptimizationDNS Resolution

Key topics

Java DNS Caching

Networking Issues

Performance Optimization

DNS Resolution

Discussion about DNS caching issues in Java and potential solutions.

Snapshot generated from the HN discussion

Discussion Activity

Light discussion

First comment

11h

Peak period

11-12h

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Key moments

01Story posted
Aug 24, 2025 at 1:05 AM EDT
5 months ago
Step 01
02First comment
Aug 24, 2025 at 12:17 PM EDT
11h after posting
Step 02
03Peak activity
1 comments in 11-12h
Hottest window of the conversation
Step 03
04Latest activity
Aug 24, 2025 at 12:17 PM EDT
5 months ago
Step 04

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Discussion (1 comments)

Showing 1 comments

Bender

5 months ago

To my knowledge Java has always had DNS caching problems as long as Java has existed. Every company I have worked for has always disabled Java's DNS cache and also forced IPv4 due to lookup priorities causing delays since most data-center internal names are only IPv4.

In my last gig we ran an instance of Unbound DNS on each host that handled the heavy Java DNS lookup traffic and also did a better job of determining which edge DNS recursive server is the fastest and had far better retry mechanisms than those built into the OS. Unbound also empowers one with better controls over min/max TTL and flushing zones that are being updated during a maintenance window and options to optionally enable query request/answer logging to a ram disk when DNS is in question.

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ID: 45001543Type: storyLast synced: 11/18/2025, 12:03:57 AM

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