gezero opened a new issue #345:
URL: https://github.com/apache/incubator-tuweni/issues/345
When the DNSDiscovery in Besu was turned on I got several of the stacktraces
in my log of the following type:
```
2021-11-11 13:16:07.530+00:00 | Timer-0 | WARN | DNSResolver | I/O
exception contacting remote DNS server /8.8.8.8:53
java.io.EOFException
at
org.xbill.DNS.NioTcpClient$ChannelState.processRead(NioTcpClient.java:169)
at
org.xbill.DNS.NioTcpClient$ChannelState.processReadyKey(NioTcpClient.java:126)
at org.xbill.DNS.NioClient.processReadyKeys(NioClient.java:143)
at org.xbill.DNS.NioClient.runSelector(NioClient.java:118)
at java.base/java.lang.Thread.run(Thread.java:829)
```
After investigating the code a little bit I noticed that the code in
`DNSResolver`
* does not rate limit calls
* does not handle the exception sensibly - ignoring the subtree of the
merkle tree where the failure happened
* swallows the domain name and prints a warning without even telling what
domain name failed
When i tried to debug the issue it seemed that waiting some time before
requests allowed me to retrieve all the data properly so I suspect the DNS just
returned an empty response from time to time when it got hammered with
requests.
### Versions
Java version: [openjdk version "11.0.11" 2021-04-20]
OS Name & Version: [`Ubuntu 20.04 LTS as WSL under Windows 10]
### Related Besu issue:
https://github.com/hyperledger/besu/issues/3044
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