CRIU restore clears InetAddress.cache

[JasonFengJ9]

CRIU restore clears InetAddress.cache

A post-restore hook clearInetAddressCache() is added to clear InetAddress.cache.

This change prevents JVM DNS cache before checkpoint which might cause DNS resolution timeout after the CRIU image is restored at a different environment.
Related

• CRIU restore clears InetAddress.cache ibmruntimes/openj9-openjdk-jdk#604

Signed-off-by: Jason Feng [email protected]

[tajila]

Can we just clear the cache with the restore hook? in java.net.InetAddress

private static final ConcurrentMap<String, Addresses> cache =
        new ConcurrentHashMap<>();

private static final NavigableSet<CachedAddresses> expirySet =
        new ConcurrentSkipListSet<>();

[JasonFengJ9]

Good catch, I thought the mapping caches are saved in InetAddress instances, will change it.

[JasonFengJ9]

@tajila this is ready for another look.

[tajila]

jenkins test sanity xlinux jdknext depends ibmruntimes/openj9-openjdk-jdk#604

[tajila]

jenkins test sanity xlinux jdk17 depends ibmruntimes/openj9-openjdk-jdk17/pull/216

[JasonFengJ9]

JDK17 build error

ERROR: Cannot parse dependent change: 'ibmruntimes/openj9-openjdk-jdk17/pull/216'

It seems to expect the format ibmruntimes/openj9-openjdk-jdk17#216

[tajila]

jenkins test sanity xlinux jdk17 depends https://github.com/ibmruntimes/openj9-openjdk-jdk17#216

[tajila]

jenkins test sanity xlinux jdk11 depends https://github.com/ibmruntimes/openj9-openjdk-jdk11#661

[tajila]

jenkins test sanity xlinux jdk17 ibmruntimes/openj9-openjdk-jdk17#216

[tajila]

jenkins test sanity xlinux jdk11 depends ibmruntimes/openj9-openjdk-jdk11#661

[tajila]

11:57:57  ERROR: Build failed for target 'all' in configuration 'linux-x86_64-server-release' (exit code 2) 
11:57:57  
11:57:57  === Output from failing command(s) repeated here ===
11:57:57  * For target jdk_modules_openj9.criu__the.openj9.criu_batch:
11:57:57  /home/jenkins/workspace/Build_JDK17_x86-64_linux_Personal/build/linux-x86_64-server-release/support/j9jcl/openj9.criu/share/classes/org/eclipse/openj9/criu/CRIUSupport.java:624: error: cannot find symbol
11:57:57  		SharedSecrets.getJavaNetInetAddressAccess().clearInetAddressCache();

on the jdk17 build

[JasonFengJ9]

error: cannot find symbol
SharedSecrets.getJavaNetInetAddressAccess().clearInetAddressCache();
on the jdk17 build

It passed at https://openj9-jenkins.osuosl.org/job/Build_JDK17_x86-64_linux_Personal/554/
I think jenkins test sanity xlinux jdk17 https://github.com/ibmruntimes/openj9-openjdk-jdk17/pull/216 missed depends.

[tajila]

oh yes, thanks