Add row-level claiming to prevent duplicate staged metadata processing in multi-node deployments

[Copilot]

processStagedMetadataAttributes() had no locking mechanism, allowing multiple scheduler nodes to read and process the same HPC_STAGED_METADATA_ATTRIBUTES rows concurrently — resulting in duplicate metadata writes and conflicting deletes.

Changes

• Schema: Added IN_PROCESS NUMBER(1) DEFAULT 0 NOT NULL to HPC_STAGED_METADATA_ATTRIBUTES
• DAO: getStagedMetadataAttributes() now filters WHERE IN_PROCESS = 0; new claimStagedMetadataAttribute() issues a conditional update:

  UPDATE HPC_STAGED_METADATA_ATTRIBUTES
     SET IN_PROCESS = 1
   WHERE PATH = ? AND META_ATTR_NAME = ? AND IN_PROCESS = 0

  Oracle row-level locking serializes concurrent claims — only one node updates 1 row; the other gets 0 rows and skips.
• Bus service: processStagedMetadataAttributes() claims each row before processing and skips any row already claimed by another node.

Follows the same conditional-update pattern used for HpcDataMigrationTask.IN_PROCESS elsewhere in this codebase.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• raw.github.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/HPC_DME_APIs/HPC_DME_APIs/src/hpc-server org.codehaus.plexus.classworlds.launcher.Launcher compile -pl hpc-dao-api,hpc-dao-impl,hpc-app-service-api,hpc-app-service-impl,hpc-bus-service-impl -am -q (dns block)
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.12/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.12/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.12 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.12/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/HPC_DME_APIs/HPC_DME_APIs/src org.codehaus.plexus.classworlds.launcher.Launcher -f pom.xml -B -V -e -Dfindbugs.skip -Dcheckstyle.skip -Dpmd.skip=true -Dspotbugs.skip -Denforcer.skip -Dmaven.javadoc.skip (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)