Analyzing Lock Issues

This guide will show you how to collect and analyze lock issues to report with us.


Make sure that the following applies:

  • Bash or Bash-compatible shell installed
  • BSD or GNU userland installed
  • SQLite installed
  • At least Maven 3.9.0

Prepare your environment:

  • Set Maven home to MAVEN_HOME
  • Select a lock factory, a name mapper, a parallel job count (processes), a build count and set LOCK_FACTORY, NAME_MAPPER, JOB_COUNT, BUILD_COUNT
  • Set your root working directory to ROOT
  • Set your project name with PROJECT_NAME
  • Obtain your project source into $PROJECT_NAME-1 to $PROJECT_NAME-$JOB_COUNT
  • Decide whether each job and build will have its own distinct local repository or a shared one and set it to LOCAL_REPO
  • Download schema.sql, create_lock_events.sql, create_lock_workflows.sql and set SCHEMA_FILE, CREATE_LOCK_EVENTS_FILE, CREATE_LOCK_WORKFLOWS_FILE to their respective locations

TIP: See overview of possible values for LOCK_FACTORY and NAME_MAPPER.

Running Builds

Open $JOB_COUNT terminals and change into the $ROOT/$PROJECT_NAME-1 to $ROOT/$PROJECT_NAME-$JOB_COUNT directories. Now start each job in a build loop:

$ for build in $(eval echo {1..$BUILD_COUNT}); do \
    # Only if dedicated
    rm -rf $LOCAL_REPO; \
    $MAVEN_HOME/bin/mvn clean compile -T1C -B -DskipTests -Dmaven.repo.local=$LOCAL_REPO \
    -Dorg.slf4j.simpleLogger.showThreadName=true -Dorg.slf4j.simpleLogger.showDateTime=true \ -l $LOCK_FACTORY-$NAME_MAPPER-$build.log \
    # Adjust to your needs
    -Daether.connector.basic.threads=8 -Daether.metadataResolver.threads=8 \
    # If downloads take longer consider to increase
    -Daether.syncContext.named.time=120 \
    -Daether.syncContext.named.factory=$LOCK_FACTORY -Daether.syncContext.named.nameMapper=$NAME_MAPPER; \

Wait for all jobs to complete.

TIP: If you don't need parallel (multiprocess) builds, you can set JOB_COUNT to 1.

Analyzing Builds

We now need to extract, transform and load the data (ETL) into a SQLite database.

Change back to the $ROOT directory and collect all log files with build failures:


Run extraction and transformation:

$ while read log_file; do \
    grep -e Acquiring -e Releasing -e "Failed to acquire" $log_file | \
      sed -e 's# \[#;[#g' -e 's#\] #];#' -e "s#^#$log_file;#" | \
      sed 's#\[TRACE\];##'; \

Load and process the data in SQLite:

$ SCRIPT=$(mktemp)
$ cat > $SCRIPT <<EOT
.separator ;
.import $LOCK_FACTORY-$NAME_MAPPER-locks.txt lock_history
$ sqlite3 -batch < $SCRIPT
$ rm -f $SCRIPT

Uploading Data

Compress the SQLite database as well as the log files:

$ tar -caf $LOCK_FACTORY-$NAME_MAPPER-locks.db.xz $LOCK_FACTORY-$NAME_MAPPER-locks.db
$ tar -caf $LOCK_FACTORY-$NAME_MAPPER-logfiles.tar.xz -T $BUILD_FAILURE_LIST

and upload them to the JIRA issue.