[CALCITE-6602] Deadlock while loading class SqlTypeFixture - ASF JIRA

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Details

Type: Bug
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: 1.37.0
Fix Version/s: None
Component/s: None
Labels:
None

Description

I am seeing deadlocks during initialization of interface RelDataTypeSystem and class RelDataTypeSystemImpl. The command ./gradlew :core:test --tests RelDataTypeSystemTest hangs about 90% of the time for me. Here's part of the thread dump running under JDK 21.

"ForkJoinPool-1-worker-7" #30 [1161671] daemon prio=5 os_prio=0 cpu=8.26ms elapsed=19.26s tid=0x00007d08b0000ff0 nid=1161671 waiting on condition  [0x00007d098b3fd000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.calcite.sql.type.SqlTypeFixture.<init>(SqlTypeFixture.java:28)
        - waiting on the Class initialization monitor for org.apache.calcite.rel.type.RelDataTypeSystem
        at org.apache.calcite.sql.type.RelDataTypeSystemTest$Fixture.<init>(RelDataTypeSystemTest.java:143)
        at org.apache.calcite.sql.type.RelDataTypeSystemTest.testCustomDecimalModReturnTypeInference(RelDataTypeSystemTest.java:310)
        at java.lang.invoke.LambdaForm$DMH/0x00007d0934160400.invokeVirtual(java.base@21/LambdaForm$DMH)
...
        at java.util.concurrent.ForkJoinWorkerThread.run(java.base@21/ForkJoinWorkerThread.java:188)
"ForkJoinPool-1-worker-8" #31 [1161672] daemon prio=5 os_prio=0 cpu=7.33ms elapsed=19.26s tid=0x00007d08a8000ff0 nid=1161672 waiting on condition  [0x00007d098b2fc000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.calcite.rel.type.RelDataTypeSystem.<clinit>(RelDataTypeSystem.java:38)
        - waiting on the Class initialization monitor for org.apache.calcite.rel.type.RelDataTypeSystemImpl
        at org.apache.calcite.sql.type.SqlTypeFixture.<init>(SqlTypeFixture.java:28)
        at org.apache.calcite.sql.type.RelDataTypeSystemTest$Fixture.<init>(RelDataTypeSystemTest.java:143)
        at org.apache.calcite.sql.type.RelDataTypeSystemTest.testDecimalModReturnTypeInference(RelDataTypeSystemTest.java:229)
...

Occurs in current main (commit a8802c7).

Not a high priority. Just documenting that this bug exists. Hopefully it only exists when running tests.