Julian Hyde created CALCITE-1594:
------------------------------------
Summary: Test suite hangs, with many threads in
ConventionTraitDef.getConversionData and waiting to lock a WeakHashMap
Key: CALCITE-1594
URL: https://issues.apache.org/jira/browse/CALCITE-1594
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
Test suite hangs with several threads in {{WeakHashMap.get}}, all called from
{{ConventionTraitDef.getConversionData}} and using the same table.
It is not a deadlock; all but one threads are waiting for a lock, but the
thread that has the lock and is runnable.
Abbreviated stack trace:
{noformat}
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.72-b15 mixed mode):
...
"pool-1-thread-7" #20 daemon prio=5 os_prio=0 tid=0x00007f3cf4003000 nid=0x1f12
runnable [0x00007f3d3f8f4000]
java.lang.Thread.State: RUNNABLE
at java.util.WeakHashMap.expungeStaleEntries(WeakHashMap.java:341)
- locked <0x00000000a08d14a8> (a java.lang.ref.ReferenceQueue)
at java.util.WeakHashMap.getTable(WeakHashMap.java:350)
at java.util.WeakHashMap.get(WeakHashMap.java:397)
at
org.apache.calcite.plan.ConventionTraitDef.getConversionData(ConventionTraitDef.java:203)
at
org.apache.calcite.plan.ConventionTraitDef.convert(ConventionTraitDef.java:129)
at
org.apache.calcite.plan.ConventionTraitDef.convert(ConventionTraitDef.java:46)
at
org.apache.calcite.plan.volcano.VolcanoPlanner.changeTraitsUsingConverters(VolcanoPlanner.java:1197)
...
"pool-1-thread-8" #19 daemon prio=5 os_prio=0 tid=0x00007f3cec001000 nid=0x1f11
waiting for monitor entry [0x00007f3d3f9f5000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.util.WeakHashMap.expungeStaleEntries(WeakHashMap.java:319)
- waiting to lock <0x00000000a08d14a8> (a java.lang.ref.ReferenceQueue)
at java.util.WeakHashMap.getTable(WeakHashMap.java:350)
at java.util.WeakHashMap.get(WeakHashMap.java:397)
at
org.apache.calcite.plan.ConventionTraitDef.getConversionData(ConventionTraitDef.java:203)
at
org.apache.calcite.plan.ConventionTraitDef.convert(ConventionTraitDef.java:129)
at
org.apache.calcite.plan.ConventionTraitDef.convert(ConventionTraitDef.java:46)
at
org.apache.calcite.plan.volcano.VolcanoPlanner.changeTraitsUsingConverters(VolcanoPlanner.java:1197)
...
"pool-1-thread-6" #17 daemon prio=5 os_prio=0 tid=0x00007f3ce8001000 nid=0x1f0f
waiting for monitor entry [0x00007f3d3fbf8000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.util.WeakHashMap.expungeStaleEntries(WeakHashMap.java:319)
- waiting to lock <0x00000000a08d14a8> (a java.lang.ref.ReferenceQueue)
at java.util.WeakHashMap.getTable(WeakHashMap.java:350)
at java.util.WeakHashMap.get(WeakHashMap.java:397)
at
org.apache.calcite.plan.ConventionTraitDef.getConversionData(ConventionTraitDef.java:203)
...
{noformat}
Hypothesis: we should be synchronizing access to
{{ConventionTraitDef.plannerConversionMap}}.
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