Aleksey Plekhanov created IGNITE-28623:
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Summary: Calcite engine. Query iterator can be prematurely closed,
before returning result to the user
Key: IGNITE-28623
URL: https://issues.apache.org/jira/browse/IGNITE-28623
Project: Ignite
Issue Type: Bug
Reporter: Aleksey Plekhanov
Assignee: Aleksey Plekhanov
Calcite engine uses reference tracking to determine if there are no more
references to iterator and query can be closed (see
{{ClosableIteratorsHolder}}), but sometimes query can be closed prematurely if
there are already no references to iterator, but delegating iterator still
process data.
For example, calls like {{cache.query(qry).iterator().next()}} (create
iterator, don't store it, use one delegate call) can fail in case of concurrent
GC.
This issue also reproduced in test:
{{SqlPlanHistoryIntegrationTest.testDefaultHistorySize[sqlEngine=calcite,
isClient=false loc=false, isFullyFetched=false, isPerfStatsEnabled=false]}}
With error:
{noformat}
class org.apache.ignite.internal.processors.query.IgniteSQLException: An error
occurred while query executing - The query was cancelled while executing.
at
org.apache.ignite.internal.processors.query.calcite.exec.rel.RootNode.checkException(RootNode.java:325)
at
org.apache.ignite.internal.processors.query.calcite.exec.rel.RootNode.exchangeBuffers(RootNode.java:314)
at
org.apache.ignite.internal.processors.query.calcite.exec.rel.RootNode.hasNext(RootNode.java:213)
at
org.apache.ignite.internal.processors.query.calcite.exec.rel.RootNode.next(RootNode.java:220)
at
org.apache.ignite.internal.processors.query.calcite.util.ConvertingClosableIterator.next(ConvertingClosableIterator.java:78)
at
org.apache.ignite.internal.processors.query.calcite.util.ConvertingClosableIterator.next(ConvertingClosableIterator.java:33)
at
org.apache.ignite.internal.processors.query.calcite.exec.ClosableIteratorsHolder$DelegatingIterator.next(ClosableIteratorsHolder.java:149)
at
org.apache.ignite.internal.processors.query.calcite.integration.SqlPlanHistoryIntegrationTest.cacheQuery(SqlPlanHistoryIntegrationTest.java:650)
at
org.apache.ignite.internal.processors.query.calcite.integration.SqlPlanHistoryIntegrationTest.checkDefaultHistorySize(SqlPlanHistoryIntegrationTest.java:857)
at
org.apache.ignite.internal.processors.query.calcite.integration.SqlPlanHistoryIntegrationTest.testDefaultHistorySize(SqlPlanHistoryIntegrationTest.java:504)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.apache.ignite.testframework.junits.GridAbstractTest$6.run(GridAbstractTest.java:2486)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: class
org.apache.ignite.internal.processors.query.IgniteSQLException: The query was
cancelled while executing.
at
org.apache.ignite.internal.processors.query.calcite.exec.rel.RootNode.close(RootNode.java:119)
at
org.apache.ignite.internal.processors.query.calcite.util.Commons.close(Commons.java:337)
at
org.apache.ignite.internal.processors.query.calcite.util.ConvertingClosableIterator.close(ConvertingClosableIterator.java:95)
at
org.apache.ignite.internal.util.CommonUtils.close(CommonUtils.java:1000)
at
org.apache.ignite.internal.processors.query.calcite.util.Commons.close(Commons.java:345)
at
org.apache.ignite.internal.processors.query.calcite.exec.ClosableIteratorsHolder.cleanUp(ClosableIteratorsHolder.java:86)
at
org.apache.ignite.internal.processors.query.calcite.exec.ClosableIteratorsHolder.lambda$init$0(ClosableIteratorsHolder.java:71)
... 1 more
Caused by: class org.apache.ignite.cache.query.QueryCancelledException: The
query was cancelled while executing.
... 8 more
{noformat}
And fails on TC: https://ci2.ignite.apache.org/viewLog.html?buildId=9034083
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