Hi Fabian,
I added some trace logs in ProcTimeBoundedRangeOver and think it should be a
bug. The log should explain how cleanup_time_1 bypasses the needToCleanupState
check and causes NPE. A jira ticket [1] is created.
Best
Yan
[ts:1528149296456] [label:state_ttl_update] register for cleanup at
1528150096456(CLEANUP_TIME_1), because of Row:(orderId:001,userId:U123)
[ts:1528149296456] [label:register_pt] register for process input at
1528149296457, because of Row:(orderId:001,userId:U123)
[ts:1528149296458] [label:state_apply] ontimer at 1528149296457, apply
Row:(orderId:001,userId:U123) to accumulator
[ts:1528149885813] [label:state_ttl_update] register at
1528150685813(CLEANUP_TIME_2), because of Row:(orderId:002,userId:U123)
[ts:1528149885813] [label:register_pt] register for process input at
1528149885814, because of Row:(orderId:002,userId:U123)
[ts:1528149885814] [label:state_apply] ontimer at 1528149885814, apply
Row:(orderId:002,userId:U123) to accumulator
[ts:1528150096460] [label:NO_ELEMENTS_IN_STATE] ontimer at
1528150096456(CLEANUP_TIME_1), bypass needToCleanupState check, however
rowMapState is {key:1528150096455, value:[]}
[ts:1528150685815] [label:state_timeout] ontimer at
1528150685813(CLEANUP_TIME_2), clean/empty the rowMapState [{key:1528149885813,
value:[Row:(orderId:002,userId:U123)]}]
[1] : https://issues.apache.org/jira/browse/FLINK-9524
________________________________
From: Yan Zhou [FDS Science] <[email protected]>
Sent: Monday, June 4, 2018 4:05 PM
To: Fabian Hueske
Cc: Dawid Wysakowicz; user
Subject: Re: NPE in flink sql over-window
Hi Fabian,
Yes, the NPE cause the job failure and recovery( instead of being the result of
a recovery).
And yet, during the recovery, the same exceptions are thrown from same line.
Best
Yan
________________________________
From: Fabian Hueske <[email protected]>
Sent: Thursday, May 31, 2018 12:09:03 AM
To: Yan Zhou [FDS Science]
Cc: Dawid Wysakowicz; user
Subject: Re: NPE in flink sql over-window
Hi Yan,
Thanks for the details and for digging into the issue.
If I got it right, the NPE caused the job failure and recovery (instead of
being the result of a recovery), correct?
Best, Fabian
2018-05-31 7:00 GMT+02:00 Yan Zhou [FDS Science]
<[email protected]<mailto:[email protected]>>:
Thanks for the replay.
Yes, it only happen if I config the idle state retention times. The error
occurs the first time before the first recovery. I haven't run with proctime
but rowtime in flink 1.4.x. I am not sure if it will cause problems with
proctime in 1.4.x.
I am adding some trace log for ProcTimeBoundedRangeOver. I will update with my
test result and fire a JIRA after that.
Best
Yan
________________________________
From: Fabian Hueske <[email protected]<mailto:[email protected]>>
Sent: Wednesday, May 30, 2018 1:43:01 AM
To: Dawid Wysakowicz
Cc: user
Subject: Re: NPE in flink sql over-window
Hi,
Dawid's analysis is certainly correct, but looking at the code this should not
happen.
I have a few questions:
- You said this only happens if you configure idle state retention times, right?
- Does the error occur the first time without a previous recovery?
- Did you run the same query on Flink 1.4.x without any problems?
Thanks, Fabian
2018-05-30 9:25 GMT+02:00 Dawid Wysakowicz
<[email protected]<mailto:[email protected]>>:
Hi Yan,
I think it is a bug in the ProcTimeBoundedRangeOver. It tries to access a list
of elements that was already cleared and does not check against null. Could you
please file a JIRA for that?
Best,
Dawid
On 30/05/18 08:27, Yan Zhou [FDS Science] wrote:
I also get warnning that CodeCache is full around that time. It's printed by
JVM and doesn't have timestamp. But I suspect that it's because so many failure
recoveries from checkpoint and the sql queries are dynamically compiled too
many times.
Java HotSpot(TM) 64-Bit Server VM warning: CodeCache is full. Compiler has been
disabled.
Java HotSpot(TM) 64-Bit Server VM warning: Try increasing the code cache size
using -XX:ReservedCodeCacheSize=
CodeCache: size=245760Kb used=244114Kb max_used=244146Kb free=1645Kb
bounds [0x00007fa4fd000000, 0x00007fa50c000000, 0x00007fa50c000000]
total_blobs=54308 nmethods=53551 adapters=617
compilation: disabled (not enough contiguous free space left)
________________________________
From: Yan Zhou [FDS Science] <[email protected]><mailto:[email protected]>
Sent: Tuesday, May 29, 2018 10:52:18 PM
To: [email protected]<mailto:[email protected]>
Subject: NPE in flink sql over-window
Hi,
I am using flink sql 1.5.0. My application throws NPE. And after it recover
from checkpoint automatically, it throws NPE immediately from same line of code.
My application read message from kafka, convert the datastream into a table,
issue an Over-window aggregation and write the result into a sink. NPE throws
from class ProcTimeBoundedRangeOver. Please see exception log at the bottom.
The exceptions always happens after the application started for
maxIdleStateRetentionTime time. What could be the possible causes?
Best
Yan
2018-05-27 11:03:37,656 INFO org.apache.flink.runtime.taskmanager.Task
- over: (PARTITION BY: uid, ORDER BY: proctime, RANGEBETWEEN
86400000 PRECEDI
NG AND CURRENT ROW, select: (id, uid, proctime, group_concat($7) AS w0$o0)) ->
select:
(id, uid, proctime, w0$o0 AS EXPR$3) -> to: Row -> Flat Map -> Filter -> Sink:
Unnamed (3/15) (327
efe96243bbfdf1f1e40a3372f64aa) switched from RUNNING to FAILED.
TimerException{java.lang.NullPointerException}
at
org.apache.flink.streaming.runtime.tasks.SystemProcessingTimeService$TriggerTask.run(SystemProcessingTimeService.java:284)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at
org.apache.flink.table.runtime.aggregate.ProcTimeBoundedRangeOverWithLog.onTimer(ProcTimeBoundedRangeOver.scala:181)
at
org.apache.flink.streaming.api.operators.LegacyKeyedProcessOperator.invokeUserFunction(LegacyKeyedProcessOperator.java:97)
at
org.apache.flink.streaming.api.operators.LegacyKeyedProcessOperator.onProcessingTime(LegacyKeyedProcessOperator.java:81)
at
org.apache.flink.streaming.api.operators.HeapInternalTimerService.onProcessingTime(HeapInternalTimerService.java:266)
at
org.apache.flink.streaming.runtime.tasks.SystemProcessingTimeService$TriggerTask.run(SystemProcessingTimeService.java:281)
