Issue with Checkpoint restore( Beam pipeline)

[Jins George]

Hi,

I am running a Beam Pipeline on Flink 1.2 and facing an issue in restoring a job from checkpoint. If I modify my beam pipeline to add a new operator and  try to restore from the externalized checkpoint, I get the error

java.lang.IllegalStateException: Invalid Invalid number of operator states. Found :56. Expected: 58
    at org.apache.flink.util.Preconditions.checkState(Preconditions.java:195)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.checkRestorePreconditions(StreamTask.java:680)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:650)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:257)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
    at java.lang.Thread.run(Thread.java:745)

From the savepoint guide [1], new operator added should be initialized without any state.  Any idea why this error is reported.

Also note, I am not setting a ID to my operator ( because Flink runner in Beam does set the operator name user provided in pipeline creation)

[1]  https://ci.apache.org/projects/flink/flink-docs-release-1.3/setup/savepoints.html


Thanks,
Jins George

[Aljoscha Krettek]

Hi,

I think you might be running into a problem that is hard to solve with Flink 1.2 and Beam. As you noticed, it's a problem that Beam doesn't assign UIDs to operators, which is a problem. Flink 1.3 and even more Flink 1.4 are a bit more lenient in accepting changes to the graph, so you might have better luck when trying it with that. Did you try using a newer Beam/Flink version? Flink 1.4 should be out next week and shortly after that I'll also update the Beam dependency.

Best,

Aljoscha 

On 29. Nov 2017, at 23:52, Jins George <[hidden email]> wrote:

Hi,

I am running a Beam Pipeline on Flink 1.2 and facing an issue in restoring a job from checkpoint. If I modify my beam pipeline to add a new operator and  try to restore from the externalized checkpoint, I get the error

java.lang.IllegalStateException: Invalid Invalid number of operator states. Found :56. Expected: 58
    at org.apache.flink.util.Preconditions.checkState(Preconditions.java:195)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.checkRestorePreconditions(StreamTask.java:680)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:650)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:257)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
    at java.lang.Thread.run(Thread.java:745)

From the savepoint guide [1], new operator added should be initialized without any state.  Any idea why this error is reported.

Also note, I am not setting a ID to my operator ( because Flink runner in Beam does set the operator name user provided in pipeline creation)

[1]  https://ci.apache.org/projects/flink/flink-docs-release-1.3/setup/savepoints.html


Thanks,
Jins George

[Jins George]

Thanks Aljoscha.  I have not tried with 1.3. I will try and check the behavior.

Regarding setting UIDs to operators from Beam, do you know if thats something planned for a near future release ?

Thanks,
Jins George

On 11/30/2017 01:48 AM, Aljoscha Krettek wrote:

Hi,

I think you might be running into a problem that is hard to solve with Flink 1.2 and Beam. As you noticed, it's a problem that Beam doesn't assign UIDs to operators, which is a problem. Flink 1.3 and even more Flink 1.4 are a bit more lenient in accepting changes to the graph, so you might have better luck when trying it with that. Did you try using a newer Beam/Flink version? Flink 1.4 should be out next week and shortly after that I'll also update the Beam dependency.

Best,

Aljoscha 

On 29. Nov 2017, at 23:52, Jins George <[hidden email]> wrote:

Hi,

I am running a Beam Pipeline on Flink 1.2 and facing an issue in restoring a job from checkpoint. If I modify my beam pipeline to add a new operator and  try to restore from the externalized checkpoint, I get the error

java.lang.IllegalStateException: Invalid Invalid number of operator states. Found :56. Expected: 58
    at org.apache.flink.util.Preconditions.checkState(Preconditions.java:195)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.checkRestorePreconditions(StreamTask.java:680)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:650)
    at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:257)
    at org.apache.flink.runtime.taskmanager.Task.run(Task.java:655)
    at java.lang.Thread.run(Thread.java:745)

From the savepoint guide [1], new operator added should be initialized without any state.  Any idea why this error is reported.

Also note, I am not setting a ID to my operator ( because Flink runner in Beam does set the operator name user provided in pipeline creation)

[1]  https://ci.apache.org/projects/flink/flink-docs-release-1.3/setup/savepoints.html


Thanks,
Jins George