Batch problem with Spring Batch + Neo4j

[Gwendal Mousset]

Hi,

I've got a problem with Neo4j 2.0.0.M06 + SDN 3.0.0.M1 + Spring Batch 2.2.3

I configured a job that select users in a Neo4j database, perform a very simple operation in the ItemProcessor class and write the result.

The batch starts normally and works until it seems to be freeze or blocked after it processes 2 chunks.

The last line logged is : 

DEBUG: org.springframework.batch.core.step.item.ChunkOrientedTasklet - Inputs not busy, ended: false

Is there anybody here who have encountered this problem ?

I joined the configuration and the logs files.

Thanks

[vincent fraboulet]

Hi,

I have the same problem, but no issue.

Help?

[Michael Hunger]

Can you share what your batch jobs do? I.e. code?

Also a threaddump of the JVM would be helpful.

Michael

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[Michael Hunger]

How many user do you have in your db?

START n=node(0) MATCH (user:User) WHERE user.isSubscriber=true RETURN user ORDER BY user.totalCoins SKIP 20 LIMIT 20

This statement is also not correct.

MATCH (user:User) WHERE user.isSubscriber=true RETURN user ORDER BY user.totalCoins SKIP 20 LIMIT 20

Make sure to have an index like this:

create index on :User(isSubscriber)

Michael

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<batch-logs.txt><batch-conf.xml>

[Gwendal Mousset]

Hi,

I've found the solution to this issue.

With Neo4j used with server, I have to modify default transaction manager configuration and add this to tasklet conf:

<batch:transaction-attributes isolation="DEFAULT" propagation="NOT_SUPPORTED" />

For the query, Spring Batch neo4j item reader required to specify a START statement. 

I copy/past the class org.springframework.batch.item.data.Neo4jItemReader and in my own class and override methods to make START statement optional.

Thanks,

[Michael Hunger]

Oh I didn't know there was a Neo4jItemReader in Spring batch.

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