Thomas Wozniakowski created FLINK-10184:
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Summary: HA Failover broken due to JobGraphs not being removed
from Zookeeper on cancel
Key: FLINK-10184
URL: https://issues.apache.org/jira/browse/FLINK-10184
Project: Flink
Issue Type: Bug
Components: Distributed Coordination
Affects Versions: 1.5.2
Reporter: Thomas Wozniakowski
We have encountered a blocking issue when upgrading our cluster to 1.5.2.
It appears that, when jobs are cancelled manually (in our case with a
savepoint), the JobGraphs are NOT removed from the Zookeeper {{jobgraphs}} node.
This means that, if you start a job, cancel it, restart it, cancel it, etc. You
will end up with many job graphs stored in zookeeper, but none of the
corresponding blobs in the Flink HA directory.
When a HA failover occurs, the newly elected leader retrieves all of those old
JobGraph objects from Zookeeper, then goes looking for the corresponding blobs
in the HA directory. The blobs are not there so the JobManager explodes and the
process dies.
At this point the cluster has to be fully stopped, the zookeeper jobgraphs
cleared out by hand, and all the jobmanagers restarted.
I can see the following line in the JobManager logs:
{{ 2018-08-20 16:17:20,776 INFO
org.apache.flink.runtime.jobmanager.ZooKeeperSubmittedJobGraphStore - Removed
job graph 4e9a5a9d70ca99dbd394c35f8dfeda65 from ZooKeeper.
}}
But looking in Zookeeper the {{4e9a5a9d70ca99dbd394c35f8dfeda65}} job is still
very much there.
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