OK this happened again and it is bizarre ( and is definitely not what I think should happen )
The job failed and I see these logs ( In essence it is keeping the last 5 externalized checkpoints ) but deleting the zk checkpoints directory *06.28.2019 20:33:13.738 2019-06-29 00:33:13,736 INFO org.apache.flink.runtime.checkpoint.CompletedCheckpoint - Checkpoint with ID 5654 at 'xxxxxxxxxx:8020/analytics_eng/kafka-to-hdfs-states/00000000000000000000000000000005/chk-5654' not discarded. 06.28.2019 20:33:13.788 2019-06-29 00:33:13,786 INFO org.apache.flink.runtime.checkpoint.CompletedCheckpoint - Checkpoint with ID 5655 at 'xxxxxxxxxx:8020/analytics_eng/kafka-to-hdfs-states/00000000000000000000000000000005/chk-5655' not discarded. 06.28.2019 20:33:13.838 2019-06-29 00:33:13,836 INFO org.apache.flink.runtime.checkpoint.CompletedCheckpoint - Checkpoint with ID 5656 at 'xxxxxxxxxx8020/analytics_eng/kafka-to-hdfs-states/00000000000000000000000000000005/chk-5656' not discarded. 06.28.2019 20:33:13.888 2019-06-29 00:33:13,886 INFO org.apache.flink.runtime.checkpoint.CompletedCheckpoint - Checkpoint with ID 5657 at 'xxxxxxxxxx:8020/analytics_eng/kafka-to-hdfs-states/00000000000000000000000000000005/chk-5657' not discarded. 06.28.2019 20:33:13.938 2019-06-29 00:33:13,936 INFO org.apache.flink.runtime.checkpoint.CompletedCheckpoint - Checkpoint with ID 5658 at 'xxxxxxxxxx8020/analytics_eng/kafka-to-hdfs-states/00000000000000000000000000000005/chk-5658' not discarded. 06.28.2019 20:33:13.938 2019-06-29 00:33:13,936 INFO org.apache.flink.runtime.zookeeper.ZooKeeperStateHandleStore - Removing /kafka-to-hdfs-v2/kafka-to-hdfs-v2/k8s/checkpoints/00000000000000000000000000000005 from ZooKeeper* The job restarts and this is bizzare. It does not find the ZK checkpoint directory but instead of going to the state.checkpoints.dir to get it's last checkpoint, it restarts from a save point that we started this job with ( resetting the checkpoint id ) like about 15 days ago * 06.28.2019 20:33:20.047 2019-06-29 00:33:20,045 INFO org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore - Recovering checkpoints from ZooKeeper. 06.28.2019 20:33:20.053 2019-06-29 00:33:20,051 INFO org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore - Trying to fetch 0 checkpoints from storage. 06.28.2019 20:33:20.053 2019-06-29 00:33:20,051 INFO org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore - Found 0 checkpoints in ZooKeeper. 06.28.2019 20:33:20.054 2019-06-29 00:33:20,053 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Starting job 00000000000000000000000000000005 from savepoint hdfs://nn-crunchy:8020/flink-savepoints_k8s/prod/kafka-to-hdfs/savepoint-000000-128f419cdc6f () 06.28.2019 20:33:20.540 2019-06-29 00:33:20,538 INFO org.apache.flink.runtime.checkpoint.CheckpointCoordinator - Reset the checkpoint ID of job 00000000000000000000000000000005 to 4203. 06.28.2019 20:33:20.540 2019-06-29 00:33:20,538 INFO org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore - Recovering checkpoints from ZooKeeper. 06.28.2019 20:33:20.550 2019-06-29 00:33:20,549 INFO org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore - Trying to retrieve checkpoint 4202. 06.28.2019 20:33:20.550 2019-06-29 00:33:20,548 INFO org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore - Found 1 checkpoints in ZooKeeper. 06.28.2019 20:33:20.550 2019-06-29 00:33:20,549 INFO org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore - Trying to fetch 1 checkpoints from storage.* This just does not make sense.... On Wed, Jun 5, 2019 at 9:29 AM Vishal Santoshi <vishal.santo...@gmail.com> wrote: > Ok, I will do that. > > On Wed, Jun 5, 2019, 8:25 AM Chesnay Schepler <ches...@apache.org> wrote: > >> Can you provide us the jobmanager logs? >> >> After the first restart the JM should have started deleting older >> checkpoints as new ones were created. >> After the second restart the JM should have recovered all 10 checkpoints, >> start from the latest, and start pruning old ones as new ones were created. >> >> So you're running into 2 separate issues here, which is a bit odd. >> >> On 05/06/2019 13:44, Vishal Santoshi wrote: >> >> Any one? >> >> On Tue, Jun 4, 2019, 2:41 PM Vishal Santoshi <vishal.santo...@gmail.com> >> wrote: >> >>> The above is flink 1.8 >>> >>> On Tue, Jun 4, 2019 at 12:32 PM Vishal Santoshi < >>> vishal.santo...@gmail.com> wrote: >>> >>>> I had a sequence of events that created this issue. >>>> >>>> * I started a job and I had the state.checkpoints.num-retained: 5 >>>> >>>> * As expected I have 5 latest checkpoints retained in my hdfs backend. >>>> >>>> >>>> * JM dies ( K8s limit etc ) without cleaning the hdfs directory. The >>>> k8s job restores from the latest checkpoint ( I think ) but as it creates >>>> new checkpoints it does not delete the older chk point. At the end there >>>> are now 10 chkpoints, 5 from the old run which remain static and 5 latest >>>> representing the on going pipe. >>>> >>>> * The JM dies again and restart from the latest from the 5 old >>>> checkpoints. >>>> >>>> This looks a bug in the Job Cluster implementation of flink. It looks >>>> like it is taking the 5th checkpoint from the beginning based on >>>> num-retained value, Note that it has the same job id and does not scope to >>>> a new directory. >>>> >>>> >>>> https://github.com/apache/flink/blob/1dfdaa417ab7cdca9bef1efe6381c7eb67022aaf/flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/ZooKeeperCompletedCheckpointStore.java#L109 >>>> >>>> Please tell me if this does not make sense. >>>> >>>> Vishal >>>> >>>> >>>> >>>> >>>> >>>> >>
