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https://issues.apache.org/jira/browse/HDDS-10275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17814522#comment-17814522
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Hemant Kumar commented on HDDS-10275:
-------------------------------------
Possible related to https://issues.apache.org/jira/browse/HDDS-9871
> Double buffer not flushing DB transactions
> ------------------------------------------
>
> Key: HDDS-10275
> URL: https://issues.apache.org/jira/browse/HDDS-10275
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Hemant Kumar
> Priority: Major
>
> While looking into snapshot diff failure because it could not load the
> snapshot because checkpointing dir doesn’t exist. Snapshot creation succeeded
> but checkpointing dir doesn’t exist because it happens inside double buffed
> flush.
> Looked at logs and there was no double buffer flush logs during that time.
> Snapshot creation request:
> {code:java}
> 2023-11-27 00:40:23,345 INFO [OM StateMachine ApplyTransaction Thread -
> 0]-org.apache.hadoop.ozone.om.request.snapshot.OMSnapshotCreateRequest:
> Created snapshot: 'snap-ay36z' with snapshotId:
> 'bf0c6141-4185-4361-b15f-c4aa71c5c6d8' under path 'vol-2xd36/buck-id806'
> {code}
> Double Buffer flush logs:
> {code:java}
> ...
> 2023-11-27 00:10:23,826 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointManager:
> Created checkpoint in rocksDB at
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-b2e9acb3-fee2-4190-8272-0649edca8d93
> in 30 milliseconds
> 2023-11-27 00:10:23,827 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointUtils:
> Waited for 1 milliseconds for checkpoint directory
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-b2e9acb3-fee2-4190-8272-0649edca8d93
> availability.
> 2023-11-27 00:10:23,828 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.ozone.om.OmSnapshotManager:
> Created checkpoint :
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-b2e9acb3-fee2-4190-8272-0649edca8d93
> for snapshot snap-mswq9
> 2023-11-27 00:10:39,586 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointManager:
> Created checkpoint in rocksDB at
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-3369ac3a-61e1-4eca-b3cf-eb2de0b2d688
> in 30 milliseconds
> 2023-11-27 00:10:39,586 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointUtils:
> Waited for 0 milliseconds for checkpoint directory
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-3369ac3a-61e1-4eca-b3cf-eb2de0b2d688
> availability.
> 2023-11-27 00:10:39,587 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.ozone.om.OmSnapshotManager:
> Created checkpoint :
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-3369ac3a-61e1-4eca-b3cf-eb2de0b2d688
> for snapshot snap-f5u3t
> 2023-11-27 00:10:55,949 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointManager:
> Created checkpoint in rocksDB at
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-3a690c8f-f3ef-415d-b25c-3aaf763c9507
> in 22 milliseconds
> 2023-11-27 00:10:55,950 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointUtils:
> Waited for 1 milliseconds for checkpoint directory
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-3a690c8f-f3ef-415d-b25c-3aaf763c9507
> availability.
> 2023-11-27 00:10:55,950 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.ozone.om.OmSnapshotManager:
> Created checkpoint :
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-3a690c8f-f3ef-415d-b25c-3aaf763c9507
> for snapshot snap-jfktn
> 2023-11-29 08:52:24,698 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointManager:
> Created checkpoint in rocksDB at
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-c3ba17ef-d947-454e-9c4f-b9063ae65650
> in 15 milliseconds
> 2023-11-29 08:52:24,715 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointUtils:
> Waited for 16 milliseconds for checkpoint directory
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-c3ba17ef-d947-454e-9c4f-b9063ae65650
> availability.
> 2023-11-29 08:52:24,717 WARN
> [OMDoubleBufferFlushThread]-org.apache.hadoop.ozone.om.OmSnapshotManager:
> Took 614733 ns to find endKey. Caller is
> deleteKeysFromDelKeyTableInSnapshotScope
> 2023-11-29 08:52:24,718 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.ozone.om.OmSnapshotManager:
> Created checkpoint :
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-c3ba17ef-d947-454e-9c4f-b9063ae65650
> for snapshot snap-ay36z
> 2023-11-29 08:52:24,745 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointManager:
> Created checkpoint in rocksDB at
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-bf0c6141-4185-4361-b15f-c4aa71c5c6d8
> in 12 milliseconds
> 2023-11-29 08:52:24,746 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.hdds.utils.db.RDBCheckpointUtils:
> Waited for 0 milliseconds for checkpoint directory
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-bf0c6141-4185-4361-b15f-c4aa71c5c6d8
> availability.
> 2023-11-29 08:52:24,747 INFO
> [OMDoubleBufferFlushThread]-org.apache.hadoop.ozone.om.OmSnapshotManager:
> Created checkpoint :
> /var/lib/hadoop-ozone/om/data035525/db.snapshots/checkpointState/om.db-bf0c6141-4185-4361-b15f-c4aa71c5c6d8
> for snapshot snap-ay36z
> ...
> {code}
> Also looked if double buffer thread was terminated or paused but no log
> exists for that as well. I looked at the logs for the whole hour between last
> double buffer flush and check-pointing was not created. Couldn’t find any
> issue in that as well.
> On follower nodes, double buffer were working properly.
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