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https://issues.apache.org/jira/browse/HDDS-12151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-12151:
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Labels: pull-request-available (was: )
> Check every single write operation on an Ozone datanode is handled correctly
> in the case of full volumes
> --------------------------------------------------------------------------------------------------------
>
> Key: HDDS-12151
> URL: https://issues.apache.org/jira/browse/HDDS-12151
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Siyao Meng
> Assignee: Sumit Agrawal
> Priority: Major
> Labels: pull-request-available
>
> We observed cases where full Ozone volumes (reserved space also gone.
> StorageVolumeChecker throwing "java.io.IOException: No space left on device")
> could lead to complications like container state divergence, where a
> container could end up having replicas with different contents (blocks).
> Even if we had {{hdds.datanode.dir.du.reserved}} or
> {{hdds.datanode.dir.du.reserved.percent}} , it doesn't seem to be fully
> respected by the datanode itself because we have seen some volumes with 0
> bytes left. Plus, we couldn't control what other potential applications could
> have done to the volume mount.
> ----
> List of Ozone datanode write operations (including Ratis ones) that needs to
> be checked on top of my head:
> 1. Ratis log append -- located under
> {{dfs.container.ratis.datanode.storage.dir}} . when the mount is full, the
> Ratis server would shut down (the datanode might also shut down with it)
> 2. WriteChunk
> 3. Container metadata file update
> 4. Container RocksDB update
> 5. StorageVolumeChecker canary -- interval controlled by
> hdds.datanode.periodic.disk.check.interval.minutes
> {code:title=Example of IOException: No space left on device thrown from
> disk/volume checker}
> 2025-01-21 14:45:07,165 ERROR [DataNode DiskChecker thread
> 15]-org.apache.hadoop.ozone.container.common.utils.DiskCheckUtil: Volume
> /mnt/volume12/hadoop-ozone/datanode/data/hdds failed health check. Could not
> write file
> /mnt/volume12/hadoop-ozone/datanode/data/hdds/CID-3d4afb70-9e42-4b56-8867-25fcd933f205/tmp/disk-check/disk-check-2a25d962-40cb-4ec8-8f0f-708853dccb7e
> for volume check.
> java.io.IOException: No space left on device
> at java.io.FileOutputStream.writeBytes(Native Method)
> at java.io.FileOutputStream.write(FileOutputStream.java:313)
> at
> org.apache.hadoop.ozone.container.common.utils.DiskCheckUtil$DiskChecksImpl.checkReadWrite(DiskCheckUtil.java:138)
> at
> org.apache.hadoop.ozone.container.common.utils.DiskCheckUtil.checkReadWrite(DiskCheckUtil.java:66)
> at
> org.apache.hadoop.ozone.container.common.volume.StorageVolume.check(StorageVolume.java:641)
> at
> org.apache.hadoop.ozone.container.common.volume.HddsVolume.check(HddsVolume.java:259)
> at
> org.apache.hadoop.ozone.container.common.volume.HddsVolume.check(HddsVolume.java:68)
> at
> org.apache.hadoop.ozone.container.common.volume.ThrottledAsyncChecker.lambda$schedule$0(ThrottledAsyncChecker.java:143)
> at
> com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:131)
> at
> com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:75)
> at
> com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:82)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> 6. datanode log append (typically on a different volume tho)
> 7. During schema v3 container replication, metadata DB is first dumped to an
> external file on the source node -- seen in
> [KeyValueContainer#packContainerToDestination|https://github.com/apache/ozone/blob/189a9fe42013e82f93becaede627e509322c38f6/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/KeyValueContainer.java#L1012].
> Note the blocks looks to be streamed over to the destination directly.
> ----
> We have to make sure any of those operations would handle the "disk full" /
> "no space left" situation gracefully. The goal is to make sure issues like
> container replica divergence won't happen again.
> [~erose]
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