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Posted to issues@ozone.apache.org by "Hanisha Koneru (Jira)" <ji...@apache.org> on 2022/01/27 23:19:00 UTC
[jira] [Commented] (HDDS-5359) Incorrect BLOCKCOUNT and BYTESUSED in container DB
[ https://issues.apache.org/jira/browse/HDDS-5359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17483468#comment-17483468 ]
Hanisha Koneru commented on HDDS-5359:
--------------------------------------
The BlockCount is incremented only when the Stream is closed and not when the BlockID is added to the DB. If the OutputStream was not closed properly or if, for any reason, the client starts writing to a new pipeline before the full block is written, it could lead to a Block being present in the container but the _key_count_ (BlockCount) not being incremented for it.
In the general case, the _used_bytes_ metadata is updated correctly i.e. whenever a chunk is written and putBlock is called. But when a chunk is overwritten, then it is assumed that the size of the chunk remains the same. But it’s possible to overwrite more data into the chunk than originally present. In this case, the _used_bytes_ should be updated with difference in the chunkSizes.
When blocks are deleted from a container, the _key_count_ and _used_bytes_ is decremented accordingly. But if these values were incorrect (less than the actual), then deleting blocks could lead to negative values for these metadata.
> Incorrect BLOCKCOUNT and BYTESUSED in container DB
> --------------------------------------------------
>
> Key: HDDS-5359
> URL: https://issues.apache.org/jira/browse/HDDS-5359
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Sammi Chen
> Assignee: Hanisha Koneru
> Priority: Major
> Attachments: negative.txt
>
>
> Here are default column family data of two different container replicas，
> "#BCSID" -> 1354765
> "#BLOCKCOUNT" -> -21
> "#BYTESUSED" -> 0
> "#PENDINGDELETEBLOCKCOUNT" -> 78
> "#delTX" -> 1141106
> "#BCSID" -> 1895040
> "#BLOCKCOUNT" -> -5
> "#BYTESUSED" -> 0
> "#PENDINGDELETEBLOCKCOUNT" -> 106
> "#delTX" -> 1146817
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