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Posted to issues@ozone.apache.org by "Bharat Viswanadham (Jira)" <ji...@apache.org> on 2019/12/19 20:32:00 UTC
[jira] [Resolved] (HDDS-2755) Compare transactionID and updateID of
Volume operations to avoid replaying transactions
[ https://issues.apache.org/jira/browse/HDDS-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bharat Viswanadham resolved HDDS-2755.
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Fix Version/s: 0.5.0
Resolution: Fixed
> Compare transactionID and updateID of Volume operations to avoid replaying transactions
> ---------------------------------------------------------------------------------------
>
> Key: HDDS-2755
> URL: https://issues.apache.org/jira/browse/HDDS-2755
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Components: om
> Reporter: Hanisha Koneru
> Assignee: Hanisha Koneru
> Priority: Major
> Fix For: 0.5.0
>
>
> To ensure that volume operations are idempotent, we should first compare the transactionID with the objectID and updateID to make sure that the transaction is not a replay. If the transactionID <= updateID, then it implies that the transaction is a replay and hence it should be skipped.
> After this patch, the replay behavior for volume operations will be as follows:
> Lets say we have the following transactions:
> Tx 10 - CreateVolume (Vol1, objectID = 10, updateID = 10, owner = o1, quota = 100)
> Tx 12 - SetOwner (Vol1, objectID = 10, updateID = 12, owner = o2, quota = 100)
> Tx 20 - SetQuota (Vol1, objectID = 10, updateID = 20, owner = o2, quota = 200)
> Tx 28 - DeleteVolume (Vol1)
> Tx 40 - CreateVolume (Vol1, objectID = 40, updateID = 40, owner = o1, quota = 100)
> Tx 50 - SetOwner (Vol1, objectID = 40, updateID = 50, owner = o3, quota = 100)
> On replaying these transactions:
> Replay Tx 10 - Vol1 already exists => Tx will throw VOLUME_ALREADY_EXISTS when trying to createVolume
> Replay Tx 12 - UpdateID (50) is more than equal to TxID (12) => Tx will not update DB (return ReplayResponse in validateAndUpdateCache)
> Replay Tx 20 - UpdateID (50) is more than equal to TxID (20) => Tx will not update DB (return ReplayResponse in validateAndUpdateCache)
> Replay Tx 28 - UpdateID (50) is more than equal to TxID (28) => Tx will not update DB (return ReplayResponse in validateAndUpdateCache)
> Replay Tx 40 - Vol1 already exists => Tx will throw VOLUME_ALREADY_EXISTS when trying to createVolume
> Replay Tx 50 - UpdateID (50) is more than equal to TxID (28) => Tx will not update DB (return ReplayResponse in validateAndUpdateCache)
> So none of the transactions will effect any change in the DB.
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