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https://issues.apache.org/jira/browse/HDFS-13024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mukul Kumar Singh updated HDFS-13024:
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Summary: Ozone: ContainerStateMachine should synchronize operations between
createContainer and writeChunk (was: Ozone: ContainerStateMachine should
synchronize operations between createContainer op and writeChunk)
> Ozone: ContainerStateMachine should synchronize operations between
> createContainer and writeChunk
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-13024
> URL: https://issues.apache.org/jira/browse/HDFS-13024
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Mukul Kumar Singh
> Assignee: Mukul Kumar Singh
> Priority: Major
> Fix For: HDFS-7240
>
> Attachments: HDFS-13024-HDFS-7240.001.patch,
> HDFS-13024-HDFS-7240.002.patch, HDFS-13024-HDFS-7240.003.patch,
> HDFS-13024-HDFS-7240.004.patch, HDFS-13024-HDFS-7240.005.patch,
> HDFS-13024-HDFS-7240.006.patch, HDFS-13024-HDFS-7240.007.patch,
> HDFS-13024-HDFS-7240.008.patch
>
>
> This issue happens after HDFS-12853. with HDFS-12853, writeChunk op has been
> divided into two stages 1) the log write phase (here the state machine data
> is written) 2) ApplyTransaction.
> With a 3 node ratis ring, ratis leader will append the log entry to its log
> and forward it to its followers. However there is no guarantee on when the
> followers will apply the log to the state machine in {{applyTransaction}}.
> This issue happens in the following order
> 1) Leader accepts create container
> 2) Leader add entries to its logs and forwards to followers
> 3) Followers append the entry to its log and Ack to the raft leader (Please
> note that the transaction still hasn't been applied)
> 4) Leader applies the transaction and now replies
> 5) write chunk call is sent to the Leader
> 6) Leader now forwards the call to the followers
> 7) Followers try to apply the log by calling {{Dispatcher#dispatch}} however
> the create container call in 3) still hasn't been applied
> 8) write chunk call on followers fail.
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