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https://issues.apache.org/jira/browse/HDFS-1801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-1801:
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Component/s: name-node
Description:
Currently, the NameNode validates checkpoint uploads by using timestamps
associated with checkpoints and edit logs. However, now that we have
transaction IDs that uniquely identify each point in time in the history of a
namespace, it is more robust to simply use transaction IDs to identify images
and edits.
This JIRA is to remove the use of editsTime and checkpointTime and replace it
with:
* {{lastCheckpointTxId}} - the highest transaction ID reflected in the most
recently saved fsimage file
* {{lastLogRollTxId}} - the highest transaction ID in {{edits}} when
{{rollFsImage}} was called by the checkpointing node.
Affects Version/s: Edit log branch (HDFS-1073)
Fix Version/s: Edit log branch (HDFS-1073)
> Remove use of timestamps to identify checkpoints and logs
> ---------------------------------------------------------
>
> Key: HDFS-1801
> URL: https://issues.apache.org/jira/browse/HDFS-1801
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: Edit log branch (HDFS-1073)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: Edit log branch (HDFS-1073)
>
>
> Currently, the NameNode validates checkpoint uploads by using timestamps
> associated with checkpoints and edit logs. However, now that we have
> transaction IDs that uniquely identify each point in time in the history of a
> namespace, it is more robust to simply use transaction IDs to identify images
> and edits.
> This JIRA is to remove the use of editsTime and checkpointTime and replace it
> with:
> * {{lastCheckpointTxId}} - the highest transaction ID reflected in the most
> recently saved fsimage file
> * {{lastLogRollTxId}} - the highest transaction ID in {{edits}} when
> {{rollFsImage}} was called by the checkpointing node.
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