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https://issues.apache.org/jira/browse/HDFS-3438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-3438:
------------------------------
Attachment: hdfs-3438.txt
Attached patch makes the following changes:
- bootstrapStandby no longer rolls the edit log on the other node. So, the
other node may be in STANDBY state and/or in safemode.
- it now uses a new RPC {{getMostRecentCheckpointTxId}} to determine which
image to transfer. I looked at using the {{txid=latest}} feature in
TransferFsImage, but unfortunately the APIs would have had to change around a
fair bit in order to use this and also know _which_ txid was fetched, etc.
- changed {{getTransactionId}} RPC to return either the most recent written ID
(if active) or the most recent applied ID (if in standby). This was necessary
so we can make sure that the new standby has access to the most up-to-date
edits.
> BootstrapStandby should not require a rollEdits on active node
> --------------------------------------------------------------
>
> Key: HDFS-3438
> URL: https://issues.apache.org/jira/browse/HDFS-3438
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ha
> Affects Versions: 2.0.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-3438.txt
>
>
> Currently, BootstrapStandby uses a rollEdits() call on the active NN in order
> to determine the most recent checkpoint and transaction ID. However, this
> means that you cannot bootstrap a standby when the active NN is in safe mode
> -- i.e you have to start the whole cluster before you can bootstrap a new
> standby. This makes the workflow to convert an existing cluster to HA more
> complicated. We should allow BootstrapStandby to work even when the NN is in
> safe mode.
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