[
https://issues.apache.org/jira/browse/HDFS-3878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447191#comment-13447191
]
Yanbo Liang commented on HDFS-3878:
-----------------------------------
The workflow of fetchEditLogs is the same as fetchImage. However, there are
many EditLog files, and we just need to download the EditLog files which is
unapplied to the latest FsImage file. Otherwise we will waste too much storage
volume. So we need to get the startTxId and endTxId which can specified some
EditLog files whose TxIds are all located in this range [startTxId, endTxId].
How to get the startTxId and endTxId? Do we need a new api which asks NameNode
to get this information? Or just indicated by administrator?
> Add an administrative command to download finalized edit log segments from
> the NN
> ---------------------------------------------------------------------------------
>
> Key: HDFS-3878
> URL: https://issues.apache.org/jira/browse/HDFS-3878
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: hdfs client, name-node
> Affects Versions: 2.0.0-alpha
> Reporter: Aaron T. Myers
>
> Similarly to the `hdfs dfsadmin -fetchImage' command added in HDFS-2941, it
> would be nice to have an admin command capable of fetching edit log segments.
> This could be useful, for example, for use in a script designed to back up
> the NN on-disk metadata.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
