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https://issues.apache.org/jira/browse/HDFS-11588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Busbey updated HDFS-11588:
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Component/s: tools
> Output Avro format in the offline editlog viewer
> ------------------------------------------------
>
> Key: HDFS-11588
> URL: https://issues.apache.org/jira/browse/HDFS-11588
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: tools
> Reporter: Haohui Mai
> Assignee: Haohui Mai
>
> We found that it is handy to import the edit logs into query engines (e.g.,
> Hive / Presto) to understand the usages of the cluster. Some examples include:
> * The size of the data and the number of files that are written into a
> directory
> * The distribution of the operations, for different directories.
> * The number of files that are created by a user.
> The answers to the above questions give insights on the usages of the
> clusters and have significant values on capacity planning.
> Importing the edit log into query engines simplifies the tasks of answering
> these questions, and they can be answered efficiently.
> While the Offline Editlog Viewer (OEV) supports outputting editlogs in XML
> formats, we found that it is time-consuming to transforming the XML format to
> formats that query engines recognize, because the generating the editlogs in
> XML formats and transforming them into formats that the query engine
> understands takes significant amount of time. In our environment it takes
> minutes to prepare a 100MB editlog file into a corresponding Parquet file.
> This jira proposes to extend the OEV to output Avro files to make this
> process efficient. As an internal tool, the Avro output format has certain
> pre-defined schemas but it does not have the constraint of maintaining
> backward compatibility of the output, which is similar to the XML output
> format.
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