Jason Lowe commented on YARN-6875:

As long as the extra index file is only going to be used for the append case 
rather than the create case I'm OK with proceeding with the separate file.  As 
you mentioned, we can switch to a scan method if necessary.  Please add a 
unique marker in the metainfo block, as that allows the reader to sanity-check 
that it has properly located the block at the end of the file and also allows 
for scanning if necessary.

> New aggregated log file format for YARN log aggregation.
> --------------------------------------------------------
>                 Key: YARN-6875
>                 URL: https://issues.apache.org/jira/browse/YARN-6875
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-6875-NewLogAggregationFormat-design-doc.pdf
> T-file is the underlying log format for the aggregated logs in YARN. We have 
> seen several performance issues, especially for very large log files.
> We will introduce a new log format which have better performance for large 
> log files.

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