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https://issues.apache.org/jira/browse/HUDI-6116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ethan Guo updated HUDI-6116:
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Status: In Progress (was: Open)
> Optimize log block reading by removing seeks to check corrupted blocks
> ----------------------------------------------------------------------
>
> Key: HUDI-6116
> URL: https://issues.apache.org/jira/browse/HUDI-6116
> Project: Apache Hudi
> Issue Type: Improvement
> Reporter: Prashant Wason
> Assignee: Prashant Wason
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.14.0, 1.0.0
>
>
> The code currently does an eager isCorruptedCheck for which we do a seek and
> then a read which invalidates our internal buffers in opened file stream to
> the log file and makes a call to DataNode to start a new blockReader.
> The seek + read becomes apparent when we do cross datacenter reads or where
> the latency to the file is HIGH. In cases, a single RPC will cost us about
> 120ms + Cost of RPC (west coast to east coast) so this seek is bad for
> performance.
> Delaying the corrupt check also gives us many benefits in low latency env
> where we see times reducing from (5 to 8 sec) to (3s to < 500ms) for a
> moderately sized files of 250MB.
> NOTE: The more number of log blocks to read, the greater the performance
> improvements.
>
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