Balazs Jeszenszky created IMPALA-6028:
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Summary: Document max_row_size for upgrade awareness
Key: IMPALA-6028
URL: https://issues.apache.org/jira/browse/IMPALA-6028
Project: IMPALA
Issue Type: Bug
Components: Docs
Affects Versions: Impala 2.10.0
Reporter: Balazs Jeszenszky
2.10 introduced the max_row_size query option. This is to replace the read_size
startup option from earlier, both of them control the maximum width of a row
impala can process. The defaults for these are different, while read_size was
8MB, the new default is 512kb. There is a tradeoff between being able to read
large rows and memory usage. The 512kb is expected to work well for most use
cases, having 8MB would reserve unnecessarily large chunks of memory in the new
buffer pool even if the rows are smaller.
We should advise users that they may have to append query options to their
workflows or change the 512kb default when upgrading to 2.10.
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