[GitHub] [arrow] alamb opened a new pull request #8769: ARROW-10710: [Rust] Revery tokio upgrade, go back to 0.2

[GitBox]

alamb opened a new pull request #8769:
URL: https://github.com/apache/arrow/pull/8769


   ## Changes 
   
   This PR backs out the version upgrade to tokio done in 
https://github.com/apache/arrow/pull/8697 (see comment 
https://github.com/apache/arrow/pull/8697#issuecomment-732936572 by @rdettai 
for more details).
   
   ## Rationale:
   
   It seems as if the new version of tokio (0.3) has some fairly substantial 
changes, and some of the higher level libraries built on top of tokio that are 
used in the flight implementation do not yet support version 0.3 of tokio. This 
results in parts of the code (flight server) using the older version of tokio 
and parts of the code (datafusion) using newer versions of tokio which causes 
... issues. 
   
   This issue can be seen in the flight example linked in 
https://issues.apache.org/jira/browse/ARROW-10710 and I saw it when I tried to 
upgrade to latest arrow in https://github.com/influxdata/influxdb_iox
   
   For example, https://crates.io/crates/tonic appears to require tokio < 0.3
   
   <img width="350" alt="Screen Shot 2020-11-25 at 7 10 21 AM" 
src="https://user-images.githubusercontent.com/490673/100227458-2eabbb00-2eef-11eb-82a8-eb11dad03bc2.png";>
   
   
   
   cc @Dandandan  and @nevi-me 
   
   


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