rabbah commented on issue #2878: Streamingly read user-logs.
URL: 
https://github.com/apache/incubator-openwhisk/pull/2878#issuecomment-346855336
 
 
   The docker log driver will flush the bytes comprising the log line but does 
not necessarily flush a fully formed json object - we've observed this in 
production for example where eventually with retries the parsing will succeed, 
or times out. This could be exacerbated by logging large volumes to a single 
log line (since we don't control when docker does it buffer flush, _or_, how 
the action does its logging). For an end user, we should strive to pass on as 
many of the logs as possible, and I don't see the reason not to do that when we 
are forced to truncate a single line.

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