Tim Armstrong resolved IMPALA-5778.
       Resolution: Fixed
    Fix Version/s: Impala 2.10.0

IMPALA-5778: clarify --read_size option.

Remove BTS_BLOCK_OVERFLOW error code, which is no longer used and
referenced --read_size.

Improve the flag description. The output is now:

    -read_size ((Advanced) The preferred I/O request size in bytes to issue to
      HDFS or the local filesystem. Increasing the read size will increase
      memory requirements. Decreasing the read size may decrease I/O
      throughput.) type: int32 default: 8388608

Tested that Impala built and basic queries could run.

Change-Id: I3c20a9d55f89170b11f569c90b7f2949ddbe4211
Reviewed-on: http://gerrit.cloudera.org:8080/7623
Reviewed-by: Tim Armstrong <tarmstr...@cloudera.com>
Tested-by: Impala Public Jenkins

> Clarify logging around and usage of read_size startup option
> ------------------------------------------------------------
>                 Key: IMPALA-5778
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5778
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>            Reporter: Balazs Jeszenszky
>            Assignee: Tim Armstrong
>             Fix For: Impala 2.10.0
> The following error message:
> "Cannot process row that is bigger than the IO size (row_size=X MB, 
> null_indicators_size=0). To run this query, increase the IO size (--read_size 
> option)."
> https://github.com/cloudera/Impala/blob/cba02a9a8b8cb765f9f4d2884f0a45e9af1bf2c7/common/thrift/generate_error_codes.py#L209-L211
> , and the read_size option in general, needs to be reviewed to reflect 
> changes from IMPALA-3200.

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