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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-1783) Gracefully handle strings with wrong character encoding
Date Mon, 11 Jan 2016 22:38:39 GMT

    [ https://issues.apache.org/jira/browse/AVRO-1783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092834#comment-15092834

Sean Busbey commented on AVRO-1783:

good digging! also, I should update my jruby version. ;)

> Gracefully handle strings with wrong character encoding
> -------------------------------------------------------
>                 Key: AVRO-1783
>                 URL: https://issues.apache.org/jira/browse/AVRO-1783
>             Project: Avro
>          Issue Type: Bug
>          Components: ruby
>    Affects Versions: 1.7.7
>            Reporter: Martin Kleppmann
> In the [vote thread for Avro 1.8.0-rc2|http://mail-archives.apache.org/mod_mbox/avro-dev/201601.mbox/%3CCAGHyZ6K-oe35%2BOYROK6MSwrHxfPHvjmqhJAfRJL2dzexYw6YSw%40mail.gmail.com%3E],
[~busbey] noticed that [phunt's avro-rpc-quickstart|https://github.com/phunt/avro-rpc-quickstart]
> {code}
> busbey$ ruby sample_ipc_client.rb avro_user pat Hello_World
> Avro::IO::AvroTypeError: The datum
> "\x89\xA9\xD1\xFF@NUm\xEA\x9A\xFB\xDAx\xF5Zq"
> is not an example of schema
> {"type":"fixed","name":"MD5","namespace":"org.apache.avro.ipc","size":16}
>               write_data at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/io.rb:543
>             write_record at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/io.rb:610
>                     each at org/jruby/RubyArray.java:1613
>             write_record at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/io.rb:609
>               write_data at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/io.rb:561
>                    write at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/io.rb:538
>  write_handshake_request at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/ipc.rb:136
>                  request at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/ipc.rb:105
>                  request at
> /Users/busbey/.rvm/gems/jruby-1.7.3/gems/avro-1.8.0/lib/avro/ipc.rb:117
>                   (root) at sample_ipc_client.rb:49
> {code}
> I tried reproducing the error, and it is quite strange. avro-rpc-quickstart works fine
for me in Ruby (MRI) 2.2 and 2.1, and in JRuby 1.7.23. However, [~busbey] was using JRuby
1.7.3 (as visible from the path names above), and in this particular version of JRuby I was
able to reproduce the issue.
> It seems that in some circumstances (but not always, bizarrely), JRuby 1.7.3 returns
a UTF-8 encoded string from {{Digest::MD5.digest}}, rather than a binary-encoded string. {{Schema.validate}}
checks that the string is suitable for writing as datum for a {{fixed}} type by calling {{#size}}.
In this case, although the MD5 digest of the schema is a 16-byte string, if you interpret
it as a UTF-8 encoded string, it consists of only 13 characters (i.e. some sequences are interpreted
as multibyte characters).
> Rather than trying to divine why JRuby is being weird here, I think this is an opportunity
to fix Avro's handling of strings to make it robust against unexpected encodings.

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