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https://issues.apache.org/jira/browse/ACCUMULO-1661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13809697#comment-13809697
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John Vines commented on ACCUMULO-1661:
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The issue is in Configuration.getStringCollection. That utilizes a tokenizer to
split on commas. Unfortunately, when there's an empty COLF, that gets base 64ed
to an empty string, which causes the tokenizer to interpret it not as a value
but as cruft. Configuration.getStrings has the same behavior, so the only way
around it is to not rely on the Configuration helpers, do the String
transformations ourselves. Or, we can go a slightly hacky route and just
manually check if that property is an empty String (vs. null) to know it's
there. However, cases where the empty string is among other options would still
probably get lost.
> AccumuloInputFormat cannot fetch empty column family
> ----------------------------------------------------
>
> Key: ACCUMULO-1661
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1661
> Project: Accumulo
> Issue Type: Bug
> Components: client
> Affects Versions: 1.4.3, 1.5.0
> Reporter: Billie Rinaldi
> Assignee: John Vines
> Fix For: 1.5.1, 1.6.0
>
>
> The following fails:
> {code:java}
> Job job = new Job();
> HashSet<Pair<Text,Text>> cols = new HashSet<Pair<Text,Text>>();
> cols.add(new Pair<Text,Text>(new Text(""), null));
> AccumuloInputFormat.fetchColumns(job, cols);
> Set<Pair<Text,Text>> setCols = AccumuloInputFormat.getFetchedColumns(job);
> assertEquals(cols.size(), setCols.size());
> {code}
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