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https://issues.apache.org/jira/browse/ACCUMULO-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13646827#comment-13646827
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David Medinets commented on ACCUMULO-1366:
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Can the problem be exposed by JMX? If so, the source (the iterator) is
isolated from the reporting (i.e. aggregating)
> Create mechanism for user iterators to report problems
> ------------------------------------------------------
>
> Key: ACCUMULO-1366
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1366
> Project: Accumulo
> Issue Type: Improvement
> Components: tserver
> Reporter: Josh Elser
> Assignee: Keith Turner
> Fix For: 1.6.0
>
>
> A common workflow for Accumulo iterators is a custom SortedKeyValueIterator
> which knows certain logic on how to process a given table structure, e.g.
> when to skip to a new column, what to aggregate, how to parse a Value, etc.
> One deficiency is that the only way for such a SKVI to report unexpected data
> found in that table (sans killing the entire scan) is via a log message which
> will bubble up to the monitor. This isn't the best as log messages on the
> monitor are not persistent, nor are they guaranteed to actually alert anyone
> of problematic data found.
> It would be nice to have a mechanism for a SKVI to report a problem in a
> non-transient manner. Having some general interface would be desirable as we
> could use multiple implementations: the monitor, HTTP, mail, IRC/xmpp, etc.
> One easy implementation that may be low-hanging is re-using the "Table
> Problems" alerts that Accumulo will log, typically when HDFS read/write
> operations fail. Persistence is definitely a must. It would also be desirable
> to have something that can identify duplicate messages and aggregate them
> together so as to not overwhelm the consumer.
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