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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1366) Create mechanism for user iterators to report problems
Date Wed, 01 May 2013 15:50:15 GMT
Josh Elser created ACCUMULO-1366:
------------------------------------

             Summary: 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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