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From "Dylan Hutchison (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3646) Duplicate entries when iterator emits entries past seek() range
Date Thu, 05 Mar 2015 15:07:38 GMT
Dylan Hutchison created ACCUMULO-3646:
-----------------------------------------

             Summary: Duplicate entries when iterator emits entries past seek() range
                 Key: ACCUMULO-3646
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3646
             Project: Accumulo
          Issue Type: Bug
          Components: client, mini, tserver
    Affects Versions: 1.6.1
         Environment: Ubuntu 14.04, Accumulo 1.6.1, Hadoop 2.6.0, Zookeeper 3.4.6
            Reporter: Dylan Hutchison
            Priority: Minor



The SortedKeyValueIterator's seek() method documents that an iterator may return keys past
the range passed to seek().  However, an iterator set at scan-time that returns values past
the range passed to seek() will return those keys multiple times if the client uses a BatchScanner.
 This does not occur when the client uses a Scanner. This has nothing to do with the VersioningIterator.
This has nothing to do with the entries actually in the table. Also affects MiniAccumulo.

If this is intended, we should update the SortedKeyValueIterator seek() documentation with
a warning that returning keys past the seek() range may result in a client seeing duplicate
keys. If this is not intended, then it is a bug.

Test code: See [InjectTest|https://github.com/Accla/d4m_api_java/blob/master/src/test/java/edu/mit/ll/graphulo/InjectTest.java]
* method {{testInjectOnScan_Empty}} fails because it uses a BatchScanner
* method {{testInjectOnScan_Empty_Reg}} passes because it uses a Scanner

In these methods, the [InjectIterator|https://github.com/Accla/d4m_api_java/blob/master/src/main/java/edu/mit/ll/graphulo/InjectIterator.java]
emits entries that go beyond the seek() range.  We confirm what is going on by placing a [DebugIterator|https://accumulo.apache.org/1.6/apidocs/org/apache/accumulo/core/iterators/DebugIterator.html]
right after.

Logs when using the BatchScanner:
notice that the "m1" row is returned twice:

{noformat}
015-03-05 06:05:34,768 [graphulo.BranchIterator] INFO : class edu.mit.ll.graphulo.InjectIterator:
init on scope scan
2015-03-05 06:05:34,768 [graphulo.BranchIterator] INFO : class edu.mit.ll.graphulo.InjectIterator:
init on scope scan
2015-03-05 06:05:34,770 [iterators.DebugIterator] DEBUG: init(edu.mit.ll.graphulo.InjectIterator@e9fe846,
{}, org.apache.accumulo.tserver.TabletIteratorEnvironment@b99fd03)
2015-03-05 06:05:34,771 [iterators.DebugIterator] DEBUG: 0x516E9F1F seek((-inf,f%00; : []
9223372036854775807 false), [], false)
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> a1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> a1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopValue() --> 1
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F next()
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> c1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> c1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> c1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopValue() --> 1
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F next()
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> m1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> m1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> true
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopKey() --> m1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F getTopValue() --> 1
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F next()
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> false
2015-03-05 06:05:34,772 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> false
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x516E9F1F hasTop() --> false
2015-03-05 06:05:34,770 [iterators.DebugIterator] DEBUG: init(edu.mit.ll.graphulo.InjectIterator@2528a1f1,
{}, org.apache.accumulo.tserver.TabletIteratorEnvironment@244a532a)
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA seek([f%00; : [] 9223372036854775807
false,+inf), [], false)
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA hasTop() --> true
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA getTopKey() --> m1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA hasTop() --> true
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA getTopKey() --> m1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA hasTop() --> true
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA getTopKey() --> m1
colF3:colQ3 [] 1425553534769 false
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA getTopValue() --> 1
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA next()
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA hasTop() --> false
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA hasTop() --> false
2015-03-05 06:05:34,773 [iterators.DebugIterator] DEBUG: 0x5DBB88BA hasTop() --> false
{noformat}




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