accumulo-notifications mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Adam Fuchs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3646) Duplicate entries when iterator emits entries past seek() range
Date Mon, 30 Mar 2015 13:45:53 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386712#comment-14386712
] 

Adam Fuchs commented on ACCUMULO-3646:
--------------------------------------

I also favor option #2, since option #1 would have affect performance. More documentation
on Iterator edge cases would be great, and we should probably consider rebuilding the iterator
framework at some point to get rid of some of these edge cases. 

> 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}



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message