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From "Adam Fuchs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3645) Iterators not run at compaction when tablets are empty
Date Mon, 09 Mar 2015 19:12:38 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14353416#comment-14353416
] 

Adam Fuchs commented on ACCUMULO-3645:
--------------------------------------

I actually do think this is a bug. If I launch a major compaction with an extra iterator in
place that randomly generates key/value pairs then the "optimization" that is in place to
skip the compaction breaks the semantics that I would expect. We don't have any restrictions
on iterators that they only return key/value pairs that were already in the tablet, so the
assumption that a compaction would have no effect when there are no entries in the tablet
is invalid in the presence of user-generated iterators.

More importantly, this optimization is not necessary for general system performance, and I
don't think that removing it in the case of custom iterators would measurably affect general
performance. It seems like there is a more general concern about supporting this behavior.
If this usage fits with the concept of iterators and would otherwise work, is there a reason
why we would want to prevent it?

> Iterators not run at compaction when tablets are empty
> ------------------------------------------------------
>
>                 Key: ACCUMULO-3645
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3645
>             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
>
> When an iterator is configured to run during a one-time manual major compaction on a
tablet that is empty, the iterator never runs. It seems as if Accumulo never constructs the
SKVI stack at all, because it tries to optimize by eliminating "unnecessary" tablet compactions.
Also true of MiniAccumulo.
> This is bad for "generator" iterators that emit keys (in sorted order) not present in
the tablet's data. They never have a chance to run.
> A workaround is for the client to insert "dummy data" into the tablets he wants to compact,
before starting a compaction with "generator" iterators.  Note that *any* data is sufficient,
even delete keys, to ensure the SKVI stack is built and run through.
> Test file: [InjectTest|https://github.com/Accla/d4m_api_java/blob/master/src/test/java/edu/mit/ll/graphulo/InjectTest.java]
> * method {{testInjectOnCompact_Empty}} fails because no data is in the tablets
> * method {{testInjectOnCompact}} passes because data is written into the tablets before
initiating compaction. 
> Two logs follow.  Both have a [DebugIterator|https://accumulo.apache.org/1.6/apidocs/org/apache/accumulo/core/iterators/DebugIterator.html]
set after an [InjectIterator|https://github.com/Accla/d4m_api_java/blob/master/src/main/java/edu/mit/ll/graphulo/InjectIterator.java],
an SKVI which "generates" hard-coded entries.  The root user scans the table after flush and
compact.
> Logs when no data in the tablets:
> {code}
> 2015-03-05 06:58:04,914 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:04,974 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.01 secs, nbTimes = [4 4 4.00 1] 
> 2015-03-05 06:58:04,992 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 15
entries in 0.01 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:05,018 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 2
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:05,052 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
4 entries in 0.00 secs, nbTimes = [2 2 2.00 1] 
> 2015-03-05 06:58:05,054 [tserver.TabletServer] DEBUG: Got compact message from user:
!SYSTEM
> 2015-03-05 06:58:05,135 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 15
entries in 0.01 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:05,138 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36422 2
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:05,384 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36422 2
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:05,386 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 15
entries in 0.01 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:05,504 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 2
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:05,509 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36422 15
entries in 0.01 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:06,069 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.01 secs, nbTimes = [3 3 3.00 1] 
> 2015-03-05 06:58:06,158 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36456;

> 2015-03-05 06:58:06,158 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36456;

> 2015-03-05 06:58:06,168 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36456 2
entries in 0.01 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:06,174 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36456;

> 2015-03-05 06:58:06,174 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36456;
action: scan; targetTable: test_InjectTest_testInjectOnCompact_Empty; authorizations: ; range:
{5m;f<=[(-inf,f%00; : [] 9223372036854775807 false)]}; columns: []; iterators: []; iteratorOptions:
{};
> 2015-03-05 06:58:06,174 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36478;

> 2015-03-05 06:58:06,174 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36456;

> 2015-03-05 06:58:06,174 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36478;
action: scan; targetTable: test_InjectTest_testInjectOnCompact_Empty; authorizations: ; range:
{5m<;f=[[f%00; : [] 9223372036854775807 false,+inf)]}; columns: []; iterators: []; iteratorOptions:
{};
> 2015-03-05 06:58:06,175 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36478;

> 2015-03-05 06:58:06,176 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36478 0
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:06,176 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36456 0
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> {code}
> Logs when data is in the tablets:
> {code}
> 2015-03-05 06:58:31,673 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:31,674 [tserver.NativeMap] DEBUG: Allocated native map 0x000000000300ac20
> 2015-03-05 06:58:31,674 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 17
entries in 0.01 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:31,676 [tserver.Tablet] DEBUG: MinC initiate lock 0.00 secs
> 2015-03-05 06:58:31,676 [tserver.NativeMap] DEBUG: Allocated native map 0x000000000300acc0
> 2015-03-05 06:58:31,676 [tserver.Tablet] DEBUG: MinC initiate lock 0.00 secs
> 2015-03-05 06:58:31,684 [tserver.MinorCompactor] DEBUG: Begin minor compaction hdfs://localhost:9000/accumulo/tables/5n/t-00001h5/F00001h6.rf_tmp
5n;f<
> 2015-03-05 06:58:31,691 [tserver.MinorCompactor] DEBUG: Begin minor compaction hdfs://localhost:9000/accumulo/tables/5n/default_tablet/F00001h7.rf_tmp
5n<;f
> 2015-03-05 06:58:31,725 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:31,726 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:31,766 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 2
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:31,779 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:31,780 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:31,833 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:31,834 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:31,886 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:31,887 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:31,939 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:31,940 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:31,992 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:31,993 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:32,046 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [0 0 0.00 1] 
> 2015-03-05 06:58:32,047 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:32,099 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:32,100 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:32,147 [tserver.Compactor] DEBUG: Compaction 5n;f< 1 read | 1 written
| 2,147,483,647 entries/sec |  0.000 secs
> 2015-03-05 06:58:32,148 [tserver.Compactor] DEBUG: Compaction 5n<;f 2 read | 2 written
| 2,147,483,647 entries/sec |  0.000 secs
> 2015-03-05 06:58:32,153 [tserver.Tablet] DEBUG: Logs for memory compacted: 5n;f< localhost:9997/hdfs://localhost:9000/accumulo/wal/localhost+9997/706df902-2745-4c08-86bf-dfd4e9b8c729
> 2015-03-05 06:58:32,153 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [2 2 2.00 1] 
> 2015-03-05 06:58:32,153 [tserver.Tablet] DEBUG: Logs to be destroyed: 5n;f< localhost:9997/hdfs://localhost:9000/accumulo/wal/localhost+9997/706df902-2745-4c08-86bf-dfd4e9b8c729
> 2015-03-05 06:58:32,155 [tserver.Tablet] DEBUG: Logs for memory compacted: 5n<;f localhost:9997/hdfs://localhost:9000/accumulo/wal/localhost+9997/706df902-2745-4c08-86bf-dfd4e9b8c729
> 2015-03-05 06:58:32,155 [tserver.Tablet] DEBUG: Logs to be destroyed: 5n<;f localhost:9997/hdfs://localhost:9000/accumulo/wal/localhost+9997/706df902-2745-4c08-86bf-dfd4e9b8c729
> 2015-03-05 06:58:32,155 [tserver.TabletServer] DEBUG: Got flush message from user: !SYSTEM
> 2015-03-05 06:58:32,172 [log.TabletServerLogger] DEBUG:  wrote MinC finish  400: writeTime:10ms

> 2015-03-05 06:58:32,173 [tserver.Tablet] TABLET_HIST: 5n;f< MinC [memory] -> hdfs://localhost:9000/accumulo/tables/5n/t-00001h5/F00001h6.rf
> 2015-03-05 06:58:32,173 [tserver.Tablet] DEBUG: MinC finish lock 0.00 secs 5n;f<
> 2015-03-05 06:58:32,173 [tserver.NativeMap] DEBUG: Deallocating native map 0x00000000037a1720
> 2015-03-05 06:58:32,178 [log.TabletServerLogger] DEBUG:  wrote MinC finish  401: writeTime:11ms

> 2015-03-05 06:58:32,178 [tserver.Tablet] TABLET_HIST: 5n<;f MinC [memory] -> hdfs://localhost:9000/accumulo/tables/5n/default_tablet/F00001h7.rf
> 2015-03-05 06:58:32,178 [tserver.Tablet] DEBUG: MinC finish lock 0.00 secs 5n<;f
> 2015-03-05 06:58:32,178 [tserver.NativeMap] DEBUG: Deallocating native map 0x000000000300aaa0
> 2015-03-05 06:58:32,208 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:32,253 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
4 entries in 0.00 secs, nbTimes = [1 1 1.00 1] 
> 2015-03-05 06:58:32,254 [tserver.TabletServer] DEBUG: Got compact message from user:
!SYSTEM
> 2015-03-05 06:58:32,256 [tserver.Tablet] DEBUG: Major compaction plan: null propogate
deletes : false
> 2015-03-05 06:58:32,256 [tserver.Tablet] DEBUG: MajC initiate lock 0.00 secs, wait 0.00
secs
> 2015-03-05 06:58:32,256 [tserver.Tablet] DEBUG: Major compaction plan: null propogate
deletes : false
> 2015-03-05 06:58:32,256 [tserver.Tablet] DEBUG: MajC initiate lock 0.00 secs, wait 0.00
secs
> 2015-03-05 06:58:32,257 [tserver.Tablet] DEBUG: Starting MajC 5n<;f (USER) [hdfs://localhost:9000/accumulo/tables/5n/default_tablet/F00001h7.rf]
--> hdfs://localhost:9000/accumulo/tables/5n/default_tablet/A00001h8.rf_tmp  [name:InjectIterator,
priority:15, class:edu.mit.ll.graphulo.InjectIterator, properties:{}, name:DebugIterator,
priority:16, class:org.apache.accumulo.core.iterators.DebugIterator, properties:{}]
> 2015-03-05 06:58:32,257 [tserver.Tablet] DEBUG: Starting MajC 5n;f< (USER) [hdfs://localhost:9000/accumulo/tables/5n/t-00001h5/F00001h6.rf]
--> hdfs://localhost:9000/accumulo/tables/5n/t-00001h5/A00001h9.rf_tmp  [name:InjectIterator,
priority:15, class:edu.mit.ll.graphulo.InjectIterator, properties:{}, name:DebugIterator,
priority:16, class:org.apache.accumulo.core.iterators.DebugIterator, properties:{}]
> 2015-03-05 06:58:32,270 [graphulo.BranchIterator] INFO : class edu.mit.ll.graphulo.InjectIterator:
init on scope majc fullScan=true
> 2015-03-05 06:58:32,270 [iterators.DebugIterator] DEBUG: init(edu.mit.ll.graphulo.InjectIterator@20a11899,
{}, org.apache.accumulo.tserver.TabletIteratorEnvironment@3055f58b)
> 2015-03-05 06:58:32,271 [iterators.DebugIterator] DEBUG: 0x5B6B9177 seek([f%00; : []
9223372036854775807 false,+inf), [], false)
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
kTablet2 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
kTablet2 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
kTablet2 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopValue() -->
7
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 next()
> 2015-03-05 06:58:32,272 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
m1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
m1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
m1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopValue() -->
1
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 next()
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
zTablet2 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
zTablet2 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> true
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopKey() -->
zTablet2 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 getTopValue() -->
7
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 next()
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> false
> 2015-03-05 06:58:32,273 [iterators.DebugIterator] DEBUG: 0x5B6B9177 hasTop() --> false
> 2015-03-05 06:58:32,275 [graphulo.BranchIterator] INFO : class edu.mit.ll.graphulo.InjectIterator:
init on scope majc fullScan=true
> 2015-03-05 06:58:32,275 [iterators.DebugIterator] DEBUG: init(edu.mit.ll.graphulo.InjectIterator@6b76817,
{}, org.apache.accumulo.tserver.TabletIteratorEnvironment@7312c172)
> 2015-03-05 06:58:32,275 [iterators.DebugIterator] DEBUG: 0x545A5E63 seek((-inf,f%00;
: [] 9223372036854775807 false), [], false)
> 2015-03-05 06:58:32,276 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,276 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
a1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,276 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
a1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopValue() -->
1
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 next()
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
aTablet1 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
aTablet1 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
aTablet1 :cq [] 1425556711614 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopValue() -->
7
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 next()
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
c1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
c1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
c1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopValue() -->
1
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 next()
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
m1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
m1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> true
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopKey() -->
m1 colF3:colQ3 [] 1425553534769 false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 getTopValue() -->
1
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 next()
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> false
> 2015-03-05 06:58:32,277 [iterators.DebugIterator] DEBUG: 0x545A5E63 hasTop() --> false
> 2015-03-05 06:58:32,307 [tserver.Compactor] DEBUG: Compaction 5n<;f 2 read | 3 written
|    181 entries/sec |  0.011 secs
> 2015-03-05 06:58:32,320 [tserver.TabletServer] INFO : Adding 1 logs for extent !0<;~
as alias 3
> 2015-03-05 06:58:32,340 [tserver.Tablet] DEBUG: MajC finish lock 0.00 secs
> 2015-03-05 06:58:32,340 [tserver.Tablet] TABLET_HIST: 5n<;f MajC [hdfs://localhost:9000/accumulo/tables/5n/default_tablet/F00001h7.rf]
--> hdfs://localhost:9000/accumulo/tables/5n/default_tablet/A00001h8.rf
> 2015-03-05 06:58:32,612 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36422 2
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:32,612 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 17
entries in 0.01 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:32,718 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36525;

> 2015-03-05 06:58:32,722 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36525;

> 2015-03-05 06:58:32,725 [tserver.Compactor] DEBUG: Compaction 5n;f< 1 read | 4 written
|     71 entries/sec |  0.014 secs
> 2015-03-05 06:58:32,736 [tserver.TabletServer] DEBUG: UpSess 127.0.0.1:36525 59 in 0.018s,
at=[0 0 0.00 1] ft=0.013s(pt=0.000s lt=0.013s ct=0.000s)
> 2015-03-05 06:58:32,749 [tserver.Tablet] DEBUG: MajC finish lock 0.00 secs
> 2015-03-05 06:58:32,749 [tserver.Tablet] TABLET_HIST: 5n;f< MajC [hdfs://localhost:9000/accumulo/tables/5n/t-00001h5/F00001h6.rf]
--> hdfs://localhost:9000/accumulo/tables/5n/t-00001h5/A00001h9.rf
> 2015-03-05 06:58:33,269 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:60455 !0
6 entries in 0.00 secs, nbTimes = [4 4 4.00 1] 
> 2015-03-05 06:58:33,361 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36506;

> 2015-03-05 06:58:33,361 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36526;

> 2015-03-05 06:58:33,362 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36506;
action: scan; targetTable: test_InjectTest_testInjectOnCompact; authorizations: ; range: {5n;f<=[(-inf,f%00;
: [] 9223372036854775807 false)]}; columns: []; iterators: []; iteratorOptions: {};
> 2015-03-05 06:58:33,362 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36526;
action: scan; targetTable: test_InjectTest_testInjectOnCompact; authorizations: ; range: {5n<;f=[[f%00;
: [] 9223372036854775807 false,+inf)]}; columns: []; iterators: []; iteratorOptions: {};
> 2015-03-05 06:58:33,362 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36506;

> 2015-03-05 06:58:33,362 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36526;

> 2015-03-05 06:58:33,378 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36526 3
entries in 0.02 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:33,378 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36506 3
entries in 0.02 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:33,459 [tserver.TabletServer] DEBUG: ScanSess tid 127.0.0.1:36530 !0
0 entries in 0.00 secs, nbTimes = [0 0 0.00 1] 
> 2015-03-05 06:58:33,493 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36525;

> 2015-03-05 06:58:33,495 [Audit   ] INFO : operation: permitted; user: root; client: 127.0.0.1:36525;

> 2015-03-05 06:58:33,505 [tserver.TabletServer] DEBUG: UpSess 127.0.0.1:36525 4 in 0.011s,
at=[1 1 1.00 1] ft=0.008s(pt=0.000s lt=0.008s ct=0.000s)
> 2015-03-05 06:58:33,580 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:60455 2
entries in 0.00 secs (lookup_time:0.00 secs tablets:1 ranges:1) 
> 2015-03-05 06:58:33,586 [tserver.TabletServer] DEBUG: MultiScanSess 127.0.0.1:36422 17
entries in 0.01 secs (lookup_time:0.01 secs tablets:1 ranges:1) 
> {code}



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