Adrien Grand created LUCENE-7945:
------------------------------------

             Summary: TestMergeSchedulerExternal failure
                 Key: LUCENE-7945
                 URL: https://issues.apache.org/jira/browse/LUCENE-7945
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Adrien Grand
            Priority: Minor


I hit the following test failure:

{noformat}
   [junit4] Suite: org.apache.lucene.TestMergeSchedulerExternal
   [junit4]   1> TEST FAILED; IW infoStream output:
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.366Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 init: current segments file is "segments"; 
deletionPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy@147f4499
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.403Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 now checkpoint "" [0 segments ; isCommit = false]
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.403Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to checkpoint
   [junit4]   1> IW 0 [2017-08-29T20:07:58.403Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 init: create=true
   [junit4]   1> IW 0 [2017-08-29T20:07:58.403Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 
   [junit4]   1> dir=MockDirectoryWrapper(RAMDirectory@1ed52170 
lockFactory=org.apache.lucene.store.SingleInstanceLockFactory@76c21fb3)
   [junit4]   1> index=
   [junit4]   1> version=8.0.0
   [junit4]   1> analyzer=org.apache.lucene.analysis.MockAnalyzer
   [junit4]   1> ramBufferSizeMB=-1.0
   [junit4]   1> maxBufferedDocs=2
   [junit4]   1> mergedSegmentWarmer=null
   [junit4]   1> 
delPolicy=org.apache.lucene.index.KeepOnlyLastCommitDeletionPolicy
   [junit4]   1> commit=null
   [junit4]   1> openMode=CREATE_OR_APPEND
   [junit4]   1> 
similarity=org.apache.lucene.search.similarities.RandomSimilarity
   [junit4]   1> mergeScheduler=MyMergeScheduler: maxThreadCount=-1, 
maxMergeCount=-1, ioThrottle=true
   [junit4]   1> codec=CheapBastard
   [junit4]   1> infoStream=org.apache.lucene.util.PrintStreamInfoStream
   [junit4]   1> mergePolicy=[LogByteSizeMergePolicy: minMergeSize=1677721, 
mergeFactor=13, maxMergeSize=2147483648, 
maxMergeSizeForForcedMerge=9223372036854775807, calibrateSizeByDeletes=true, 
maxMergeDocs=2147483647, maxCFSSegmentSizeMB=8.796093022207999E12, 
noCFSRatio=0.810681051478346]
   [junit4]   1> 
indexerThreadPool=org.apache.lucene.index.DocumentsWriterPerThreadPool@39b33696
   [junit4]   1> readerPooling=false
   [junit4]   1> perThreadHardLimitMB=1945
   [junit4]   1> useCompoundFile=true
   [junit4]   1> commitOnClose=true
   [junit4]   1> indexSort=null
   [junit4]   1> writer=org.apache.lucene.index.IndexWriter@14082bc1
   [junit4]   1> 
   [junit4]   1> IW 0 [2017-08-29T20:07:58.403Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 MMapDirectory.UNMAP_SUPPORTED=true
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.409Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flush postings as segment _0 numDocs=2
   [junit4]   1> IW 0 [2017-08-29T20:07:58.409Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write norms
   [junit4]   1> IW 0 [2017-08-29T20:07:58.409Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write docValues
   [junit4]   1> IW 0 [2017-08-29T20:07:58.409Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write points
   [junit4]   1> IW 0 [2017-08-29T20:07:58.422Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 13 msec to finish stored fields
   [junit4]   1> IW 0 [2017-08-29T20:07:58.448Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 25 msec to write postings and finish vectors
   [junit4]   1> IW 0 [2017-08-29T20:07:58.456Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 8 msec to write fieldInfos
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.456Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 new segment has 0 deleted docs
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.456Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 new segment has no vectors; no norms; no docValues; no prox; no freqs
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.456Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushedFiles=[_0.tip, _0.fdx, _0.doc, _0.tim, _0.fdt, _0.fnm]
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.456Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushed codec=CheapBastard
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.464Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushed: segment=_0 ramUsed=0.071 MB newFlushedSize=0.001 MB docs/MB=3,603.354
   [junit4]   1> IW 0 [2017-08-29T20:07:58.465Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 create compound file
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.552Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flush time 143.37104 msec
   [junit4]   1> DW 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publishFlushedSegment seg-private updates=null
   [junit4]   1> IW 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publishFlushedSegment _0(8.0.0):c2
   [junit4]   1> BD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 finished packet delGen=1 now completedDelGen=1
   [junit4]   1> IW 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publish sets newSegment delGen=1 seg=_0(8.0.0):c2
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 now checkpoint "_0(8.0.0):c2" [1 segments ; isCommit = false]
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to checkpoint
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_0.tip"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_0.fdx"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_0.doc"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_0.tim"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_0.fdt"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_0.fnm"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.553Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 delete [_0.tip, _0.fdx, _0.doc, _0.tim, _0.fdt, _0.fnm]
   [junit4]   1> LMP 0 [2017-08-29T20:07:58.554Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 findMerges: 1 segments
   [junit4]   1> LMP 0 [2017-08-29T20:07:58.554Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 seg=_0(8.0.0):c2 level=3.0891984 size=0.001 MB
   [junit4]   1> LMP 0 [2017-08-29T20:07:58.554Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   level -1.0 to 3.0891984: 1 segments
   [junit4]   1> MS 0 [2017-08-29T20:07:58.554Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 initDynamicDefaults spins=true maxThreadCount=1 maxMergeCount=6
   [junit4]   1> MS 0 [2017-08-29T20:07:58.554Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 now merge
   [junit4]   1> MS 0 [2017-08-29T20:07:58.554Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   index: _0(8.0.0):c2
   [junit4]   1> MS 0 [2017-08-29T20:07:58.554Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   no more merges pending; now return
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.559Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flush postings as segment _1 numDocs=2
   [junit4]   1> IW 0 [2017-08-29T20:07:58.559Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write norms
   [junit4]   1> IW 0 [2017-08-29T20:07:58.559Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write docValues
   [junit4]   1> IW 0 [2017-08-29T20:07:58.559Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write points
   [junit4]   1> IW 0 [2017-08-29T20:07:58.563Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 3 msec to finish stored fields
   [junit4]   1> IW 0 [2017-08-29T20:07:58.576Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 12 msec to write postings and finish vectors
   [junit4]   1> IW 0 [2017-08-29T20:07:58.578Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 2 msec to write fieldInfos
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.578Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 new segment has 0 deleted docs
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.578Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 new segment has no vectors; no norms; no docValues; no prox; no freqs
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.578Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushedFiles=[_1.doc, _1.tim, _1.tip, _1.fdx, _1.fnm, _1.fdt]
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.578Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushed codec=CheapBastard
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.578Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushed: segment=_1 ramUsed=0.071 MB newFlushedSize=0.001 MB docs/MB=3,603.354
   [junit4]   1> IW 0 [2017-08-29T20:07:58.579Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 create compound file
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flush time 44.222471 msec
   [junit4]   1> DW 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publishFlushedSegment seg-private updates=null
   [junit4]   1> IW 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publishFlushedSegment _1(8.0.0):c2
   [junit4]   1> BD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 finished packet delGen=2 now completedDelGen=2
   [junit4]   1> IW 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publish sets newSegment delGen=2 seg=_1(8.0.0):c2
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 now checkpoint "_0(8.0.0):c2 _1(8.0.0):c2" [2 segments ; isCommit = false]
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to checkpoint
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_1.doc"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_1.tim"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_1.tip"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_1.fdx"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_1.fnm"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_1.fdt"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.603Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 delete [_1.doc, _1.tim, _1.tip, _1.fdx, _1.fnm, _1.fdt]
   [junit4]   1> LMP 0 [2017-08-29T20:07:58.604Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 findMerges: 2 segments
   [junit4]   1> LMP 0 [2017-08-29T20:07:58.604Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 seg=_0(8.0.0):c2 level=3.0891984 size=0.001 MB
   [junit4]   1> LMP 0 [2017-08-29T20:07:58.604Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 seg=_1(8.0.0):c2 level=3.0891984 size=0.001 MB
   [junit4]   1> LMP 0 [2017-08-29T20:07:58.604Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   level -1.0 to 3.0891984: 2 segments
   [junit4]   1> MS 0 [2017-08-29T20:07:58.604Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 now merge
   [junit4]   1> MS 0 [2017-08-29T20:07:58.604Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   index: _0(8.0.0):c2 _1(8.0.0):c2
   [junit4]   1> MS 0 [2017-08-29T20:07:58.604Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   no more merges pending; now return
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.608Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flush postings as segment _2 numDocs=2
   [junit4]   1> IW 0 [2017-08-29T20:07:58.608Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write norms
   [junit4]   1> IW 0 [2017-08-29T20:07:58.608Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write docValues
   [junit4]   1> IW 0 [2017-08-29T20:07:58.608Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to write points
   [junit4]   1> IW 0 [2017-08-29T20:07:58.614Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 5 msec to finish stored fields
   [junit4]   1> IW 0 [2017-08-29T20:07:58.635Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 20 msec to write postings and finish vectors
   [junit4]   1> IW 0 [2017-08-29T20:07:58.637Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 2 msec to write fieldInfos
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.637Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 new segment has 0 deleted docs
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.638Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 new segment has no vectors; no norms; no docValues; no prox; no freqs
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.638Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushedFiles=[_2.tip, _2.fdt, _2.fnm, _2.fdx, _2.doc, _2.tim]
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.638Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushed codec=CheapBastard
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.638Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flushed: segment=_2 ramUsed=0.071 MB newFlushedSize=0.001 MB docs/MB=3,603.354
   [junit4]   1> IW 0 [2017-08-29T20:07:58.638Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 create compound file
   [junit4]   1> DWPT 0 [2017-08-29T20:07:58.663Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 flush time 54.878877 msec
   [junit4]   1> DW 0 [2017-08-29T20:07:58.663Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publishFlushedSegment seg-private updates=null
   [junit4]   1> IW 0 [2017-08-29T20:07:58.663Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publishFlushedSegment _2(8.0.0):c2
   [junit4]   1> BD 0 [2017-08-29T20:07:58.663Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 finished packet delGen=3 now completedDelGen=3
   [junit4]   1> IW 0 [2017-08-29T20:07:58.663Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 publish sets newSegment delGen=3 seg=_2(8.0.0):c2
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.663Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 now checkpoint "_0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2" [3 segments ; isCommit 
= false]
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.664Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 0 msec to checkpoint
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.664Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 will delete new file "_2.tip"
   [junit4]   1> IFD 0 [2017-08-29T20:07:58.664Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
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 registerMerge info=_8(8.0.0):c2
   [junit4]   1> IW 0 [2017-08-29T20:07:59.027Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 registerMerge info=_9(8.0.0):c2
   [junit4]   1> MS 0 [2017-08-29T20:07:59.028Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 now merge
   [junit4]   1> MS 0 [2017-08-29T20:07:59.028Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   index: _0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2 _3(8.0.0):c2 _4(8.0.0):c2 
_5(8.0.0):c2 _6(8.0.0):c2 _7(8.0.0):c2 _8(8.0.0):c2 _9(8.0.0):c2
   [junit4]   1> MS 0 [2017-08-29T20:07:59.028Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   consider merge _0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2 _3(8.0.0):c2 
_4(8.0.0):c2 _5(8.0.0):c2 _6(8.0.0):c2 _7(8.0.0):c2 _8(8.0.0):c2 _9(8.0.0):c2
   [junit4]   1> MS 0 [2017-08-29T20:07:59.028Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
     launch new thread [MyMergeThread]
   [junit4]   1> MS 0 [2017-08-29T20:07:59.072Z; MyMergeThread]:   merge 
thread: start
   [junit4]   1> BD 0 [2017-08-29T20:07:59.086Z; MyMergeThread]: 
waitApplyForMerge: 0 packets, 10 merging segments
   [junit4]   1> BD 0 [2017-08-29T20:07:59.086Z; MyMergeThread]: waitApply: no 
deletes to apply
   [junit4]   1> IW 0 [2017-08-29T20:07:59.086Z; MyMergeThread]: now apply 
deletes for 10 merging segments
   [junit4]   1> IW 0 [2017-08-29T20:07:59.086Z; MyMergeThread]: merge seg=_a 
_0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2 _3(8.0.0):c2 _4(8.0.0):c2 _5(8.0.0):c2 
_6(8.0.0):c2 _7(8.0.0):c2 _8(8.0.0):c2 _9(8.0.0):c2
   [junit4]   1> IW 0 [2017-08-29T20:07:59.086Z; MyMergeThread]: now merge
   [junit4]   1>   merge=_0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2 _3(8.0.0):c2 
_4(8.0.0):c2 _5(8.0.0):c2 _6(8.0.0):c2 _7(8.0.0):c2 _8(8.0.0):c2 _9(8.0.0):c2
   [junit4]   1>   index=_0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2 _3(8.0.0):c2 
_4(8.0.0):c2 _5(8.0.0):c2 _6(8.0.0):c2 _7(8.0.0):c2 _8(8.0.0):c2 _9(8.0.0):c2
   [junit4]   1> IW 0 [2017-08-29T20:07:59.086Z; MyMergeThread]: merging 
_0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2 _3(8.0.0):c2 _4(8.0.0):c2 _5(8.0.0):c2 
_6(8.0.0):c2 _7(8.0.0):c2 _8(8.0.0):c2 _9(8.0.0):c2
   [junit4]   1> IW 0 [2017-08-29T20:07:59.087Z; MyMergeThread]: TEST: now 
throw exc:
   [junit4]   1> java.io.IOException: now failing during merge
   [junit4]   1>        at 
org.apache.lucene.TestMergeSchedulerExternal$FailOnlyOnMerge.eval(TestMergeSchedulerExternal.java:95)
   [junit4]   1>        at 
org.apache.lucene.store.MockDirectoryWrapper.maybeThrowDeterministicException(MockDirectoryWrapper.java:1022)
   [junit4]   1>        at 
org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:743)
   [junit4]   1>        at 
org.apache.lucene.store.Directory.openChecksumInput(Directory.java:119)
   [junit4]   1>        at 
org.apache.lucene.store.MockDirectoryWrapper.openChecksumInput(MockDirectoryWrapper.java:1072)
   [junit4]   1>        at 
org.apache.lucene.codecs.lucene50.Lucene50CompoundReader.readEntries(Lucene50CompoundReader.java:105)
   [junit4]   1>        at 
org.apache.lucene.codecs.lucene50.Lucene50CompoundReader.<init>(Lucene50CompoundReader.java:69)
   [junit4]   1>        at 
org.apache.lucene.codecs.lucene50.Lucene50CompoundFormat.getCompoundReader(Lucene50CompoundFormat.java:71)
   [junit4]   1>        at 
org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:99)
   [junit4]   1>        at 
org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:78)
   [junit4]   1>        at 
org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:208)
   [junit4]   1>        at 
org.apache.lucene.index.ReadersAndUpdates.getReaderForMerge(ReadersAndUpdates.java:836)
   [junit4]   1>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4360)
   [junit4]   1>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4030)
   [junit4]   1>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:624)
   [junit4]   1>        at 
org.apache.lucene.TestMergeSchedulerExternal$MyMergeScheduler.doMerge(TestMergeSchedulerExternal.java:85)
   [junit4]   1>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:661)
   [junit4]   1> 
   [junit4]   1> IW 0 [2017-08-29T20:07:59.087Z; MyMergeThread]: 
handleMergeException: merge=_0(8.0.0):c2 _1(8.0.0):c2 _2(8.0.0):c2 _3(8.0.0):c2 
_4(8.0.0):c2 _5(8.0.0):c2 _6(8.0.0):c2 _7(8.0.0):c2 _8(8.0.0):c2 _9(8.0.0):c2 
exc=java.io.IOException: now failing during merge
   [junit4]   1> IW 0 [2017-08-29T20:07:59.087Z; MyMergeThread]: hit exception 
during merge
   [junit4]   1> IW 0 [2017-08-29T20:07:59.087Z; MyMergeThread]: hit tragic 
IOException inside merge
   [junit4]   1> IW 0 [2017-08-29T20:07:59.087Z; MyMergeThread]: rollback
   [junit4]   1> IW 0 [2017-08-29T20:07:59.087Z; MyMergeThread]: all running 
merges have aborted
   [junit4]   1> IW 0 [2017-08-29T20:07:59.087Z; MyMergeThread]: rollback: done 
finish merges
   [junit4]   1> MS 0 [2017-08-29T20:07:59.088Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
 updateMergeThreads ioThrottle=true targetMBPerSec=20.0 MB/sec
   [junit4]   1> merge thread MyMergeThread estSize=0.0 MB (written=0.0 MB) 
runTime=0.0s (stopped=0.0s, paused=0.0s) rate=unlimited
   [junit4]   1>   leave running at Infinity MB/sec
   [junit4]   1> MS 0 [2017-08-29T20:07:59.088Z; 
TEST-TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler-seed#[B944333784A66276]]:
   no more merges pending; now return
   [junit4]   1> DW 0 [2017-08-29T20:07:59.088Z; MyMergeThread]: abort
   [junit4]   1> DW 0 [2017-08-29T20:07:59.088Z; MyMergeThread]: done abort 
success=true
   [junit4]   1> IW 0 [2017-08-29T20:07:59.088Z; MyMergeThread]: rollback: 
infos=
   [junit4]   1> IW 0 [2017-08-29T20:07:59.089Z; MyMergeThread]: TEST: now 
handleMergeException
   [junit4]   1> MS 0 [2017-08-29T20:07:59.089Z; MyMergeThread]: 
updateMergeThreads ioThrottle=true targetMBPerSec=20.0 MB/sec
   [junit4]   1> 
   [junit4]   2> NOTE: reproduce with: ant test  
-Dtestcase=TestMergeSchedulerExternal 
-Dtests.method=testSubclassConcurrentMergeScheduler 
-Dtests.seed=B944333784A66276 -Dtests.slow=true -Dtests.locale=et-EE 
-Dtests.timezone=Etc/GMT+9 -Dtests.asserts=true -Dtests.file.encoding=UTF-8
   [junit4] FAILURE 0.75s J1 | 
TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler <<<
   [junit4]    > Throwable #1: java.lang.AssertionError
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([B944333784A66276:3EC58E9A80861872]:0)
   [junit4]    >        at 
org.apache.lucene.TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler(TestMergeSchedulerExternal.java:147)
   [junit4]    >        at java.lang.Thread.run(Thread.java:748)
   [junit4]   2> NOTE: test params are: codec=CheapBastard, 
sim=RandomSimilarity(queryNorm=true): {}, locale=et-EE, timezone=Etc/GMT+9
   [junit4]   2> NOTE: Linux 2.6.32-696.6.3.el6.x86_64 amd64/Oracle Corporation 
1.8.0_141 (64-bit)/cpus=4,threads=1,free=239361936,total=253755392
   [junit4]   2> NOTE: All tests run in this JVM: 
[TestLucene50StoredFieldsFormat, TestCustomTermFreq, TestBooleanQuery, 
TestComplexExplanations, TestGraphTokenizers, TestOmitPositions, 
TestRecyclingIntBlockAllocator, TestLockFactory, TestMergeSchedulerExternal]
{noformat}

It does not reproduce and logs seem to indicate that {{handleMergeException}} 
was actually called so this might be a race condition, ie. we check the value 
of {{excCalled}} before it is set?



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