internal int docShift; // total # deleted docs that were compacted by this merge
public MergeDocIDRemapper(SegmentInfos infos, int[][] docMaps, int[] delCounts, MergePolicy.OneMerge merge, int mergedDocCount)
{
this.docMaps = docMaps;
SegmentInfo firstSegment = merge.segments.Info(0);
int i = 0;
while (true)
{
SegmentInfo info = infos.Info(i);
if (info.Equals(firstSegment))
break;
minDocID += info.docCount;
i++;
}
int numDocs = 0;
for (int j = 0; j < docMaps.Length; i++, j++)
{
numDocs += infos.Info(i).docCount;
System.Diagnostics.Debug.Assert(infos.Info(i).Equals(merge.segments.Info(j)));
}
maxDocID = minDocID + numDocs;
starts = new int[docMaps.Length];
newStarts = new int[docMaps.Length];
starts[0] = minDocID;
newStarts[0] = minDocID;
for (i = 1; i < docMaps.Length; i++)
{
int lastDocCount = merge.segments.Info(i - 1).docCount;
starts[i] = starts[i - 1] + lastDocCount;
newStarts[i] = newStarts[i - 1] + lastDocCount - delCounts[i - 1];
}
docShift = numDocs - mergedDocCount;
// There are rare cases when docShift is 0. It happens
// if you try to delete a docID that's out of bounds,
// because the SegmentReader still allocates deletedDocs
// and pretends it has deletions ... so we can't make
// this assert here
// assert docShift > 0;
// Make sure it all adds up:
System.Diagnostics.Debug.Assert(docShift == maxDocID -(newStarts [docMaps.Length - 1] + merge.segments.Info(docMaps.Length - 1).docCount - delCounts [docMaps.Length - 1]));
}
public void Merge_ForNUnit(MergePolicy.OneMerge merge)
{
Merge(merge);
}
private void HandleMergeException(System.Exception t, MergePolicy.OneMerge merge)
{
if (infoStream != null)
{
Message("handleMergeException: merge=" + merge.SegString(directory) + " exc=" + t);
}
// Set the exception on the merge, so if
// optimize() is waiting on us it sees the root
// cause exception:
merge.SetException(t);
AddMergeException(merge);
if (t is MergePolicy.MergeAbortedException)
{
// We can ignore this exception (it happens when
// close(false) or rollback is called), unless the
// merge involves segments from external directories,
// in which case we must throw it so, for example, the
// rollbackTransaction code in addIndexes* is
// executed.
if (merge.isExternal)
throw t;
}
else if (t is System.IO.IOException || t is System.SystemException || t is System.ApplicationException)
{
throw t;
}
else
{
// Should not get here
System.Diagnostics.Debug.Fail("Exception is not expected type!");
throw new System.SystemException(null, t);
}
}
/// <summary>Does the actual merge, by calling <see cref="IndexWriter.Merge" /> </summary>
protected internal virtual void DoMerge(MergePolicy.OneMerge merge)
{
writer.Merge(merge);
}
/// <summary>Does the actual (time-consuming) work of the merge,
/// but without holding synchronized lock on IndexWriter
/// instance
/// </summary>
private int MergeMiddle(MergePolicy.OneMerge merge)
{
merge.CheckAborted(directory);
System.String mergedName = merge.info.name;
SegmentMerger merger = null;
int mergedDocCount = 0;
SegmentInfos sourceSegments = merge.segments;
int numSegments = sourceSegments.Count;
if (infoStream != null)
Message("merging " + merge.SegString(directory));
merger = new SegmentMerger(this, mergedName, merge);
merge.readers = new SegmentReader[numSegments];
merge.readersClone = new SegmentReader[numSegments];
bool mergeDocStores = false;
String currentDocStoreSegment;
lock(this) {
currentDocStoreSegment = docWriter.DocStoreSegment;
}
bool currentDSSMerged = false;
// This is try/finally to make sure merger's readers are
// closed:
bool success = false;
try
{
int totDocCount = 0;
for (int i = 0; i < numSegments; i++)
{
SegmentInfo info = sourceSegments.Info(i);
// Hold onto the "live" reader; we will use this to
// commit merged deletes
SegmentReader reader = merge.readers[i] = readerPool.Get(info, merge.mergeDocStores, MERGE_READ_BUFFER_SIZE, -1);
// We clone the segment readers because other
// deletes may come in while we're merging so we
// need readers that will not change
SegmentReader clone = merge.readersClone[i] = (SegmentReader)reader.Clone(true);
merger.Add(clone);
if (clone.HasDeletions)
{
mergeDocStores = true;
}
if (info.DocStoreOffset != -1 && currentDocStoreSegment != null)
{
currentDSSMerged |= currentDocStoreSegment.Equals(info.DocStoreSegment);
}
totDocCount += clone.NumDocs();
}
if (infoStream != null)
{
Message("merge: total " + totDocCount + " docs");
}
merge.CheckAborted(directory);
// If deletions have arrived and it has now become
// necessary to merge doc stores, go and open them:
if (mergeDocStores && !merge.mergeDocStores)
{
merge.mergeDocStores = true;
lock (this)
{
if (currentDSSMerged)
{
if (infoStream != null)
{
Message("now flush at mergeMiddle");
}
DoFlush(true, false);
}
}
for (int i = 0; i < numSegments; i++)
{
merge.readersClone[i].OpenDocStores();
}
// Clear DSS
merge.info.SetDocStore(-1, null, false);
}
// This is where all the work happens:
mergedDocCount = merge.info.docCount = merger.Merge(merge.mergeDocStores);
System.Diagnostics.Debug.Assert(mergedDocCount == totDocCount);
if (merge.useCompoundFile)
{
success = false;
string compoundFileName = IndexFileNames.SegmentFileName(mergedName, IndexFileNames.COMPOUND_FILE_EXTENSION);
try
{
if (infoStream != null)
{
Message("create compound file " + compoundFileName);
}
merger.CreateCompoundFile(compoundFileName);
success = true;
}
catch (System.IO.IOException ioe)
{
lock (this)
{
if (merge.IsAborted())
{
// This can happen if rollback or close(false)
// is called -- fall through to logic below to
// remove the partially created CFS:
}
else
{
HandleMergeException(ioe, merge);
}
}
}
catch (Exception t)
{
HandleMergeException(t, merge);
}
finally
{
if (!success)
{
if (infoStream != null)
{
Message("hit exception creating compound file during merge");
}
lock (this)
{
deleter.DeleteFile(compoundFileName);
deleter.DeleteNewFiles(merger.GetMergedFiles());
}
}
}
success = false;
lock (this)
{
// delete new non cfs files directly: they were never
// registered with IFD
deleter.DeleteNewFiles(merger.GetMergedFiles());
if (merge.IsAborted())
{
if (infoStream != null)
{
Message("abort merge after building CFS");
}
deleter.DeleteFile(compoundFileName);
return 0;
}
}
merge.info.SetUseCompoundFile(true);
}
int termsIndexDivisor;
bool loadDocStores;
// if the merged segment warmer was not installed when
// this merge was started, causing us to not force
// the docStores to close, we can't warm it now
bool canWarm = merge.info.DocStoreSegment == null || currentDocStoreSegment == null || !merge.info.DocStoreSegment.Equals(currentDocStoreSegment);
if (poolReaders && mergedSegmentWarmer != null && canWarm)
{
// Load terms index & doc stores so the segment
// warmer can run searches, load documents/term
// vectors
termsIndexDivisor = readerTermsIndexDivisor;
loadDocStores = true;
}
else
{
termsIndexDivisor = -1;
loadDocStores = false;
}
// TODO: in the non-realtime case, we may want to only
// keep deletes (it's costly to open entire reader
// when we just need deletes)
SegmentReader mergedReader = readerPool.Get(merge.info, loadDocStores, BufferedIndexInput.BUFFER_SIZE, termsIndexDivisor);
try
{
if (poolReaders && mergedSegmentWarmer != null)
{
mergedSegmentWarmer.Warm(mergedReader);
}
if (!CommitMerge(merge, merger, mergedDocCount, mergedReader))
{
// commitMerge will return false if this merge was aborted
return 0;
}
}
finally
{
lock (this)
{
readerPool.Release(mergedReader);
}
}
success = true;
}
finally
{
// Readers are already closed in commitMerge if we didn't hit
// an exc:
if (!success)
{
CloseMergeReaders(merge, true);
}
}
return mergedDocCount;
}
private void SetMergeDocStoreIsCompoundFile(MergePolicy.OneMerge merge)
{
lock (this)
{
string mergeDocStoreSegment = merge.info.DocStoreSegment;
if (mergeDocStoreSegment != null && !merge.info.DocStoreIsCompoundFile)
{
int size = segmentInfos.Count;
for (int i = 0; i < size; i++)
{
SegmentInfo info = segmentInfos.Info(i);
string docStoreSegment = info.DocStoreSegment;
if (docStoreSegment != null &&
docStoreSegment.Equals(mergeDocStoreSegment) &&
info.DocStoreIsCompoundFile)
{
merge.info.DocStoreIsCompoundFile = true;
break;
}
}
}
}
}
private void _MergeInit(MergePolicy.OneMerge merge)
{
lock (this)
{
System.Diagnostics.Debug.Assert(TestPoint("startMergeInit"));
System.Diagnostics.Debug.Assert(merge.registerDone);
System.Diagnostics.Debug.Assert(!merge.optimize || merge.maxNumSegmentsOptimize > 0);
if (hitOOM)
{
throw new System.SystemException("this writer hit an OutOfMemoryError; cannot merge");
}
if (merge.info != null)
// mergeInit already done
return ;
if (merge.IsAborted())
return ;
ApplyDeletes();
SegmentInfos sourceSegments = merge.segments;
int end = sourceSegments.Count;
// Check whether this merge will allow us to skip
// merging the doc stores (stored field & vectors).
// This is a very substantial optimization (saves tons
// of IO).
Directory lastDir = directory;
System.String lastDocStoreSegment = null;
int next = - 1;
bool mergeDocStores = false;
bool doFlushDocStore = false;
System.String currentDocStoreSegment = docWriter.DocStoreSegment;
// Test each segment to be merged: check if we need to
// flush/merge doc stores
for (int i = 0; i < end; i++)
{
SegmentInfo si = sourceSegments.Info(i);
// If it has deletions we must merge the doc stores
if (si.HasDeletions())
mergeDocStores = true;
// If it has its own (private) doc stores we must
// merge the doc stores
if (- 1 == si.DocStoreOffset)
mergeDocStores = true;
// If it has a different doc store segment than
// previous segments, we must merge the doc stores
System.String docStoreSegment = si.DocStoreSegment;
if (docStoreSegment == null)
mergeDocStores = true;
else if (lastDocStoreSegment == null)
lastDocStoreSegment = docStoreSegment;
else if (!lastDocStoreSegment.Equals(docStoreSegment))
mergeDocStores = true;
// Segments' docScoreOffsets must be in-order,
// contiguous. For the default merge policy now
// this will always be the case but for an arbitrary
// merge policy this may not be the case
if (- 1 == next)
next = si.DocStoreOffset + si.docCount;
else if (next != si.DocStoreOffset)
mergeDocStores = true;
else
next = si.DocStoreOffset + si.docCount;
// If the segment comes from a different directory
// we must merge
if (lastDir != si.dir)
mergeDocStores = true;
// If the segment is referencing the current "live"
// doc store outputs then we must merge
if (si.DocStoreOffset != - 1 && currentDocStoreSegment != null && si.DocStoreSegment.Equals(currentDocStoreSegment))
{
doFlushDocStore = true;
}
}
// if a mergedSegmentWarmer is installed, we must merge
// the doc stores because we will open a full
// SegmentReader on the merged segment:
if (!mergeDocStores && mergedSegmentWarmer != null && currentDocStoreSegment != null && lastDocStoreSegment != null && lastDocStoreSegment.Equals(currentDocStoreSegment))
{
mergeDocStores = true;
}
int docStoreOffset;
System.String docStoreSegment2;
bool docStoreIsCompoundFile;
if (mergeDocStores)
{
docStoreOffset = - 1;
docStoreSegment2 = null;
docStoreIsCompoundFile = false;
}
else
{
SegmentInfo si = sourceSegments.Info(0);
docStoreOffset = si.DocStoreOffset;
docStoreSegment2 = si.DocStoreSegment;
docStoreIsCompoundFile = si.DocStoreIsCompoundFile;
}
if (mergeDocStores && doFlushDocStore)
{
// SegmentMerger intends to merge the doc stores
// (stored fields, vectors), and at least one of the
// segments to be merged refers to the currently
// live doc stores.
// TODO: if we know we are about to merge away these
// newly flushed doc store files then we should not
// make compound file out of them...
if (infoStream != null)
Message("now flush at merge");
DoFlush(true, false);
}
merge.mergeDocStores = mergeDocStores;
// Bind a new segment name here so even with
// ConcurrentMergePolicy we keep deterministic segment
// names.
merge.info = new SegmentInfo(NewSegmentName(), 0, directory, false, true, docStoreOffset, docStoreSegment2, docStoreIsCompoundFile, false);
IDictionary<string, string> details = new Dictionary<string, string>();
details["optimize"] = merge.optimize + "";
details["mergeFactor"] = end + "";
details["mergeDocStores"] = mergeDocStores + "";
SetDiagnostics(merge.info, "merge", details);
// Also enroll the merged segment into mergingSegments;
// this prevents it from getting selected for a merge
// after our merge is done but while we are building the
// CFS:
mergingSegments.Add(merge.info);
}
}
/// <summary>Checks whether this merge involves any segments
/// already participating in a merge. If not, this merge
/// is "registered", meaning we record that its segments
/// are now participating in a merge, and true is
/// returned. Else (the merge conflicts) false is
/// returned.
/// </summary>
internal bool RegisterMerge(MergePolicy.OneMerge merge)
{
lock (this)
{
if (merge.registerDone)
return true;
if (stopMerges)
{
merge.Abort();
throw new MergePolicy.MergeAbortedException("merge is aborted: " + merge.SegString(directory));
}
int count = merge.segments.Count;
bool isExternal = false;
for (int i = 0; i < count; i++)
{
SegmentInfo info = merge.segments.Info(i);
if (mergingSegments.Contains(info))
{
return false;
}
if (segmentInfos.IndexOf(info) == -1)
{
return false;
}
if (info.dir != directory)
{
isExternal = true;
}
if (segmentsToOptimize.Contains(info))
{
merge.optimize = true;
merge.maxNumSegmentsOptimize = optimizeMaxNumSegments;
}
}
EnsureContiguousMerge(merge);
pendingMerges.AddLast(merge);
if (infoStream != null)
Message("add merge to pendingMerges: " + merge.SegString(directory) + " [total " + pendingMerges.Count + " pending]");
merge.mergeGen = mergeGen;
merge.isExternal = isExternal;
// OK it does not conflict; now record that this merge
// is running (while synchronized) to avoid race
// condition where two conflicting merges from different
// threads, start
for (int i = 0; i < count; i++)
{
SegmentInfo si = merge.segments.Info(i);
mergingSegments.Add(si);
}
// Merge is now registered
merge.registerDone = true;
return true;
}
}
// Remaps all buffered deletes based on a completed
// merge
internal virtual void Remap(MergeDocIDRemapper mapper, SegmentInfos infos, int[][] docMaps, int[] delCounts, MergePolicy.OneMerge merge, int mergeDocCount)
{
lock (this)
{
IDictionary<Term, Num> newDeleteTerms;
// Remap delete-by-term
if (terms.Count > 0)
{
if (doTermSort)
{
newDeleteTerms = new SortedDictionary<Term, Num>();
}
else
{
newDeleteTerms = new HashMap<Term, Num>();
}
foreach(var entry in terms)
{
Num num = entry.Value;
newDeleteTerms[entry.Key] = new Num(mapper.Remap(num.GetNum()));
}
}
else
newDeleteTerms = null;
// Remap delete-by-docID
List<int> newDeleteDocIDs;
if (docIDs.Count > 0)
{
newDeleteDocIDs = new List<int>(docIDs.Count);
foreach(int num in docIDs)
{
newDeleteDocIDs.Add(mapper.Remap(num));
}
}
else
newDeleteDocIDs = null;
// Remap delete-by-query
HashMap<Query, int> newDeleteQueries;
if (queries.Count > 0)
{
newDeleteQueries = new HashMap<Query, int>(queries.Count);
foreach(var entry in queries)
{
int num = entry.Value;
newDeleteQueries[entry.Key] = mapper.Remap(num);
}
}
else
newDeleteQueries = null;
if (newDeleteTerms != null)
terms = newDeleteTerms;
if (newDeleteDocIDs != null)
docIDs = newDeleteDocIDs;
if (newDeleteQueries != null)
queries = newDeleteQueries;
}
}
public CheckAbort(MergePolicy.OneMerge merge, Directory dir)
{
this.merge = merge;
this.dir = dir;
}
internal SegmentMerger(IndexWriter writer, System.String name, MergePolicy.OneMerge merge)
{
InitBlock();
directory = writer.Directory;
segment = name;
if (merge != null)
{
checkAbort = new CheckAbort(merge, directory);
}
else
{
checkAbort = new AnonymousClassCheckAbort1(this, null, null);
}
termIndexInterval = writer.TermIndexInterval;
}
public virtual void SetRunningMerge(MergePolicy.OneMerge merge)
{
lock (this)
{
runningMerge = merge;
}
}
public MergeThread(ConcurrentMergeScheduler enclosingInstance, IndexWriter writer, MergePolicy.OneMerge startMerge)
{
InitBlock(enclosingInstance);
this.writer = writer;
this.startMerge = startMerge;
}
/// <summary>Create and return a new MergeThread </summary>
protected internal virtual MergeThread GetMergeThread(IndexWriter writer, MergePolicy.OneMerge merge)
{
lock (this)
{
var thread = new MergeThread(this, writer, merge);
thread.SetThreadPriority(mergeThreadPriority);
thread.IsBackground = true;
thread.Name = "Lucene Merge Thread #" + mergeThreadCount++;
return thread;
}
}
/// <summary> Merges the indicated segments, replacing them in the stack with a
/// single segment.
/// </summary>
internal void Merge(MergePolicy.OneMerge merge)
{
bool success = false;
try
{
try
{
try
{
MergeInit(merge);
if (infoStream != null)
{
Message("now merge\n merge=" + merge.SegString(directory) + "\n merge=" + merge + "\n index=" + SegString());
}
MergeMiddle(merge);
MergeSuccess(merge);
success = true;
}
catch (System.Exception t)
{
HandleMergeException(t, merge);
}
}
finally
{
lock (this)
{
MergeFinish(merge);
if (!success)
{
if (infoStream != null)
Message("hit exception during merge");
if (merge.info != null && !segmentInfos.Contains(merge.info))
deleter.Refresh(merge.info.name);
}
// This merge (and, generally, any change to the
// segments) may now enable new merges, so we call
// merge policy & update pending merges.
if (success && !merge.IsAborted() && !closed && !closing)
UpdatePendingMerges(merge.maxNumSegmentsOptimize, merge.optimize);
}
}
}
catch (System.OutOfMemoryException oom)
{
HandleOOM(oom, "merge");
}
}
/// <summary>Hook that's called when the specified merge is complete. </summary>
internal virtual void MergeSuccess(MergePolicy.OneMerge merge)
{
}
/// <summary>Called whenever a merge has completed and the merged segments had deletions </summary>
internal void RemapDeletes(SegmentInfos infos, int[][] docMaps, int[] delCounts, MergePolicy.OneMerge merge, int mergeDocCount)
{
lock (this)
{
if (docMaps == null)
// The merged segments had no deletes so docIDs did not change and we have nothing to do
return ;
MergeDocIDRemapper mapper = new MergeDocIDRemapper(infos, docMaps, delCounts, merge, mergeDocCount);
deletesInRAM.Remap(mapper, infos, docMaps, delCounts, merge, mergeDocCount);
deletesFlushed.Remap(mapper, infos, docMaps, delCounts, merge, mergeDocCount);
flushedDocCount -= mapper.docShift;
}
}
/// <summary>Does initial setup for a merge, which is fast but holds
/// the synchronized lock on IndexWriter instance.
/// </summary>
internal void MergeInit(MergePolicy.OneMerge merge)
{
lock (this)
{
bool success = false;
try
{
_MergeInit(merge);
success = true;
}
finally
{
if (!success)
{
MergeFinish(merge);
}
}
}
}
/// <summary> Expert: set the merge policy used by this writer.</summary>
public virtual void SetMergePolicy(MergePolicy mp)
{
EnsureOpen();
if (mp == null)
throw new System.NullReferenceException("MergePolicy must be non-null");
if (mergePolicy != mp)
mergePolicy.Close();
mergePolicy = mp;
PushMaxBufferedDocs();
if (infoStream != null)
{
Message("setMergePolicy " + mp);
}
}
/// <summary>Does fininishing for a merge, which is fast but holds
/// the synchronized lock on IndexWriter instance.
/// </summary>
internal void MergeFinish(MergePolicy.OneMerge merge)
{
lock (this)
{
// Optimize, addIndexes or finishMerges may be waiting
// on merges to finish.
System.Threading.Monitor.PulseAll(this);
// It's possible we are called twice, eg if there was an
// exception inside mergeInit
if (merge.registerDone)
{
SegmentInfos sourceSegments = merge.segments;
int end = sourceSegments.Count;
for (int i = 0; i < end; i++)
mergingSegments.Remove(sourceSegments.Info(i));
if(merge.info != null)
mergingSegments.Remove(merge.info);
merge.registerDone = false;
}
runningMerges.Remove(merge);
}
}
private int EnsureContiguousMerge(MergePolicy.OneMerge merge)
{
int first = segmentInfos.IndexOf(merge.segments.Info(0));
if (first == - 1)
throw new MergePolicy.MergeException("could not find segment " + merge.segments.Info(0).name + " in current index " + SegString(), directory);
int numSegments = segmentInfos.Count;
int numSegmentsToMerge = merge.segments.Count;
for (int i = 0; i < numSegmentsToMerge; i++)
{
SegmentInfo info = merge.segments.Info(i);
if (first + i >= numSegments || !segmentInfos.Info(first + i).Equals(info))
{
if (segmentInfos.IndexOf(info) == - 1)
throw new MergePolicy.MergeException("MergePolicy selected a segment (" + info.name + ") that is not in the current index " + SegString(), directory);
else
throw new MergePolicy.MergeException("MergePolicy selected non-contiguous segments to merge (" + merge.SegString(directory) + " vs " + SegString() + "), which IndexWriter (currently) cannot handle", directory);
}
}
return first;
}
private void CloseMergeReaders(MergePolicy.OneMerge merge, bool suppressExceptions)
{
lock (this)
{
int numSegments = merge.segments.Count;
if (suppressExceptions)
{
// Suppress any new exceptions so we throw the
// original cause
for (int i = 0; i < numSegments; i++)
{
if (merge.readers[i] != null)
{
try
{
readerPool.Release(merge.readers[i], false);
}
catch (Exception)
{
}
merge.readers[i] = null;
}
if (merge.readersClone[i] != null)
{
try
{
merge.readersClone[i].Close();
}
catch (Exception)
{
}
// This was a private clone and we had the
// only reference
System.Diagnostics.Debug.Assert(merge.readersClone[i].RefCount == 0); //: "refCount should be 0 but is " + merge.readersClone[i].getRefCount();
merge.readersClone[i] = null;
}
}
}
else
{
for (int i = 0; i < numSegments; i++)
{
if (merge.readers[i] != null)
{
readerPool.Release(merge.readers[i], true);
merge.readers[i] = null;
}
if (merge.readersClone[i] != null)
{
merge.readersClone[i].Close();
// This was a private clone and we had the only reference
System.Diagnostics.Debug.Assert(merge.readersClone[i].RefCount == 0);
merge.readersClone[i] = null;
}
}
}
}
}
/// <summary>Carefully merges deletes for the segments we just
/// merged. This is tricky because, although merging will
/// clear all deletes (compacts the documents), new
/// deletes may have been flushed to the segments since
/// the merge was started. This method "carries over"
/// such new deletes onto the newly merged segment, and
/// saves the resulting deletes file (incrementing the
/// delete generation for merge.info). If no deletes were
/// flushed, no new deletes file is saved.
/// </summary>
private void CommitMergedDeletes(MergePolicy.OneMerge merge, SegmentReader mergeReader)
{
lock (this)
{
System.Diagnostics.Debug.Assert(TestPoint("startCommitMergeDeletes"));
SegmentInfos sourceSegments = merge.segments;
if (infoStream != null)
Message("commitMergeDeletes " + merge.SegString(directory));
// Carefully merge deletes that occurred after we
// started merging:
int docUpto = 0;
int delCount = 0;
for (int i = 0; i < sourceSegments.Count; i++)
{
SegmentInfo info = sourceSegments.Info(i);
int docCount = info.docCount;
SegmentReader previousReader = merge.readersClone[i];
SegmentReader currentReader = merge.readers[i];
if (previousReader.HasDeletions)
{
// There were deletes on this segment when the merge
// started. The merge has collapsed away those
// deletes, but, if new deletes were flushed since
// the merge started, we must now carefully keep any
// newly flushed deletes but mapping them to the new
// docIDs.
if (currentReader.NumDeletedDocs > previousReader.NumDeletedDocs)
{
// This means this segment has had new deletes
// committed since we started the merge, so we
// must merge them:
for (int j = 0; j < docCount; j++)
{
if (previousReader.IsDeleted(j))
{
System.Diagnostics.Debug.Assert(currentReader.IsDeleted(j));
}
else
{
if (currentReader.IsDeleted(j))
{
mergeReader.DoDelete(docUpto);
delCount++;
}
docUpto++;
}
}
}
else
{
docUpto += docCount - previousReader.NumDeletedDocs;
}
}
else if (currentReader.HasDeletions)
{
// This segment had no deletes before but now it
// does:
for (int j = 0; j < docCount; j++)
{
if (currentReader.IsDeleted(j))
{
mergeReader.DoDelete(docUpto);
delCount++;
}
docUpto++;
}
}
// No deletes before or after
else
docUpto += info.docCount;
}
System.Diagnostics.Debug.Assert(mergeReader.NumDeletedDocs == delCount);
mergeReader.hasChanges = delCount > 0;
}
}
internal virtual void AddMergeException(MergePolicy.OneMerge merge)
{
lock (this)
{
System.Diagnostics.Debug.Assert(merge.GetException() != null);
if (!mergeExceptions.Contains(merge) && mergeGen == merge.mergeGen)
mergeExceptions.Add(merge);
}
}
/* FIXME if we want to support non-contiguous segment merges */
private bool CommitMerge(MergePolicy.OneMerge merge, SegmentMerger merger, int mergedDocCount, SegmentReader mergedReader)
{
lock (this)
{
System.Diagnostics.Debug.Assert(TestPoint("startCommitMerge"));
if (hitOOM)
{
throw new System.SystemException("this writer hit an OutOfMemoryError; cannot complete merge");
}
if (infoStream != null)
Message("commitMerge: " + merge.SegString(directory) + " index=" + SegString());
System.Diagnostics.Debug.Assert(merge.registerDone);
// If merge was explicitly aborted, or, if rollback() or
// rollbackTransaction() had been called since our merge
// started (which results in an unqualified
// deleter.refresh() call that will remove any index
// file that current segments does not reference), we
// abort this merge
if (merge.IsAborted())
{
if (infoStream != null)
Message("commitMerge: skipping merge " + merge.SegString(directory) + ": it was aborted");
return false;
}
int start = EnsureContiguousMerge(merge);
CommitMergedDeletes(merge, mergedReader);
docWriter.RemapDeletes(segmentInfos, merger.GetDocMaps(), merger.GetDelCounts(), merge, mergedDocCount);
// If the doc store we are using has been closed and
// is in now compound format (but wasn't when we
// started), then we will switch to the compound
// format as well:
SetMergeDocStoreIsCompoundFile(merge);
merge.info.HasProx = merger.HasProx();
segmentInfos.RemoveRange(start, start + merge.segments.Count - start);
System.Diagnostics.Debug.Assert(!segmentInfos.Contains(merge.info));
segmentInfos.Insert(start, merge.info);
CloseMergeReaders(merge, false);
// Must note the change to segmentInfos so any commits
// in-flight don't lose it:
Checkpoint();
// If the merged segments had pending changes, clear
// them so that they don't bother writing them to
// disk, updating SegmentInfo, etc.:
readerPool.Clear(merge.segments);
if (merge.optimize)
{
// cascade the optimize:
segmentsToOptimize.Add(merge.info);
}
return true;
}
}