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LUCENE-1547: fix rare thread hazard in IndexWriter.commit() 

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@747251 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless 2009-02-24 01:30:35 +00:00
parent 90d98045d8
commit 6fc659a345
1 changed files with 50 additions and 67 deletions
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45
src/java/org/apache/lucene/index/IndexWriter.java
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@ -3610,20 +3610,6 @@ public class IndexWriter {
finishCommit();
}
private boolean committing;
synchronized private void waitForCommit() {
// Only allow a single thread to do the commit, at a time:
while(committing)
doWait();
committing = true;
}
synchronized private void doneCommit() {
committing = false;
notifyAll();
}
/**
* <p>Commits all pending updates (added & deleted
* documents) to the index, and syncs all referenced index
@ -3670,10 +3656,6 @@ public class IndexWriter {
ensureOpen();
// Only let one thread do the prepare/finish at a time
waitForCommit();
try {
if (infoStream != null)
message("commit: start");
@ -3685,9 +3667,6 @@ public class IndexWriter {
message("commit: already prepared");
finishCommit();
} finally {
doneCommit();
}
}
private synchronized final void finishCommit() throws CorruptIndexException, IOException {
@ -3745,8 +3724,6 @@ public class IndexWriter {
flushCount++;
// Make sure no threads are actively adding a document
flushDeletes |= docWriter.deletesFull();
// When autoCommit=true we must always flush deletes
@ -3755,6 +3732,7 @@ public class IndexWriter {
// from an updateDocument call
flushDeletes |= autoCommit;
// Make sure no threads are actively adding a document.
// Returns true if docWriter is currently aborting, in
// which case we skip flushing this segment
if (docWriter.pauseAllThreads()) {
@ -4891,14 +4869,15 @@ public class IndexWriter {
// since I first started syncing my version, I can
// safely skip saving myself since I've been
// superseded:
if (myChangeCount > lastCommitChangeCount && (pendingCommit == null || myChangeCount > pendingCommitChangeCount)) {
// Wait now for any current pending commit to complete:
while(pendingCommit != null) {
if (infoStream != null)
message("wait for existing pendingCommit to finish...");
doWait();
while(true) {
if (myChangeCount <= lastCommitChangeCount) {
if (infoStream != null) {
message("sync superseded by newer infos");
}
break;
} else if (pendingCommit == null) {
// My turn to commit
if (segmentInfos.getGeneration() > toSync.getGeneration())
toSync.updateGeneration(segmentInfos);
@ -4928,8 +4907,12 @@ public class IndexWriter {
if (!success && infoStream != null)
message("hit exception committing segments file");
}
} else if (infoStream != null)
message("sync superseded by newer infos");
break;
} else {
// Must wait for other commit to complete
doWait();
}
}
}
if (infoStream != null)