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LUCENE-4561: count in-flight threads for asserting memory 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1410326 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Simon Willnauer 2012-11-16 13:05:41 +00:00
parent 54b8e81b1f
commit fbad326573
1 changed files with 23 additions and 5 deletions
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28
lucene/core/src/java/org/apache/lucene/index/DocumentsWriterFlushControl.java
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@ -46,6 +46,7 @@ final class DocumentsWriterFlushControl {
private long activeBytes = 0;
private long flushBytes = 0;
private volatile int numPending = 0;
private int numDocsSinceStalled = 0; // only with assert
final AtomicBoolean flushDeletes = new AtomicBoolean(false);
private boolean fullFlush = false;
private final Queue<DocumentsWriterPerThread> flushQueue = new LinkedList<DocumentsWriterPerThread>();
@ -104,8 +105,8 @@ final class DocumentsWriterFlushControl {
// 2 * ramBufferBytes -> before we stall we need to cross the 2xRAM Buffer border this is still a valid limit
// (numPending + numFlushingDWPT() + numBlockedFlushes()) * peakDelta) -> those are the total number of DWPT that are not active but not yet fully fluhsed
// all of them could theoretically be taken out of the loop once they crossed the RAM buffer and the last document was the peak delta
// (perThreadPool.getActiveThreadState() * peakDelta) -> at any given time there could be n threads in flight that crossed the stall control before we reached the limit and each of them could hold a peak document
final long expected = (2 * (ramBufferBytes)) + ((numPending + numFlushingDWPT() + numBlockedFlushes()) * peakDelta) + (perThreadPool.getActiveThreadState() * peakDelta);
// (numDocsSinceStalled * peakDelta) -> at any given time there could be n threads in flight that crossed the stall control before we reached the limit and each of them could hold a peak document
final long expected = (2 * (ramBufferBytes)) + ((numPending + numFlushingDWPT() + numBlockedFlushes()) * peakDelta) + (numDocsSinceStalled * peakDelta);
// the expected ram consumption is an upper bound at this point and not really the expected consumption
if (peakDelta < (ramBufferBytes >> 1)) {
/*
@ -183,10 +184,26 @@ final class DocumentsWriterFlushControl {
}
return flushingDWPT;
} finally {
updateStallState();
assert assertMemory();
boolean stalled = updateStallState();
assert assertNumDocsSinceStalled(stalled) && assertMemory();
}
}
private boolean assertNumDocsSinceStalled(boolean stalled) {
/*
* updates the number of documents "finished" while we are in a stalled state.
* this is important for asserting memory upper bounds since it corresponds
* to the number of threads that are in-flight and crossed the stall control
* check before we actually stalled.
* see #assertMemory()
*/
if (stalled) {
numDocsSinceStalled++;
} else {
numDocsSinceStalled = 0;
}
return true;
}
synchronized void doAfterFlush(DocumentsWriterPerThread dwpt) {
assert flushingWriters.containsKey(dwpt);
@ -204,7 +221,7 @@ final class DocumentsWriterFlushControl {
}
}
private final void updateStallState() {
private final boolean updateStallState() {
assert Thread.holdsLock(this);
final long limit = stallLimitBytes();
@ -219,6 +236,7 @@ final class DocumentsWriterFlushControl {
(activeBytes < limit) &&
!closed;
stallControl.updateStalled(stall);
return stall;
}
public synchronized void waitForFlush() {