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Strongly reference indices in DfsPackFile 

DfsBlockCache.Ref might get cleared out if the JVM is running out of
memory. As a result, the index is not persisted for the request and
will be reloaded unnecessarily.

Change-Id: I3b57ad5e6673f77f2dc66177a649ac412a97fe20
Signed-off-by: Minh Thai <mthai@google.com>
stable-5.4
Minh Thai 6 years ago
parent
e4fdca7355
commit
01f084f5d9
1 changed files with 113 additions and 128 deletions
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  1. 129
      org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java

129
org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java
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@ -98,13 +98,13 @@ public final class DfsPackFile extends BlockBasedFile {
private final Object initLock = new Object();
/** Index mapping {@link ObjectId} to position within the pack stream. */
private volatile DfsBlockCache.Ref<PackIndex> index;
private volatile PackIndex index;
/** Reverse version of {@link #index} mapping position to {@link ObjectId}. */
private volatile DfsBlockCache.Ref<PackReverseIndex> reverseIndex;
private volatile PackReverseIndex reverseIndex;
/** Index of compressed bitmap mapping entire object graph. */
private volatile DfsBlockCache.Ref<PackBitmapIndex> bitmapIndex;
private volatile PackBitmapIndex bitmapIndex;
/**
* Objects we have tried to read, and discovered to be corrupt.
@ -150,15 +150,15 @@ public final class DfsPackFile extends BlockBasedFile {
* @return whether the pack index file is loaded and cached in memory.
*/
public boolean isIndexLoaded() {
DfsBlockCache.Ref<PackIndex> idxref = index;
return idxref != null && idxref.has();
return index != null;
}
void setPackIndex(PackIndex idx) {
long objCnt = idx.getObjectCount();
int recSize = Constants.OBJECT_ID_LENGTH + 8;
long sz = objCnt * recSize;
index = cache.putRef(desc.getStreamKey(INDEX), sz, idx);
cache.putRef(desc.getStreamKey(INDEX), sz, idx);
index = idx;
}
/**
@ -176,12 +176,8 @@ public final class DfsPackFile extends BlockBasedFile {
}
private PackIndex idx(DfsReader ctx) throws IOException {
DfsBlockCache.Ref<PackIndex> idxref = index;
if (idxref != null) {
PackIndex idx = idxref.get();
if (idx != null) {
return idx;
}
if (index != null) {
return index;
}
if (invalid) {
@ -192,23 +188,21 @@ public final class DfsPackFile extends BlockBasedFile {
.dispatch(new BeforeDfsPackIndexLoadedEvent(this));
synchronized (initLock) {
idxref = index;
if (idxref != null) {
PackIndex idx = idxref.get();
if (idx != null) {
return idx;
}
if (index != null) {
return index;
}
DfsStreamKey idxKey = desc.getStreamKey(INDEX);
try {
idxref = cache.getOrLoadRef(idxKey, () -> {
DfsStreamKey idxKey = desc.getStreamKey(INDEX);
DfsBlockCache.Ref<PackIndex> idxref = cache.getOrLoadRef(idxKey,
() -> {
try {
ctx.stats.readIdx++;
long start = System.nanoTime();
try (ReadableChannel rc = ctx.db.openFile(desc,
INDEX)) {
InputStream in = Channels.newInputStream(rc);
InputStream in = Channels
.newInputStream(rc);
int wantSize = 8192;
int bs = rc.blockSize();
if (0 < bs && bs < wantSize) {
@ -216,15 +210,18 @@ public final class DfsPackFile extends BlockBasedFile {
} else if (bs <= 0) {
bs = wantSize;
}
PackIndex idx = PackIndex
.read(new BufferedInputStream(in, bs));
PackIndex idx = PackIndex.read(
new BufferedInputStream(in, bs));
int sz = (int) Math.min(
idx.getObjectCount() * REC_SIZE,
Integer.MAX_VALUE);
ctx.stats.readIdxBytes += rc.position();
return new DfsBlockCache.Ref<>(idxKey, 0, sz, idx);
index = idx;
return new DfsBlockCache.Ref<>(idxKey, 0,
sz, idx);
} finally {
ctx.stats.readIdxMicros += elapsedMicros(start);
ctx.stats.readIdxMicros += elapsedMicros(
start);
}
} catch (EOFException e) {
throw new IOException(MessageFormat.format(
@ -236,15 +233,15 @@ public final class DfsPackFile extends BlockBasedFile {
desc.getFileName(INDEX)), e);
}
});
PackIndex idx = idxref.get();
if (index == null && idx != null) {
index = idx;
}
return index;
} catch (IOException e) {
invalid = true;
throw e;
}
PackIndex idx = idxref.get();
if (idx != null) {
index = idxref;
}
return idx;
}
}
@ -257,30 +254,24 @@ public final class DfsPackFile extends BlockBasedFile {
return null;
}
DfsBlockCache.Ref<PackBitmapIndex> idxref = bitmapIndex;
if (idxref != null) {
PackBitmapIndex bmidx = idxref.get();
if (bmidx != null) {
return bmidx;
}
if (bitmapIndex != null) {
return bitmapIndex;
}
synchronized (initLock) {
idxref = bitmapIndex;
if (idxref != null) {
PackBitmapIndex bmidx = idxref.get();
if (bmidx != null) {
return bmidx;
}
if (bitmapIndex != null) {
return bitmapIndex;
}
PackIndex idx = idx(ctx);
PackReverseIndex revidx = getReverseIdx(ctx);
DfsStreamKey bitmapKey = desc.getStreamKey(BITMAP_INDEX);
idxref = cache.getOrLoadRef(bitmapKey, () -> {
DfsBlockCache.Ref<PackBitmapIndex> idxref = cache
.getOrLoadRef(bitmapKey, () -> {
ctx.stats.readBitmap++;
long start = System.nanoTime();
try (ReadableChannel rc = ctx.db.openFile(desc, BITMAP_INDEX)) {
try (ReadableChannel rc = ctx.db.openFile(desc,
BITMAP_INDEX)) {
long size;
PackBitmapIndex bmidx;
try {
@ -300,59 +291,53 @@ public final class DfsPackFile extends BlockBasedFile {
ctx.stats.readIdxMicros += elapsedMicros(start);
}
int sz = (int) Math.min(size, Integer.MAX_VALUE);
return new DfsBlockCache.Ref<>(bitmapKey, 0, sz, bmidx);
bitmapIndex = bmidx;
return new DfsBlockCache.Ref<>(bitmapKey, 0, sz,
bmidx);
} catch (EOFException e) {
throw new IOException(
MessageFormat.format(DfsText.get().shortReadOfIndex,
desc.getFileName(BITMAP_INDEX)),
e);
throw new IOException(MessageFormat.format(
DfsText.get().shortReadOfIndex,
desc.getFileName(BITMAP_INDEX)), e);
} catch (IOException e) {
throw new IOException(
MessageFormat.format(DfsText.get().cannotReadIndex,
desc.getFileName(BITMAP_INDEX)),
e);
throw new IOException(MessageFormat.format(
DfsText.get().cannotReadIndex,
desc.getFileName(BITMAP_INDEX)), e);
}
});
PackBitmapIndex bmidx = idxref.get();
if (bmidx != null) {
bitmapIndex = idxref;
if (bitmapIndex == null && bmidx != null) {
bitmapIndex = bmidx;
}
return bmidx;
return bitmapIndex;
}
}
PackReverseIndex getReverseIdx(DfsReader ctx) throws IOException {
DfsBlockCache.Ref<PackReverseIndex> revref = reverseIndex;
if (revref != null) {
PackReverseIndex revidx = revref.get();
if (revidx != null) {
return revidx;
}
if (reverseIndex != null) {
return reverseIndex;
}
synchronized (initLock) {
revref = reverseIndex;
if (revref != null) {
PackReverseIndex revidx = revref.get();
if (revidx != null) {
return revidx;
}
if (reverseIndex != null) {
return reverseIndex;
}
PackIndex idx = idx(ctx);
DfsStreamKey revKey = new DfsStreamKey.ForReverseIndex(
desc.getStreamKey(INDEX));
revref = cache.getOrLoadRef(revKey, () -> {
DfsBlockCache.Ref<PackReverseIndex> revref = cache
.getOrLoadRef(revKey, () -> {
PackReverseIndex revidx = new PackReverseIndex(idx);
int sz = (int) Math.min(idx.getObjectCount() * 8,
Integer.MAX_VALUE);
reverseIndex = revidx;
return new DfsBlockCache.Ref<>(revKey, 0, sz, revidx);
});
PackReverseIndex revidx = revref.get();
if (revidx != null) {
reverseIndex = revref;
if (reverseIndex == null && revidx != null) {
reverseIndex = revidx;
}
return revidx;
return reverseIndex;
}
}

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