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Fix failed to delete an empty directory due to cache evict #18675

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Fix failed to delete an empty directory due to cache evict #18675

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517f745
Fix the issue of deleting empty directories failing due to cache evic…
gp1314 Aug 26, 2024
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gp1314 Aug 26, 2024
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8 changes: 6 additions & 2 deletions core/server/master/src/main/java/alluxio/master/metastore/caching/CachingInodeStore.java
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Original file line number Diff line number Diff line change
Expand Up @@ -236,8 +236,7 @@ public boolean hasChildren(InodeDirectoryView inode, ReadOption option) {
if (cached.isPresent()) {
return !cached.get().isEmpty();
}
return !mListingCache.getDataFromBackingStore(inode.getId(), option).isEmpty()
|| mBackingStore.hasChildren(inode);
return !mListingCache.getDataFromBackingStore(inode.getId(), option).isEmpty();
}

@VisibleForTesting
Expand Down Expand Up @@ -854,6 +853,11 @@ private void evict() {
mWeight.get(), System.currentTimeMillis() - startTime);
}

@VisibleForTesting
void evictForTesting() {
evict();
}

private int weight(ListingCacheEntry entry) {
Preconditions.checkNotNull(entry);
Preconditions.checkNotNull(entry.mChildren);
Expand Down
24 changes: 23 additions & 1 deletion ...c/test/java/alluxio/master/metastore/caching/CachingInodeStoreMockedBackingStoreTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,8 @@ public class CachingInodeStoreMockedBackingStoreTest {
ImmutableMap.of(PropertyKey.MASTER_METASTORE_INODE_CACHE_MAX_SIZE, CACHE_SIZE,
PropertyKey.MASTER_METASTORE_INODE_CACHE_EVICT_BATCH_SIZE, 5,
PropertyKey.LEAK_DETECTOR_LEVEL, ResourceLeakDetector.Level.PARANOID,
PropertyKey.LEAK_DETECTOR_EXIT_ON_LEAK, true),
PropertyKey.LEAK_DETECTOR_EXIT_ON_LEAK, true,
PropertyKey.MASTER_METASTORE_INODE_CACHE_LOW_WATER_MARK_RATIO, 0),
Configuration.modifiableGlobal());

@Before
Expand Down Expand Up @@ -335,6 +336,27 @@ public void skipCache() throws Exception {
assertEquals(0, mStore.mInodeCache.getCacheMap().size());
}

@Test
public void evictInodeForTestHasChildren() throws Exception {
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thanks for adding this test case! My understanding is, once your code is merged, this test case is no longer needed right? In other words, if your code is merged, assertEquals(false, mStore.hasChildren(myTestdir)); will return false.

MutableInodeDirectory myTestdir =
MutableInodeDirectory.create(500, 0, "evicttest", CreateDirectoryContext.defaults());
mStore.writeNewInode(myTestdir);
mStore.mListingCache.evictForTesting();
mStore.mEdgeCache.flush();
mStore.mInodeCache.flush();

long id = 6000;
MutableInodeFile child =
MutableInodeFile.create(id, 500, "child" + id, 0, CreateFileContext.defaults());
mStore.writeNewInode(child);
mStore.addChild(500, child);

mStore.mEdgeCache.flush();

mStore.removeInodeAndParentEdge(child);
assertEquals(false, mStore.hasChildren(myTestdir));
}

private void verifyNoBackingStoreReads() {
verify(mBackingStore, times(0)).getChild(anyLong(), anyString());
verify(mBackingStore, times(0)).getChildId(anyLong(), anyString());
Expand Down
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