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HADOOP-18756. S3A prefetch - CachingBlockManager to use AtomicBoolean for closed flag #5718

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merged 4 commits into from
Jun 14, 2023
Merged

HADOOP-18756. S3A prefetch - CachingBlockManager to use AtomicBoolean for closed flag #5718

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0adac72
HADOOP-18756. S3A prefetch - CachingBlockManager to use AtomicBoolean…
virajjasani Jun 5, 2023
7dd24ba
Merge branch 'trunk' of github.com:apache/hadoop into HADOOP-18756-trunk
virajjasani Jun 7, 2023
7f48042
addendum
virajjasani Jun 8, 2023
325a030
addendum
virajjasani Jun 12, 2023
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56 changes: 26 additions & 30 deletions ...doop-common/src/main/java/org/apache/hadoop/fs/impl/prefetch/SingleFilePerBlockCache.java
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableSet;
Expand Down Expand Up @@ -68,7 +69,7 @@ public class SingleFilePerBlockCache implements BlockCache {
*/
private int numGets = 0;

private boolean closed;
private final AtomicBoolean closed;

private final PrefetchingStatistics prefetchingStatistics;

Expand Down Expand Up @@ -174,6 +175,7 @@ private boolean takeLock(LockType lockType, long timeout, TimeUnit unit) {
*/
public SingleFilePerBlockCache(PrefetchingStatistics prefetchingStatistics) {
this.prefetchingStatistics = requireNonNull(prefetchingStatistics);
this.closed = new AtomicBoolean(false);
}

/**
Expand Down Expand Up @@ -207,7 +209,7 @@ public int size() {
*/
@Override
public void get(int blockNumber, ByteBuffer buffer) throws IOException {
if (closed) {
if (closed.get()) {
return;
}

Expand Down Expand Up @@ -262,7 +264,7 @@ private Entry getEntry(int blockNumber) {
@Override
public void put(int blockNumber, ByteBuffer buffer, Configuration conf,
LocalDirAllocator localDirAllocator) throws IOException {
if (closed) {
if (closed.get()) {
return;
}

Expand Down Expand Up @@ -333,37 +335,31 @@ protected Path getCacheFilePath(final Configuration conf,

@Override
public void close() throws IOException {
if (closed) {
return;
}

closed = true;
if (closed.compareAndSet(false, true)) {
LOG.debug(getStats());
int numFilesDeleted = 0;

LOG.info(getStats());
int numFilesDeleted = 0;

for (Entry entry : blocks.values()) {
boolean lockAcquired = entry.takeLock(Entry.LockType.WRITE, PREFETCH_WRITE_LOCK_TIMEOUT,
PREFETCH_WRITE_LOCK_TIMEOUT_UNIT);
if (!lockAcquired) {
LOG.error("Cache file {} deletion would not be attempted as write lock could not"
+ " be acquired within {} {}", entry.path, PREFETCH_WRITE_LOCK_TIMEOUT,
for (Entry entry : blocks.values()) {
boolean lockAcquired = entry.takeLock(Entry.LockType.WRITE, PREFETCH_WRITE_LOCK_TIMEOUT,
PREFETCH_WRITE_LOCK_TIMEOUT_UNIT);
continue;
}
try {
Files.deleteIfExists(entry.path);
prefetchingStatistics.blockRemovedFromFileCache();
numFilesDeleted++;
} catch (IOException e) {
LOG.debug("Failed to delete cache file {}", entry.path, e);
} finally {
entry.releaseLock(Entry.LockType.WRITE);
if (!lockAcquired) {
LOG.error("Cache file {} deletion would not be attempted as write lock could not"
+ " be acquired within {} {}", entry.path, PREFETCH_WRITE_LOCK_TIMEOUT,
PREFETCH_WRITE_LOCK_TIMEOUT_UNIT);
continue;
}
try {
Files.deleteIfExists(entry.path);
prefetchingStatistics.blockRemovedFromFileCache();
numFilesDeleted++;
} catch (IOException e) {
LOG.error("Failed to delete cache file {}", entry.path, e);
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ok, so this is moving from debug to error. why so?

if we do want to print this, it's not an error. at worst a warn.

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sure let me make it at least warn, this is likely going to be rare event and highlighting it would be helpful debugging stale file records in future.

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@virajjasani virajjasani Jun 12, 2023 •
edited
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with this new addendum (log level change: ERROR to WARN), i re-ran the test suite again (without scale profile, since the addendum change is trivial)

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re-tested the latest state of the PR with mvn clean verify -Dparallel-tests -DtestsThreadCount=8 -Dscale -Dprefetch against us-west-2

} finally {
entry.releaseLock(Entry.LockType.WRITE);
}
}
}

if (numFilesDeleted > 0) {
LOG.info("Deleted {} cache files", numFilesDeleted);
LOG.debug("Prefetch cache close: Deleted {} cache files", numFilesDeleted);
}
}

Expand Down