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HDFS-14476. lock too long when fix inconsistent blocks between disk and in-memory. Contributed by Sean Chow.

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This commit is contained in:
Wei-Chiu Chuang 2019-12-06 11:37:04 -08:00
parent 76bb297db9
commit 313b76f8e9
1 changed files with 14 additions and 1 deletions
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15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java
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@ -66,7 +66,7 @@ public class DirectoryScanner implements Runnable {
LoggerFactory.getLogger(DirectoryScanner.class); LoggerFactory.getLogger(DirectoryScanner.class);
private static final int DEFAULT_MAP_SIZE = 32768; private static final int DEFAULT_MAP_SIZE = 32768;
private static final int RECONCILE_BLOCKS_BATCH_SIZE = 1000;
private final FsDatasetSpi<?> dataset; private final FsDatasetSpi<?> dataset;
private final ExecutorService reportCompileThreadPool; private final ExecutorService reportCompileThreadPool;
private final ScheduledExecutorService masterThread; private final ScheduledExecutorService masterThread;
@ -424,10 +424,23 @@ void shutdown() {
*/ */
@VisibleForTesting @VisibleForTesting
public void reconcile() throws IOException { public void reconcile() throws IOException {
LOG.debug("reconcile start DirectoryScanning");
scan(); scan();
// HDFS-14476: run checkAndUpadte with batch to avoid holding the lock too
// long
int loopCount = 0;
for (final Map.Entry<String, ScanInfo> entry : diffs.getEntries()) { for (final Map.Entry<String, ScanInfo> entry : diffs.getEntries()) {
dataset.checkAndUpdate(entry.getKey(), entry.getValue()); dataset.checkAndUpdate(entry.getKey(), entry.getValue());
if (loopCount % RECONCILE_BLOCKS_BATCH_SIZE == 0) {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// do nothing
}
}
loopCount++;
} }
if (!retainDiffs) { if (!retainDiffs) {