HDFS-16438. Avoid holding read locks for a long time when scanDatanodeStorage #3928

tomscut · 2022-01-25T15:29:52Z

At the time of decommission, if use DatanodeAdminBackoffMonitor, there is a heavy operation: scanDatanodeStorage. If the number of blocks on a storage is large(more than 5 hundred thousand), and GC performance is also poor, it may hold read lock for a long time, we should optimize it.

2021-12-22 07:49:01,279 INFO  namenode.FSNamesystem (FSNamesystemLock.java:readUnlock(220)) - FSNamesystem scanDatanodeStorage read lock held for 5491 ms via
java.lang.Thread.getStackTrace(Thread.java:1552)
org.apache.hadoop.util.StringUtils.getStackTrace(StringUtils.java:1032)
org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.readUnlock(FSNamesystemLock.java:222)
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.readUnlock(FSNamesystem.java:1641)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.scanDatanodeStorage(DatanodeAdminBackoffMonitor.java:646)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.checkForCompletedNodes(DatanodeAdminBackoffMonitor.java:417)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.check(DatanodeAdminBackoffMonitor.java:300)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.run(DatanodeAdminBackoffMonitor.java:201)
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
    Number of suppressed read-lock reports: 0
    Longest read-lock held interval: 5491

…eStorage

hadoop-yetus · 2022-01-25T23:00:10Z

💔 -1 overall

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tomscut · 2022-01-26T05:03:24Z

Next: fix the transitive dependency of the hbase2 profile; update reload4j to 1.2.18.3 (latest)

Hi @jojochuang , I want to confirm whether this comment is related to this issue? Thanks.

jojochuang · 2022-01-26T06:52:27Z

Sorry. My bad. Posted to the wrong PR.

sodonnel · 2022-01-26T13:58:32Z

I am not sure if it is safe to drop the read lock while iterating over the blocks in a StorageInfo as the blocks could change when you drop the lock.

Looking at the code in DatanodeStorageInfo, we can add a block to the list, which always adds to the head of the list. The worst case here, is we don't consider some block, but it would be caught by the rescan at the end, so that is not a big problem.

However we can remove a block. Lets say we stop iterating at blockX and drop the lock.

Then a IBR comes in and gets processed, removing that block from the storage.

The iterator will be holding a reference to that blockInfo object as current, and it is expected to call next on it to get the next block Info.

The remove block code in BlockInfo.java looks like:

BlockInfo listRemove(BlockInfo head, DatanodeStorageInfo storage) {
    if (head == null) {
      return null;
    }
    int dnIndex = this.findStorageInfo(storage);
    if (dnIndex < 0) { // this block is not on the data-node list
      return head;
    }

    BlockInfo next = this.getNext(dnIndex);
    BlockInfo prev = this.getPrevious(dnIndex);
    this.setNext(dnIndex, null);
    this.setPrevious(dnIndex, null);
    if (prev != null) {
      prev.setNext(prev.findStorageInfo(storage), next);
    }
    if (next != null) {
      next.setPrevious(next.findStorageInfo(storage), prev);
    }
    if (this == head) { // removing the head
      head = next;
    }
    return head;
  }

It is basically unlinking itself from the linked list, and then sets its own prev and next to null. Then the iterator calls getNext on it:

  BlockInfo getNext(int index) {
    assert this.triplets != null : "BlockInfo is not initialized";
    assert index >= 0 && index * 3 + 2 < triplets.length : "Index is out of bound";
    BlockInfo info = (BlockInfo)triplets[index * 3 + 2];
    assert info == null || info.getClass().getName().startsWith(
        BlockInfo.class.getName()) :
        "BlockInfo is expected at " + (index * 3 + 2);
    return info;
  }

If the case of the current blockInfo having a null next, the iterator will get null, and think it has reached the end of the list and exit wrongly.

This would be a rare bug to hit, as you would need to drop the lock and then the next block to consume from the list would need to be removed from the list, but it is one of those things that will happen from time to time and be very hard to explain.

5M blocks on a single storage is a lot - dropping and re-locking at the storage level was supposed to handle DNs with millions of blocks, but each storage only having a small number.

Does this pause occur once per storage at the start and end of decommission for each node?

tomscut · 2022-01-27T02:46:58Z

Thanks @sodonnel for your comments and detailed explanations.

I'm sorry I said the wrong number 5M, we have more than 10 million blocks per node, and 20 disks, so more than 500,000 blocks per storage.

Your explanation makes sense to me. During scanDatanodeStorage, there is listRemove behavior at the same time, so there will indeed be inconsistency.

Can we copy the blocks of each storage to a list first? This is a lightweight operation. Then scan the list and release the lock once for part of scan to reduce the lock holding time. After scan, clear the list. Do you think this is feasible?

sodonnel · 2022-01-27T10:43:38Z

This is the scan logic:

    for (DatanodeStorageInfo s : storage) {
      namesystem.readLock();
      try {
        // As the lock is dropped and re-taken between each storage, we need
        // to check the storage is still present before processing it, as it
        // may have been removed.
        if (dn.getStorageInfo(s.getStorageID()) == null) {
          continue;
        }
        Iterator<BlockInfo> it = s.getBlockIterator();
        while (it.hasNext()) {
          BlockInfo b = it.next();
          if (!initialScan || dn.isEnteringMaintenance()) {
            // this is a rescan, so most blocks should be replicated now,
            // or this node is going into maintenance. On a healthy
            // cluster using racks or upgrade domain, a node should be
            // able to go into maintenance without replicating many blocks
            // so we will check them immediately.
            if (!isBlockReplicatedOk(dn, b, false, null)) {
              blockList.put(b, null);
            }
          } else {
            blockList.put(b, null);
          }
          numBlocksChecked++;
        }
      } finally {
        namesystem.readUnlock();
      }
    }

The rescan would be more expensive as it needs to check if each block is correctly replicated, and also if you are putting a node to maintenance. The rescan happens at the end. The initial scan basically puts all the entries into a list, so it should already be lightweight.

Do you know if the pause is happening at the end of decommission during the re-scan? If so, we should probably refactor it to not do the isBlockReplicatedOk() check under the lock.

tomscut · 2022-01-27T12:05:06Z

Hi @sodonnel , thanks for your comments.

This is the stack:

2021-12-21 16:56:21,203 INFO  namenode.FSNamesystem (FSNamesystemLock.java:readUnlock(220)) - FSNamesystem scanDatanodeStorage read lock held for 16013 ms via
java.lang.Thread.getStackTrace(Thread.java:1552)
org.apache.hadoop.util.StringUtils.getStackTrace(StringUtils.java:1032)
org.apache.hadoop.hdfs.server.namenode.FSNamesystemLock.readUnlock(FSNamesystemLock.java:222)
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.readUnlock(FSNamesystem.java:1641)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.scanDatanodeStorage(DatanodeAdminBackoffMonitor.java:646)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.checkForCompletedNodes(DatanodeAdminBackoffMonitor.java:417)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.check(DatanodeAdminBackoffMonitor.java:300)
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeAdminBackoffMonitor.run(DatanodeAdminBackoffMonitor.java:201)
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
	Number of suppressed read-lock reports: 0
	Longest read-lock held interval: 16013

I think this is at the end of decommission, because we can see checkForCompletedNodes, initialScan must be false.

sodonnel · 2022-01-27T14:00:43Z

Yea looks likes it is all the isReplicatedOK that is making it slow. What about a change like this, to move the replicated check outside of the lock:

--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.java
@@ -652,24 +652,27 @@ private void scanDatanodeStorage(DatanodeDescriptor dn,
         Iterator<BlockInfo> it = s.getBlockIterator();
         while (it.hasNext()) {
           BlockInfo b = it.next();
-          if (!initialScan || dn.isEnteringMaintenance()) {
-            // this is a rescan, so most blocks should be replicated now,
-            // or this node is going into maintenance. On a healthy
-            // cluster using racks or upgrade domain, a node should be
-            // able to go into maintenance without replicating many blocks
-            // so we will check them immediately.
-            if (!isBlockReplicatedOk(dn, b, false, null)) {
-              blockList.put(b, null);
-            }
-          } else {
-            blockList.put(b, null);
-          }
+          blockList.put(b, null);
           numBlocksChecked++;
         }
       } finally {
         namesystem.readUnlock();
       }
     }
+    if (!initialScan || dn.isEnteringMaintenance()) {
+      // this is a rescan, so most blocks should be replicated now,
+      // or this node is going into maintenance. On a healthy
+      // cluster using racks or upgrade domain, a node should be
+      // able to go into maintenance without replicating many blocks
+      // so we will check them immediately.
+      Iterator<BlockInfo> iterator = blockList.keySet().iterator();
+      while(iterator.hasNext()) {
+        BlockInfo b = iterator.next();
+        if (!isBlockReplicatedOk(dn, b, false, null)) {
+          iterator.remove();
+        }
+      }
+    }
   }

virajjasani · 2022-01-27T15:42:41Z

...src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminBackoffMonitor.java

+          if (Time.monotonicNow() - beginTime > scanDatanodeStorageLockTimeMs) {
+            namesystem.readUnlock();
+            try {
+              Thread.sleep(1);


Is 1ms sleep time enough to remove lock starvation or we should add bit more?

Is 1ms sleep time enough to remove lock starvation or we should add bit more?

Thanks @virajjasani for your review, I am trying a new implementation now, this code may be replaced.

tomscut · 2022-01-28T02:43:14Z

+        if (!isBlockReplicatedOk(dn, b, false, null)) {

Hi @sodonnel , I just want to make sure that we don't have to take the inverse here? Please point me out if I understand wrong.

while(iterator.hasNext()) {
+        BlockInfo b = iterator.next();
+        if (isBlockReplicatedOk(dn, b, false, null)) {
+          iterator.remove();
+        }
+      }

tomscut · 2022-01-28T02:48:53Z

Thanks @sodonnel for your comments and suggestions, which make sense to me.

Moving the replicated check outside of the lock is a good idea, I'll update the code and do some testing.

sodonnel · 2022-01-28T10:28:52Z

+        if (!isBlockReplicatedOk(dn, b, false, null)) {
Hi @sodonnel , I just want to make sure that we don't have to take the inverse here? Please point me out if I understand wrong.
while(iterator.hasNext()) {
+        BlockInfo b = iterator.next();
+        if (isBlockReplicatedOk(dn, b, false, null)) {
+          iterator.remove();
+        }
+      }

Yes you are correct, my suggested code has it wrong. We need to remove from the list if it is replicated OK. The original code only added if it was not replicated OK.

tomscut · 2022-01-28T10:32:07Z

+        if (!isBlockReplicatedOk(dn, b, false, null)) {
Hi @sodonnel , I just want to make sure that we don't have to take the inverse here? Please point me out if I understand wrong.
while(iterator.hasNext()) {
+        BlockInfo b = iterator.next();
+        if (isBlockReplicatedOk(dn, b, false, null)) {
+          iterator.remove();
+        }
+      }
Yes you are correct, my suggested code has it wrong. We need to remove from the list if it is replicated OK. The original code only added if it was not replicated OK.

Thanks @sodonnel for your quick reply. I'll update the code and do some related tests later.

hadoop-yetus · 2022-01-28T19:41:30Z

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github-actions · 2025-11-18T00:23:33Z

We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
Thanks all for your contribution.

HDFS-16438. Avoid holding read locks for a long time when scanDatanod…

d8acbfe

…eStorage

virajjasani reviewed Jan 27, 2022

View reviewed changes

moving the replicated check outside of the lock

95535ac

github-actions bot added the Stale label Nov 18, 2025

github-actions bot closed this Nov 19, 2025

HDFS-16438. Avoid holding read locks for a long time when scanDatanodeStorage #3928

HDFS-16438. Avoid holding read locks for a long time when scanDatanodeStorage #3928

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