Longping Jie created HBASE-29320:
------------------------------------

             Summary: Serial replication blocking
                 Key: HBASE-29320
                 URL: https://issues.apache.org/jira/browse/HBASE-29320
             Project: HBase
          Issue Type: Bug
          Components: Replication
    Affects Versions: 2.6.2
         Environment: Cluster A version 2.2.7, Cluster B version 2.6.1

B -> A 's replication is enabled
            Reporter: Longping Jie
         Attachments: image-2025-05-16-09-50-32-605.png, 
image-2025-05-16-09-52-25-251.png

We have two hbase clusters that enable replciation and set up serial 
replication.

Cluster A version 2.2.7, Cluster B version 2.6.1

It is normal for a long time after replication is enabled, After that, there is 
no sign, B -> A's replication source queue blocked, As shown

!image-2025-05-16-09-50-32-605.png!

I randomly select a node to see the delay of replication,As show

!image-2025-05-16-09-52-25-251.png!

Blocking code location, As follows the stack:
"regionserver/hbase-10:16020.replicationSource.shipperhbase-10%2C16020%2C1747312708324,peerId"
 #627 daemon prio=5 os_prio=0 tid=0x00007f9400b8a800 nid=0x2cf8 waiting on 
condition [0x00007f44470d9000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00007f89fff3e820> (a 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467)
at 
org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReader.poll(ReplicationSourceWALReader.java:313)
at 
org.apache.hadoop.hbase.replication.regionserver.SerialReplicationSourceWALReader.poll(SerialReplicationSourceWALReader.java:35)
at 
org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceShipper.run(ReplicationSourceShipper.java:109)
 
"regionserver/hbase-10:16020.replicationSource.wal-reader.hbase-10%2C16020%2C1747312708324,newHbase227"
 #628 daemon prio=5 os_prio=0 tid=0x00007f9400b8c800 nid=0x2cf6 waiting on 
condition [0x00007f44473da000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at 
org.apache.hadoop.hbase.replication.regionserver.SerialReplicationChecker.waitUntilCanPush(SerialReplicationChecker.java:270)
at 
org.apache.hadoop.hbase.replication.regionserver.SerialReplicationSourceWALReader.readWALEntries(SerialReplicationSourceWALReader.java:89)
at 
org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReader.run(ReplicationSourceWALReader.java:177)
at 
org.apache.hadoop.hbase.replication.regionserver.SerialReplicationSourceWALReader.run(SerialReplicationSourceWALReader.java:35)
 
"AsyncFSWAL-0-hdfs://coreHBaseProdHa/hbase-prefix:hbase-10,16020,1747312708324" 
#626 daemon prio=5 os_prio=0 tid=0x00007f9400b87000 nid=0x2cf5 waiting on 
condition [0x00007f44474db000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00007f89ffe20038> (a 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
 
Open the debug log for SerialReplicationChecker class,The logs are as follows:
2025-05-15T21:53:29,978 DEBUG 
[regionserver/hbase-10:16020.replicationSource.wal-reader.hbase-10%2C16020%2C1747312708324,peerId]
 regionserver.SerialReplicationChecker: Replication barrier for 
ad-instation/e3fdadb00255826881021b3baf97e976/1590=[#edits: 0 = <>]: 
ReplicationBarrierResult [barriers=[1585, 1589], state=OPEN, parentRegionNames=]
2025-05-15T21:53:29,979 DEBUG 
[regionserver/hbase-10:16020.replicationSource.wal-reader.hbase-10%2C16020%2C1747312708324,peerId]
 regionserver.SerialReplicationChecker: Previous range for 
ad-instation/e3fdadb00255826881021b3baf97e976/1590=[#edits: 0 = <>] has not 
been finished yet, give up
2025-05-15T21:53:29,979 DEBUG 
[regionserver/hbase-10:16020.replicationSource.wal-reader.hbase-10%2C16020%2C1747312708324,peerId]
 regionserver.SerialReplicationChecker: Can not push 
ad-instation/e3fdadb00255826881021b3baf97e976/1590=[#edits: 0 = <>], wait
 
I don't know why,  replication keeps getting stuck inside 
SerialReplicationChecker#waitUntilCanPush
 



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