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https://issues.apache.org/jira/browse/HBASE-29464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

haosen chen resolved HBASE-29464.
---------------------------------
    Resolution: Duplicate

> CLONE - Serial replication blocking in 
> SerialReplicationChecker#waitUntilCanPush
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-29464
>                 URL: https://issues.apache.org/jira/browse/HBASE-29464
>             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: haosen chen
>            Priority: Major
>
> 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|width=986,height=454!
> I randomly select a node to see the delay of replication,As show
> !image-2025-05-16-09-52-25-251.png|width=993,height=190!
> Blocking code location, As follows the stack:
> {code:java}
> // code placeholder
> "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){code}
>  
> 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
> {code:java}
> // code placeholder
> public void waitUntilCanPush(Entry entry, Cell firstCellInEdit)
>   throws IOException, InterruptedException {
>   byte[] row = CellUtil.cloneRow(firstCellInEdit);
>   while (!canPush(entry, row)) {
>     LOG.debug("Can not push {}, wait", entry);
>     Thread.sleep(waitTimeMs);
>   }
> } {code}
>  



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