[HDFS-16600] Fix deadlock of fine-grain lock for FsDatastImpl of DataNode.

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: datanode
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: ZanderXu
• Reporter: ZanderXu
• Created: 28/May/22 03:51
• Updated: 12/Feb/24 06:42
• Resolved: 17/Jun/22 14:07

Description

The UT org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.testSynchronousEviction failed, because happened deadlock, which is introduced by HDFS-16534.
DeadLock:

// org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.createRbw line 1588 need a read lock
try (AutoCloseableLock lock = lockManager.readLock(LockLevel.BLOCK_POOl,
        b.getBlockPoolId()))

// org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.evictBlocks line 3526 need a write lock
try (AutoCloseableLock lock = lockManager.writeLock(LockLevel.BLOCK_POOl, bpid))

Issue Links

• links to: GitHub Pull Request #4367