Details
-
Bug
-
Status: Closed
-
Major
-
Resolution: Fixed
-
2.6.0
-
None
Description
I'm using 2.6.0 and noticed that sometime DN's heartbeat were delayed for very long time, say more than 100 seconds. I get the jstack twice and looks like they are all blocked (at getStorageReport) by dataset lock, and which is held by a thread that is calling createTemporary, which again is blocked to wait earlier incarnation writer to exit.
The heartbeat thread stack:
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeImpl.getDfsUsed(FsVolumeImpl.java:152)
- waiting to lock <0x00000007b01428c0> (a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getStorageReports(FsDatasetImpl.java:144) - locked <0x00000007b0140ed0> (a java.lang.Object)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:575)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:680)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:850)
at java.lang.Thread.run(Thread.java:662)
The DataXceiver thread holds the dataset lock:
"DataXceiver for client at XXXXX" daemon prio=10 tid=0x00007f14041e6480 nid=0x52bc in Object.wait() [0x00007f11d78f7000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Thread.join(Thread.java:1194)
locked <0x00000007a33b85d8> (a org.apache.hadoop.util.Daemon)
at org.apache.hadoop.hdfs.server.datanode.ReplicaInPipeline.stopWriter(ReplicaInPipeline.java:183)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createTemporary(FsDatasetImpl.java:1231)
locked <0x00000007b01428c0> (a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createTemporary(FsDatasetImpl.java:114)
at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:179)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:615)
at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137)
at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:235)
at java.lang.Thread.run(Thread.java:662)
Attachments
Attachments
Issue Links
- is related to
-
HDFS-11260 Slow writer threads are not stopped
-
- Open
-
-
HDFS-7212 FsDatasetImpl#createTemporary sometimes holds the FSDatasetImpl lock for a very long time
-
- Reopened
-
- relates to
-
HDFS-7060 Avoid taking locks when sending heartbeats from the DataNode
-
- Resolved
-