Haibo Sun created FLINK-12547:
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Summary: Deadlock when the task thread downloads jars using
BlobClient
Key: FLINK-12547
URL: https://issues.apache.org/jira/browse/FLINK-12547
Project: Flink
Issue Type: Bug
Components: Runtime / Operators
Affects Versions: 1.8.0
Reporter: Haibo Sun
Assignee: Haibo Sun
The jstack is as follows (this jstack is from an old Flink version, but the
master branch has the same problem).
{code:java}
"Source: Custom Source (76/400)" #68 prio=5 os_prio=0 tid=0x00007f8139cd3000
nid=0xe2 runnable [0x00007f80da5fd000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at org.apache.flink.runtime.blob.BlobInputStream.read(BlobInputStream.java:152)
at org.apache.flink.runtime.blob.BlobInputStream.read(BlobInputStream.java:140)
at
org.apache.flink.runtime.blob.BlobClient.downloadFromBlobServer(BlobClient.java:164)
at
org.apache.flink.runtime.blob.AbstractBlobCache.getFileInternal(AbstractBlobCache.java:181)
at
org.apache.flink.runtime.blob.PermanentBlobCache.getFile(PermanentBlobCache.java:206)
at
org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager.registerTask(BlobLibraryCacheManager.java:120)
- locked <0x000000062cf2a188> (a java.lang.Object)
at
org.apache.flink.runtime.taskmanager.Task.createUserCodeClassloader(Task.java:968)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:604)
at java.lang.Thread.run(Thread.java:834)
Locked ownable synchronizers:
- None
{code}
The reason is that SO_TIMEOUT is not set in the socket connection of the blob
client. When the network packet loss seriously due to the high CPU load of the
machine, the blob client connection fails to perceive that the server has been
disconnected, which results in blocking in the native method.
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