什么原因导致 Could not connect to BlobServer ？

Mon, 08 Mar 2021 17:36:22 -0800 

运行 1.12.2 standalone 集群，不定期会出现类似这种错误，请问这有可能是什么原因导致的？谢谢！

Caused by: java.io.IOException: Failed to fetch BLOB
fb90d0fce9ff3ad8353ea97e46f9c913/p-bc0d39187ed200f9df64f90463534862858961a2-2ff77a5adb95af29376c6699173c3969
from hb3-dev-gem-svc1-000/10.30.69.13:43003 and store it under
/home/gum/flink_tmp/blobStore-e82a4a09-0f9c-4846-902c-b18c6fd09dae/incoming/temp-00001153
        at
org.apache.flink.runtime.blob.BlobClient.downloadFromBlobServer(BlobClient.java:167)
        at
org.apache.flink.runtime.blob.AbstractBlobCache.getFileInternal(AbstractBlobCache.java:166)
        at
org.apache.flink.runtime.blob.PermanentBlobCache.getFile(PermanentBlobCache.java:187)
        at
org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager$LibraryCacheEntry.createUserCodeClassLoader(BlobLibraryCacheManager.java:251)
        at
org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager$LibraryCacheEntry.getOrResolveClassLoader(BlobLibraryCacheManager.java:228)
        at
org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager$LibraryCacheEntry.access$1100(BlobLibraryCacheManager.java:199)
        at
org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager$DefaultClassLoaderLease.getOrResolveClassLoader(BlobLibraryCacheManager.java:333)
        at
org.apache.flink.runtime.taskmanager.Task.createUserCodeClassloader(Task.java:983)
        at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:632)
        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:570)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Could not connect to BlobServer at address
hb3-dev-gem-svc1-000/10.30.69.13:43003
        at org.apache.flink.runtime.blob.BlobClient.<init>(BlobClient.java:102)
        at
org.apache.flink.runtime.blob.BlobClient.downloadFromBlobServer(BlobClient.java:137)
        ... 10 more
Caused by: java.net.UnknownHostException: hb3-dev-gem-svc1-000
        at
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:607)
        at org.apache.flink.runtime.blob.BlobClient.<init>(BlobClient.java:96)
        ... 11 more




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