[
https://issues.apache.org/jira/browse/FLINK-10213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16704809#comment-16704809
]
ASF GitHub Bot commented on FLINK-10213:
----------------------------------------
dawidwys commented on a change in pull request #6862: [FLINK-10213] Task
managers cache a negative DNS lookup of the blob server indefinitely
URL: https://github.com/apache/flink/pull/6862#discussion_r237876381
##########
File path:
flink-runtime/src/test/java/org/apache/flink/runtime/blob/BlobClientTest.java
##########
@@ -487,4 +487,11 @@ private static void uploadJarFile(
validateGetAndClose(blobClient.getInternal(jobId,
blobKeys.get(0)), testFile);
}
}
+
+ @Test
+ public void testUnresolvedInetSocketAddress() throws Exception {
+ try (BlobClient client = new BlobClient(
+ InetSocketAddress.createUnresolved("localhost",
getBlobServer().getPort()), getBlobClientConfig())) {
+ }
Review comment:
Could you extend this test, so that it checks that it actually connects to
the `BlobServer`?
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
> Task managers cache a negative DNS lookup of the blob server indefinitely
> -------------------------------------------------------------------------
>
> Key: FLINK-10213
> URL: https://issues.apache.org/jira/browse/FLINK-10213
> Project: Flink
> Issue Type: Bug
> Components: TaskManager
> Affects Versions: 1.5.0
> Reporter: Joey Echeverria
> Assignee: Joey Echeverria
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.8.0
>
>
> When the task manager establishes a connection with the resource manager, it
> gets the hostname and port of the blob server and uses that to create an
> instance of an {{InetSocketAddress}}. Per the documentation of the
> constructor:
> {quote}An attempt will be made to resolve the hostname into an InetAddress.
> If that attempt fails, the address will be flagged as _unresolved_{quote}
> Flink never checks to see if the address was unresolved. Later when executing
> a task that needs to download from the blob server, it will use that same
> {{InetSocketAddress}} instance to attempt to connect a {{Socket}}. This will
> result in an exception similar to:
> {noformat}
> java.io.IOException: Failed to fetch BLOB
> 97799b827ef073e04178a99f0f40b00e/p-6d8ec2ad31337110819c7c3641fdb18d3793a7fb-72bf00066308f4b4d2a9c5aea593b41f
> from jobmanager:6124 and store it under
> /tmp/blobStore-d135961a-03cb-4542-af6d-cf378ff83c12/incoming/temp-00018669
> at
> org.apache.flink.runtime.blob.BlobClient.downloadFromBlobServer(BlobClient.java:191)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> at
> org.apache.flink.runtime.blob.AbstractBlobCache.getFileInternal(AbstractBlobCache.java:181)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> at
> org.apache.flink.runtime.blob.PermanentBlobCache.getFile(PermanentBlobCache.java:206)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> at
> org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager.registerTask(BlobLibraryCacheManager.java:120)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> at
> org.apache.flink.runtime.taskmanager.Task.createUserCodeClassloader(Task.java:863)
> [flink-dist_2.11-1.5.0.jar:1.5.0]
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:579)
> [flink-dist_2.11-1.5.0.jar:1.5.0]
> at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]
> Caused by: java.io.IOException: Could not connect to BlobServer at address
> flink-jobmanager:6124
> at org.apache.flink.runtime.blob.BlobClient.<init>(BlobClient.java:124)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> at
> org.apache.flink.runtime.blob.BlobClient.downloadFromBlobServer(BlobClient.java:165)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> ... 6 more
> Caused by: java.net.UnknownHostException: jobmanager
> at
> java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
> ~[?:1.8.0_171]
> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
> ~[?:1.8.0_171]
> at java.net.Socket.connect(Socket.java:589) ~[?:1.8.0_171]
> at java.net.Socket.connect(Socket.java:538) ~[?:1.8.0_171]
> at org.apache.flink.runtime.blob.BlobClient.<init>(BlobClient.java:118)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> at
> org.apache.flink.runtime.blob.BlobClient.downloadFromBlobServer(BlobClient.java:165)
> ~[flink-dist_2.11-1.5.0.jar:1.5.0]
> ... 6 more
> {noformat}
> Since the {{InetSocketAddress}} is re-used, you'll have repeated failures of
> any tasks that are executed on that task manager and the only current
> workaround is to manually restart the task manager.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
