[FLINK-13878] Flink CLI fails (TimeoutException) for unknown reason

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Abandoned
• Affects Version/s: 1.8.1
• Component/s: Command Line Client, Runtime / Coordination
• Assignee: Unassigned
• Reporter: Mitch Wasson
• Created: 27/Aug/19 18:41
• Updated: 06/Nov/20 10:23
• Resolved: 06/Nov/20 10:23

Description

We are running Flink 1.8.1 in HA mode with Zookeeper 3.4.11.

When we list/submit/cancel from the CLI on a job manager, the operation fails with a TimeoutException. Here is an example:

$ ./bin/flink list
Waiting for response... ------------------------------------------------------------
The program finished with the following exception:
org.apache.flink.util.FlinkException: Failed to retrieve job list.
at org.apache.flink.client.cli.CliFrontend.listJobs(CliFrontend.java:448)
at org.apache.flink.client.cli.CliFrontend.lambda$list$0(CliFrontend.java:430)
at org.apache.flink.client.cli.CliFrontend.runClusterAction(CliFrontend.java:985)
at org.apache.flink.client.cli.CliFrontend.list(CliFrontend.java:427)
at org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1053)
at org.apache.flink.client.cli.CliFrontend.lambda$main$11(CliFrontend.java:1126)
at org.apache.flink.runtime.security.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:30)
at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1126)
Caused by: java.util.concurrent.TimeoutException
at org.apache.flink.runtime.concurrent.FutureUtils$Timeout.run(FutureUtils.java:943)
at org.apache.flink.runtime.concurrent.DirectExecutorService.execute(DirectExecutorService.java:211)
at org.apache.flink.runtime.concurrent.FutureUtils.lambda$orTimeout$11(FutureUtils.java:361)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

When the same command is run with strace, we see that the CLI only manages to connect out to zookeeper and hangs on that connection:

$ strace -f -e connect ./bin/flink list
...
[pid 29445] connect(27, \{sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("gateway ip")}, 16) = 0
...
[pid 29445] connect(27,\{sa_family=AF_INET, sin_port=htons(2181), sin_addr=inet_addr("zookeeper ip")}, 16) = -1 EINPROGRESS (Operation now in progress)
strace: Process 29448 attached
Waiting for response...
...
Exception

The CLI is able to successfully connect to zookeeper and even appears to submit commands. This is verified by logs from zookeeper:

INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxnFactory@215] - Accepted socket connection from /JOB_MANAGER_IP:52074
DEBUG [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@880] - Session establishment request from client /JOB_MANAGER_IP:52074 client's lastZxid is 0x0
INFO [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:ZooKeeperServer@938] - Client attempting to establish new session at /JOB_MANAGER_IP:52074
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:createSession cxid:0x0 zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a
DEBUG [QuorumPeer[myid=3]/0.0.0.0:2181:CommitProcessor@164] - Committing request:: sessionid:0x30037a90dce0001 type:createSession cxid:0x0 zxid:0x10200000109 txntype:-10 reqpath:n/a
DEBUG [CommitProcessor:3:FinalRequestProcessor@89] - Processing request:: sessionid:0x30037a90dce0001 type:createSession cxid:0x0 zxid:0x10200000109 txntype:-10 reqpath:n/a
DEBUG [CommitProcessor:3:FinalRequestProcessor@161] - sessionid:0x30037a90dce0001 type:createSession cxid:0x0 zxid:0x10200000109 txntype:-10 reqpath:n/a
INFO [CommitProcessor:3:ZooKeeperServer@683] - Established session 0x30037a90dce0001 with negotiated timeout 40000 for client /JOB_MANAGER_IP:52074
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x1 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink
DEBUG [CommitProcessor:3:FinalRequestProcessor@89] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x1 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink
DEBUG [CommitProcessor:3:FinalRequestProcessor@161] - sessionid:0x30037a90dce0001 type:exists cxid:0x1 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x2 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME
DEBUG [CommitProcessor:3:FinalRequestProcessor@89] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x2 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME
DEBUG [CommitProcessor:3:FinalRequestProcessor@161] - sessionid:0x30037a90dce0001 type:exists cxid:0x2 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x3 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink
DEBUG [CommitProcessor:3:FinalRequestProcessor@89] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x3 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink
DEBUG [CommitProcessor:3:FinalRequestProcessor@161] - sessionid:0x30037a90dce0001 type:exists cxid:0x3 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x4 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME
DEBUG [CommitProcessor:3:FinalRequestProcessor@89] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x4 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME
DEBUG [CommitProcessor:3:FinalRequestProcessor@161] - sessionid:0x30037a90dce0001 type:exists cxid:0x4 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x5 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME/leader
DEBUG [CommitProcessor:3:FinalRequestProcessor@89] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x5 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME/leader
DEBUG [CommitProcessor:3:FinalRequestProcessor@161] - sessionid:0x30037a90dce0001 type:exists cxid:0x5 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME/leader
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x6 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME/leader/rest_server_lock
DEBUG [FollowerRequestProcessor:3:CommitProcessor@174] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x7 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink
DEBUG [CommitProcessor:3:FinalRequestProcessor@89] - Processing request:: sessionid:0x30037a90dce0001 type:exists cxid:0x6 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME/leader/rest_server_lock
DEBUG [CommitProcessor:3:FinalRequestProcessor@161] - sessionid:0x30037a90dce0001 type:exists cxid:0x6 zxid:0xfffffffffffffffe txntype:unknown reqpath:/flink/CLUSTER_NAME/leader/rest_server_lock

Based on those logs I can speculate the the CLI has difficulty obtaining the rest server lock, but I don't really know.

In case it matters, we recently upgraded to Flink 1.8.

Here are a few instances of similar issues we have found online which don't seem to have conclusive endings:

https://stackoverflow.com/questions/53716795/flink-1-6-timeoutexception-while-submitting-the-job

https://mail-archives.apache.org/mod_mbox/flink-user/201812.mbox/[e-mail]%3E

https://mail-archives.apache.org/mod_mbox/flink-user/201809.mbox/[e-mail]%3e