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https://issues.apache.org/jira/browse/FLINK-9336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16472273#comment-16472273
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ASF GitHub Bot commented on FLINK-9336:
---------------------------------------
Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/5993
Thanks for the work @sihuazhou and for reporting this @florianschmidt1994 !
This fixes the problem described in the JIRA but I will look at the PR a bit
more thoroughly on Monday at the latest and then merge it if everything is ok.
> Queryable state fails with Exception after task manager restore
> ---------------------------------------------------------------
>
> Key: FLINK-9336
> URL: https://issues.apache.org/jira/browse/FLINK-9336
> Project: Flink
> Issue Type: Bug
> Components: Queryable State
> Affects Versions: 1.5.0
> Reporter: Florian Schmidt
> Assignee: Sihua Zhou
> Priority: Blocker
> Fix For: 1.5.0
>
>
>
> The following steps can be used to reproduce the Exception:
> # Run an app with a FlatMap which exposes its MapState through Queryable
> State with RocksDB
> # Run a queryable state client: ✔️
> # Kill the TM
> # Start a new TM
> # Run a queryable state client: ❌ (StackTrace below)
>
> This happens if we run our queryable state client after the new TM has
> started and the app is running but *before the FlatMap has processed elements
> again*
>
> With a little help and some debugging I found out that very likely the reason
> is that in the _RocksDBMapState_ there is a private field _userKeyOffset,_
> which is initialised through the code path of
> _RocksDBMapState::serializeCurrentKeyAndNamespace_. This will only be called
> when processing an element and therefore accessing the state. If now the
> state is accessed before that through queryable state, this value will be 0
> and therefore the deserialization of the user key will fail as seen below.
>
> The observed stacktrace
>
> {code:java}
> Exception in thread "main" java.util.concurrent.ExecutionException:
> java.lang.RuntimeException: Failed request 0. Caused by:
> java.lang.RuntimeException: Failed request 0. Caused by:
> java.lang.RuntimeException: Error while processing request with ID 0. Caused
> by: java.lang.RuntimeException: Error while deserializing the user key. at
> org.apache.flink.contrib.streaming.state.RocksDBMapState$RocksDBMapEntry.getKey(RocksDBMapState.java:414)
> at
> org.apache.flink.queryablestate.client.state.serialization.KvStateSerializer.serializeMap(KvStateSerializer.java:220)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState.getSerializedValue(RocksDBMapState.java:288)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.getSerializedValue(KvStateServerHandler.java:107)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:84)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:48)
> at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.run(AbstractServerHandler.java:236)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748) Caused by: java.io.EOFException at
> java.io.DataInputStream.readFully(DataInputStream.java:197) at
> java.io.DataInputStream.readUTF(DataInputStream.java:609) at
> java.io.DataInputStream.readUTF(DataInputStream.java:564) at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:381)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState.deserializeUserKey(RocksDBMapState.java:341)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState.access$200(RocksDBMapState.java:61)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState$RocksDBMapEntry.getKey(RocksDBMapState.java:412)
> ... 11 more at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:95)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:48)
> at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.run(AbstractServerHandler.java:236)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748) at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.lambda$run$0(AbstractServerHandler.java:273)
> at
> java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
> at
> java.util.concurrent.CompletableFuture.uniWhenCompleteStage(CompletableFuture.java:778)
> at
> java.util.concurrent.CompletableFuture.whenComplete(CompletableFuture.java:2140)
> at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.run(AbstractServerHandler.java:236)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748) at
> java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
> at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895) at
> org.apache.flink.streaming.tests.queryablestate.QsStateClient.getMapState(QsStateClient.java:122)
> at
> org.apache.flink.streaming.tests.queryablestate.QsStateClient.main(QsStateClient.java:75)
> Caused by: java.lang.RuntimeException: Failed request 0. Caused by:
> java.lang.RuntimeException: Failed request 0. Caused by:
> java.lang.RuntimeException: Error while processing request with ID 0. Caused
> by: java.lang.RuntimeException: Error while deserializing the user key. at
> org.apache.flink.contrib.streaming.state.RocksDBMapState$RocksDBMapEntry.getKey(RocksDBMapState.java:414)
> at
> org.apache.flink.queryablestate.client.state.serialization.KvStateSerializer.serializeMap(KvStateSerializer.java:220)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState.getSerializedValue(RocksDBMapState.java:288)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.getSerializedValue(KvStateServerHandler.java:107)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:84)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:48)
> at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.run(AbstractServerHandler.java:236)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748) Caused by: java.io.EOFException at
> java.io.DataInputStream.readFully(DataInputStream.java:197) at
> java.io.DataInputStream.readUTF(DataInputStream.java:609) at
> java.io.DataInputStream.readUTF(DataInputStream.java:564) at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializer.deserialize(PojoSerializer.java:381)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState.deserializeUserKey(RocksDBMapState.java:341)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState.access$200(RocksDBMapState.java:61)
> at
> org.apache.flink.contrib.streaming.state.RocksDBMapState$RocksDBMapEntry.getKey(RocksDBMapState.java:412)
> ... 11 more at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:95)
> at
> org.apache.flink.queryablestate.server.KvStateServerHandler.handleRequest(KvStateServerHandler.java:48)
> at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.run(AbstractServerHandler.java:236)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748) at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.lambda$run$0(AbstractServerHandler.java:273)
> at
> java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
> at
> java.util.concurrent.CompletableFuture.uniWhenCompleteStage(CompletableFuture.java:778)
> at
> java.util.concurrent.CompletableFuture.whenComplete(CompletableFuture.java:2140)
> at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.run(AbstractServerHandler.java:236)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748) at
> org.apache.flink.queryablestate.network.AbstractServerHandler$AsyncRequestTask.lambda$run$0(AbstractServerHandler.java:273)
> at
> java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
> at
> java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
> at
> java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
> at
> java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)
> at
> org.apache.flink.queryablestate.client.proxy.KvStateClientProxyHandler.lambda$executeActionAsync$0(KvStateClientProxyHandler.java:146)
> at
> java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
> at
> java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
> at
> java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:748)
> {code}
>
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