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Posted to issues@flink.apache.org by "Sihua Zhou (JIRA)" <ji...@apache.org> on 2018/05/11 15:11:00 UTC
[jira] [Assigned] (FLINK-9336) Queryable state fails with Exception
after task manager restore
[ https://issues.apache.org/jira/browse/FLINK-9336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sihua Zhou reassigned FLINK-9336:
---------------------------------
Assignee: Sihua Zhou
> 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: Major
>
>
> 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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