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From "Till Rohrmann (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-8715) RocksDB does not propagate reconfiguration of serializer to the states
Date Thu, 12 Apr 2018 02:03:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-8715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Till Rohrmann updated FLINK-8715:
---------------------------------
    Fix Version/s:     (was: 1.5.1)
                       (was: 1.6.0)
                   1.5.0

> RocksDB does not propagate reconfiguration of serializer to the states
> ----------------------------------------------------------------------
>
>                 Key: FLINK-8715
>                 URL: https://issues.apache.org/jira/browse/FLINK-8715
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.3.2
>            Reporter: Arvid Heise
>            Priority: Blocker
>             Fix For: 1.5.0
>
>
> Any changes to the serializer done in #ensureCompability are lost during the state creation.
> In particular, [https://github.com/apache/flink/blob/master/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBValueState.java#L68]
always uses a fresh copy of the StateDescriptor.
> An easy fix is to pass the reconfigured serializer as an additional parameter in [https://github.com/apache/flink/blob/master/flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java#L1681]
, which can be retrieved through the side-output of getColumnFamily
> {code:java}
> kvStateInformation.get(stateDesc.getName()).f1.getStateSerializer()
> {code}
> I encountered it in 1.3.2 but the code in the master seems unchanged (hence the pointer
into master). I encountered it in ValueState, but I suspect the same issue can be observed
for all kinds of RocksDB states.



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