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https://issues.apache.org/jira/browse/FLINK-8639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369214#comment-16369214
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ASF GitHub Bot commented on FLINK-8639:
---------------------------------------
Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/5465#discussion_r169099355
--- Diff:
flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBMapState.java
---
@@ -319,6 +321,9 @@ private UV deserializeUserValue(byte[] rawValueBytes)
throws IOException {
/** The raw bytes of the value stored in RocksDB. */
private byte[] rawValueBytes;
+ /** The offset of User Key offset in raw key bytes. */
+ private final int userKeyOffset;
--- End diff --
This value is basically a constant on a per-backend level and we could
remember the value in the MapState itself, no need to replicate it into every
entry. It can then still be recalled from there for `deserializeUserKey(...)`.
> Fix always need to seek multiple times when iterator RocksDBMapState
> --------------------------------------------------------------------
>
> Key: FLINK-8639
> URL: https://issues.apache.org/jira/browse/FLINK-8639
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Affects Versions: 1.4.0
> Reporter: Sihua Zhou
> Assignee: Sihua Zhou
> Priority: Critical
> Fix For: 1.5.0
>
>
> Currently, almost every time we want to iterator a RocksDBMapState we need to
> do seek at least 2 times (Seek is a poor performance action for rocksdb cause
> it can't use the bloomfilter). This is because `RocksDBMapIterator` use a
> `cacheEntries` to cache the seek values every time and the `cacheEntries`'s
> init size is 1.
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