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https://issues.apache.org/jira/browse/FLINK-7424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek closed FLINK-7424.
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Resolution: Not A Problem
This is working as intended, but badly documented. Please reopen if you
disagree.
> `CEP` component make `KeyedStream` choose wrong channel
> -------------------------------------------------------
>
> Key: FLINK-7424
> URL: https://issues.apache.org/jira/browse/FLINK-7424
> Project: Flink
> Issue Type: Bug
> Components: CEP, Streaming
> Reporter: Benedict Jin
> Assignee: Benedict Jin
>
> `CEP` component make `KeyedStream` choose wrong channel
> Origin KeySelector is perfect right.
> {code:java}
> public static KeySelector<HBaseServerLog, Integer> buildKeySelector() {
> return (KeySelector<HBaseServerLog, Integer>) log -> {
> if (log == null) return 0;
> Integer flumeId;
> if ((flumeId = log.getFlumeId()) == null) return 1;
> return flumeId;
> };
> }
> {code}
> After some changes, it will throw Key group index out of range of key group
> range [16, 32) exception.
> {code}
> public static KeySelector<HBaseServerLog, Integer> buildKeySelector(final int
> parallelism) {
> return new KeySelector<HBaseServerLog, Integer>() {
> private Random r = new Random(System.nanoTime());
> @Override
> public Integer getKey(HBaseServerLog log) throws Exception {
> if (log == null) return 0;
> Integer flumeId;
> if ((flumeId = log.getFlumeId()) == null) return 1;
> return Math.max(flumeId + (r.nextBoolean() ? 0 : -1 *
> r.nextInt(parallelism)), 0);
> }
> };
> }
> {code}
> But, after MathUtils.murmurHash(keyHash) % maxParallelism process, it
> shouldn't be wrong. Actually, when we add some `CEP` component
> (IterativeCondition/PatternFlatSelectFunction) code after it. It make the
> KeySelector choose wrong channel and throw IllegalArgumentException.
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