[jira] [Created] (KAFKA-6186) RocksDB based WindowStore fail to create db file on Windows OS

["James Wu (JIRA)" <ji...@apache.org>]

James Wu created KAFKA-6186:
-------------------------------

             Summary: RocksDB based WindowStore fail to create db file on Windows OS
                 Key: KAFKA-6186
                 URL: https://issues.apache.org/jira/browse/KAFKA-6186
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 1.0.0
         Environment: Windows OS
            Reporter: James Wu


Code snippet just like below

...
        textLines.flatMapValues(value -> Arrays.asList(pattern.split(value.toLowerCase()))).groupBy((key, word) -> word)
                .windowedBy(TimeWindows.of(10000)).count(Materialized.as("Counts"));
...

Run it on Windows, then the exception is throw as below

Caused by: org.rocksdb.RocksDBException: Failed to create dir: F:\tmp\kafka-streams\wordcount-lambda-example\1_0\Counts\Counts:1510099200000: Invalid argument
	at org.rocksdb.RocksDB.open(Native Method) ~[rocksdbjni-5.7.3.jar:na]
	at org.rocksdb.RocksDB.open(RocksDB.java:231) ~[rocksdbjni-5.7.3.jar:na]
	at org.apache.kafka.streams.state.internals.RocksDBStore.openDB(RocksDBStore.java:197) ~[kafka-streams-1.0.0.jar:na]
	... 29 common frames omitted

Checked the code, I found the issue is caused by line 72 in org.apache.kafka.streams.state.internals.Segments

    String segmentName(final long segmentId) {
        // previous format used - as a separator so if this changes in the future
        // then we should use something different.
        return name + ":" + segmentId * segmentInterval;
    }

"segmentName" is passed to RocksDB, RockDB will use it as file name to create the DB file, as we known, the ":" cannot be part of file name in Windows OS.



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