There's a bug in GridCacheWriteBehindStore in the flusher method. https://github.com/apache/ignite/blob/master/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/store/GridCacheWriteBehindStore.java#L674
The logic states there that if flush thread count is not a power of 2, then perform some math that is not guaranteed to return a positive number. For example, if you pass this string as a key it returns a negative number: accb2e8ea33e4a89b4189463cacc3c4e and then throws an array out of bounds exception when looking up the thread. I'm surprised this bug has been there so long, I guess people are not setting their thread counts to non-powers-of-2. -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
