Apache Hive
▻https://hownot2code.com/2019/08/15/null-pointer-exception
Null Pointer Exception V6008 Potential null dereference of ‘dagLock’. QueryTracker.java(557), QueryTracker.java(553) private void handleFragmentCompleteExternalQuery(QueryInfo queryInfo) if (queryInfo.isExternalQuery()) ReadWriteLock dagLock = getDagLock(queryInfo.getQueryIdentifier()); if (dagLock == null) LOG.warn("Ignoring fragment completion for unknown query: ", queryInfo.getQueryIdentifier()); boolean locked = dagLock.writeLock().tryLock(); ..... A null object is caught, logged, and… the program just keeps … Continue reading Apache Hive
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