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https://issues.apache.org/jira/browse/HIVE-24297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ádám Szita reassigned HIVE-24297:
---------------------------------
> LLAP buffer collision causes NPE
> --------------------------------
>
> Key: HIVE-24297
> URL: https://issues.apache.org/jira/browse/HIVE-24297
> Project: Hive
> Issue Type: Bug
> Reporter: Ádám Szita
> Assignee: Ádám Szita
> Priority: Major
>
> HIVE-23741 introduced an optimization so that CacheTags are not stored on
> buffer level, but rather on file level, as one cache tag can only relate to
> one file. With this change a buffer->filecache reference was introduced so
> that the buffer's tag can be calculated with an extra indirection i.e.
> buffer.filecache.tag.
> However during buffer collision in putFileData method, we don't set the
> filecache reference of the collided (new) buffer:
> [https://github.com/apache/hive/commit/2e18a7408a8dd49beecad8d66bfe054b7dc474da#diff-d2ccd7cf3042845a0812a5e118f82db49253d82fc86449ffa408903bf434fb6dR309-R311]
> Later this cases NPE when the new (instantly decRef'ed) buffer is evicted:
> {code:java}
> Caused by: java.lang.NullPointerException
> at
> java.util.concurrent.ConcurrentSkipListMap.doGet(ConcurrentSkipListMap.java:778)
> at
> java.util.concurrent.ConcurrentSkipListMap.get(ConcurrentSkipListMap.java:1546)
> at
> org.apache.hadoop.hive.llap.cache.CacheContentsTracker.getTagState(CacheContentsTracker.java:129)
> at
> org.apache.hadoop.hive.llap.cache.CacheContentsTracker.getTagState(CacheContentsTracker.java:125)
> at
> org.apache.hadoop.hive.llap.cache.CacheContentsTracker.reportRemoved(CacheContentsTracker.java:109)
> at
> org.apache.hadoop.hive.llap.cache.CacheContentsTracker.notifyEvicted(CacheContentsTracker.java:238)
> at
> org.apache.hadoop.hive.llap.cache.LowLevelLrfuCachePolicy.evictSomeBlocks(LowLevelLrfuCachePolicy.java:276)
> at
> org.apache.hadoop.hive.llap.cache.CacheContentsTracker.evictSomeBlocks(CacheContentsTracker.java:177)
> at
> org.apache.hadoop.hive.llap.cache.LowLevelCacheMemoryManager.reserveMemory(LowLevelCacheMemoryManager.java:98)
> at
> org.apache.hadoop.hive.llap.cache.LowLevelCacheMemoryManager.reserveMemory(LowLevelCacheMemoryManager.java:65)
> at
> org.apache.hadoop.hive.llap.cache.BuddyAllocator.allocateMultiple(BuddyAllocator.java:323)
> at
> org.apache.hadoop.hive.ql.io.orc.encoded.EncodedReaderImpl.allocateMultiple(EncodedReaderImpl.java:1302)
> at
> org.apache.hadoop.hive.ql.io.orc.encoded.EncodedReaderImpl.readEncodedStream(EncodedReaderImpl.java:930)
> at
> org.apache.hadoop.hive.ql.io.orc.encoded.EncodedReaderImpl.readEncodedColumns(EncodedReaderImpl.java:506)
> ... 16 more {code}
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