manojpec commented on a change in pull request #3977:
URL: https://github.com/apache/hudi/pull/3977#discussion_r749886365
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File path:
hudi-common/src/main/java/org/apache/hudi/common/table/log/AbstractHoodieLogRecordReader.java
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@@ -374,21 +374,23 @@ private void
processQueuedBlocksForInstant(Deque<HoodieLogBlock> logBlocks, int
LOG.info("Number of remaining logblocks to merge " + logBlocks.size());
// poll the element at the bottom of the stack since that's the order it
was inserted
HoodieLogBlock lastBlock = logBlocks.pollLast();
- switch (lastBlock.getBlockType()) {
- case AVRO_DATA_BLOCK:
- processDataBlock((HoodieAvroDataBlock) lastBlock, keys);
- break;
- case HFILE_DATA_BLOCK:
- processDataBlock((HoodieHFileDataBlock) lastBlock, keys);
- break;
- case DELETE_BLOCK:
- Arrays.stream(((HoodieDeleteBlock)
lastBlock).getKeysToDelete()).forEach(this::processNextDeletedKey);
- break;
- case CORRUPT_BLOCK:
- LOG.warn("Found a corrupt block which was not rolled back");
- break;
- default:
- break;
+ if (lastBlock != null) {
Review comment:
During EMR/S3 testing, I encountered NPE in this block. Looking more
into it, ArrayDeque is not thread safe (though my test wasn't doing any multi
writer tests) and `isEmpty()` check is not fool proof. That is, it can say it
is not empty and still have poll() returning null. Haven't got a chance to dig
how this case is getting exposed in my test case, but for now closing the gap
and avoiding the crash by doing an additional check.
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