ZanderXu created HDFS-16622:
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Summary: addRDBI in IncrementalBlockReportManager may remove the
block with bigger GS.
Key: HDFS-16622
URL: https://issues.apache.org/jira/browse/HDFS-16622
Project: Hadoop HDFS
Issue Type: Bug
Reporter: ZanderXu
Assignee: ZanderXu
In our production environment, there is a strange missing block, according to
the log, I suspect there is a bug in function addRDBI(ReceivedDeletedBlockInfo
rdbi,DatanodeStorage storage)(line 250).
Bug code in the for loop:
{code:java}
synchronized void addRDBI(ReceivedDeletedBlockInfo rdbi,
DatanodeStorage storage) {
// Make sure another entry for the same block is first removed.
// There may only be one such entry.
for (PerStorageIBR perStorage : pendingIBRs.values()) {
if (perStorage.remove(rdbi.getBlock()) != null) {
break;
}
}
getPerStorageIBR(storage).put(rdbi);
}
{code}
Removed the GS of the Block in ReceivedDeletedBlockInfo may be greater than the
GS of the Block in rdbi. And NN will invalidate the Replicate will small GS
when complete one block.
So If there is only one replicate for one block, there is a possibility of
missingblock because of this wrong logic.
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