Jean-Daniel Cryans created HBASE-9307:
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Summary: HalfStoreFileReader needs to handle the faked key else
compactions go into infinite loops
Key: HBASE-9307
URL: https://issues.apache.org/jira/browse/HBASE-9307
Project: HBase
Issue Type: Bug
Affects Versions: 0.95.2
Reporter: Jean-Daniel Cryans
Assignee: Jean-Daniel Cryans
Priority: Critical
Fix For: 0.98.0, 0.95.3
I found this while trying out 0.95.2
I couldn't shut my cluster down because one region was still compacting, but it
already had been doing that for an hour and it only had 80MBs of data.
Debugging I saw that it was a post-split compaction, specifically for the top
part of the HFiles, and that it was just spinning on the first entry in the
file.
Eventually I saw that the anonymous HFileScanner inside
HalfStoreFileReader.getScanner (that's so dirty) wasn't handling
HConstants.INDEX_KEY_MAGIC in seekTo() when calling this:
bq. this.delegate.seekTo(splitkey)
Instead it would treat this as if the split key wasn't in the file, but still
seek back to the beginning of the file *then read on from there*.
During the compaction it would see a KV that's not even part of the region, and
it just tries to find the correct block over and over again.
This came from HBASE-7845.
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