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https://issues.apache.org/jira/browse/HBASE-2026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785189#action_12785189
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stack commented on HBASE-2026:
------------------------------
Here is updateReaders with line numbers from 0.20:
{code}
232 // Implementation of ChangedReadersObserver
233 public synchronized void updateReaders() throws IOException {
234 if (this.closing.get()) return;
235 KeyValue topKey = this.peek();
236 if (topKey == null) return;
237 List<KeyValueScanner> scanners = getScanners();
238
239 // Seek all scanners to the initial key
240 for(KeyValueScanner scanner : scanners) {
241 scanner.seek(topKey);
242 }
243
244 // Combine all seeked scanners with a heap
245 heap = new KeyValueHeap(
246 scanners.toArray(new KeyValueScanner[scanners.size()]),
store.comparator);
247
248 // Reset the state of the Query Matcher and set to top row
249 matcher.reset();
250 matcher.setRow(heap.peek().getRow());
251 }
{code}
heap.peek is returning null?
> NPE in StoreScanner on compaction
> ---------------------------------
>
> Key: HBASE-2026
> URL: https://issues.apache.org/jira/browse/HBASE-2026
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.2
> Reporter: Jean-Daniel Cryans
> Fix For: 0.20.3, 0.21.0
>
>
> From Zhenyu:
> {code}
> 2009-12-01 00:35:05,321 INFO org.apache.hadoop.hbase.regionserver.HRegion:
> Starting compaction on region ip_info_238,41.214.148.221,1259132082707
> 2009-12-01 00:35:05,572 WARN org.apache.hadoop.hbase.regionserver.Store: Not
> in setorg.apache.hadoop.hbase.regionserver.storescan...@7f821a6c
> 2009-12-01 00:35:05,572 WARN org.apache.hadoop.hbase.regionserver.Store: Not
> in setorg.apache.hadoop.hbase.regionserver.storescan...@7f821a6c
> 2009-12-01 00:35:05,572 ERROR
> org.apache.hadoop.hbase.regionserver.CompactSplitThread: Compaction failed
> for region ip_info_238,41.214.148.221,1259132082707
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.updateReaders(StoreScanner.java:250)
> at
> org.apache.hadoop.hbase.regionserver.Store.notifyChangedReadersObservers(Store.java:628)
> ...
> {code}
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