apache / bookkeeper / 365 / 1
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coverage: 72.338% (-0.07%) from 72.407%
365.1

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jenkins

Enrico Olivelli 
[BK-GC] Fix GC thread gets blocked

### Motivation

It addresses below thread-stuck while performing gc in bookie.

```
Thread 3363: (state = BLOCKED)
 - java.lang.Object.wait(long) bci=0 (Compiled frame; information may be imprecise)
 - java.lang.Object.wait() bci=2, line=502 (Compiled frame)
 - org.apache.bookkeeper.util.ZkUtils.getChildrenInSingleNode(org.apache.zookeeper.ZooKeeper, java.lang.String) bci=34, line=243 (Compiled frame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator.getChildrenAt(java.lang.String) bci=8, line=165 (Compiled fr
ame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator$LeafIterator.<init>(org.apache.bookkeeper.meta.LongHierarchic
alLedgerManager$LongHierarchicalLedgerRangeIterator, java.lang.String) bci=11, line=187 (Compiled frame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator$InnerIterator.advance() bci=137, line=261 (Compiled frame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator$InnerIterator.next() bci=28, line=281 (Compiled frame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator$InnerIterator.next() bci=4, line=278 (Compiled frame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator$InnerIterator.next() bci=4, line=278 (Compiled frame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator$InnerIterator.next() bci=4, line=278 (Compiled frame)
 - org.apache.bookkeeper.meta.LongHierarchicalLedgerManager$LongHierarchicalLedgerRangeIterator.next() bci=8, line=304 (Compiled frame)
 - org.apache.bookkeeper.meta.HierarchicalLedgerManager$HierarchicalLedgerRangeIterator.next() bci=26, line=117 (Compiled frame)
 - org.apache.bookkeeper.bookie.ScanAndCompareGarbageCollector.gc(org.apache.b... (continued)

26449 of 36563 relevant lines covered (72.34%)

0.72 hits per line

Source Files on job 365.1