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https://issues.apache.org/jira/browse/HBASE-11813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108251#comment-14108251
]
Qiang Tian commented on HBASE-11813:
------------------------------------
I'd suspect this one:
{code}
/**
* Flatten the map of cells out under the CellScanner
* @param map Map of Cell Lists; for example, the map of families to Cells
that is used
* inside Put, etc., keeping Cells organized by family.
* @return CellScanner interface over <code>cellIterable</code>
*/
public static CellScanner createCellScanner(final NavigableMap<byte [],
List<Cell>> map) {
return new CellScanner() {
private final Iterator<Entry<byte[], List<Cell>>> entries =
map.entrySet().iterator();
private Iterator<Cell> currentIterator = null;
private Cell currentCell;
@Override
public Cell current() {
return this.currentCell;
}
@Override
public boolean advance() {
if (this.currentIterator == null) {
if (!this.entries.hasNext()) return false;
this.currentIterator = this.entries.next().getValue().iterator();
}
if (this.currentIterator.hasNext()) {
this.currentCell = this.currentIterator.next();
return true;
}
this.currentCell = null;
this.currentIterator = null;
return advance();
}
};
}
{code}
looks the one Andrew mentioned would not trigger advance method in server
side...while the other one is widely used in server side code
paths..coprocessor or end point related..
> CellScanner#advance may infinitely recurse
> ------------------------------------------
>
> Key: HBASE-11813
> URL: https://issues.apache.org/jira/browse/HBASE-11813
> Project: HBase
> Issue Type: Bug
> Reporter: Andrew Purtell
> Priority: Blocker
> Fix For: 0.99.0, 2.0.0, 0.98.6
>
>
> On user@hbase, [email protected] reported:
> {quote}
> we face a serious issue with our HBase production cluster for two days now.
> Every couple minutes, a random RegionServer gets stuck and does not process
> any requests. In addition this causes the other RegionServers to freeze
> within a minute which brings down the entire cluster. Stopping the affected
> RegionServer unblocks the cluster and everything comes back to normal.
> {quote}
> Subsequent troubleshooting reveals that RPC is getting stuck because we are
> losing RPC handlers. In the .out files we have this:
> {noformat}
> Exception in thread "defaultRpcServer.handler=5,queue=2,port=60020"
> java.lang.StackOverflowError
> at org.apache.hadoop.hbase.CellUtil$1.advance(CellUtil.java:210)
> at org.apache.hadoop.hbase.CellUtil$1.advance(CellUtil.java:210)
> at org.apache.hadoop.hbase.CellUtil$1.advance(CellUtil.java:210)
> at org.apache.hadoop.hbase.CellUtil$1.advance(CellUtil.java:210)
> [...]
> Exception in thread "defaultRpcServer.handler=5,queue=2,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=18,queue=0,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=23,queue=2,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=24,queue=0,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=2,queue=2,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=11,queue=2,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=25,queue=1,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=20,queue=2,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=19,queue=1,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=15,queue=0,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=1,queue=1,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=7,queue=1,port=60020"
> java.lang.StackOverflowError
> Exception in thread "defaultRpcServer.handler=4,queue=1,port=60020"
> java.lang.StackOverflowError​
> {noformat}
> That is the anonymous CellScanner instance we create from
> CellUtil#createCellScanner:
> {code}
> ​ return new CellScanner() {
> private final Iterator<? extends CellScannable> iterator =
> cellScannerables.iterator();
> private CellScanner cellScanner = null;
> @Override
> public Cell current() {
> return this.cellScanner != null? this.cellScanner.current(): null;
> }
> @Override
> public boolean advance() throws IOException {
> if (this.cellScanner == null) {
> if (!this.iterator.hasNext()) return false;
> this.cellScanner = this.iterator.next().cellScanner();
> }
> if (this.cellScanner.advance()) return true;
> this.cellScanner = null;
> ---> return advance();
> }
> };
> {code}
> That final return statement is the immediate problem.
> We should also fix this so the RegionServer aborts if it loses a handler to
> an Error.
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