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From "Johannes Schaback (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11813) CellScanner#advance may infinitely recurse
Date Sun, 24 Aug 2014 10:15:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108391#comment-14108391
] 

Johannes Schaback commented on HBASE-11813:
-------------------------------------------

Ah, nevermind. I believe I just have to apply the patched attached to this bug ticket.

> 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
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 0.99.0, 2.0.0, 0.98.6
>
>         Attachments: 11813.098.txt, 11813.098.txt, 11813.master.txt
>
>
> On user@hbase, johannes.schaback@visual-meta.com 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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