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https://issues.apache.org/jira/browse/HBASE-5922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268132#comment-13268132
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Todd Johnson commented on HBASE-5922:
-------------------------------------
"This seems correct to me... that we should be returning last key in the bottom
(the 'before') rather than a null."
I guess this requires a little more testing. My understanding has been that,
when 'bottom' is being asked about something that is really in 'top,' there is
nothing present (in 'bottom') which could qualify as 'before,' so to move the
pointer anywhere would be a waste.
If the correct thing to do is end up with a call to
delegate.seekBefore(splitKey ...), I don't think the best fix is to change >=
to >. I agree that this would have that result, but it creates a single
unnecessary (and somewhat confusing) recursive call that is guaranteed to
result in delegate.seekBefore(splitKey ...) anyway. So the solution which has
the behavior that Adoop expects but is most readable would change the recursive
call on line 153 from seekBefore to delegate.seekBefore. This would also make
it look more like the analogous code in seekTo().
But I would still prefer to spend a few more minutes with Nate and the code
tomorrow.
> HalfStoreFileReader seekBefore causes StackOverflowError
> --------------------------------------------------------
>
> Key: HBASE-5922
> URL: https://issues.apache.org/jira/browse/HBASE-5922
> Project: HBase
> Issue Type: Bug
> Components: client, io
> Affects Versions: 0.90.0
> Environment: HBase 0.90.4
> Reporter: Nate Putnam
> Assignee: Nate Putnam
> Priority: Critical
> Fix For: 0.90.0
>
> Attachments: HBASE-5922.patch, HBASE-5922.patch, HBASE-5922.v2.patch
>
>
> Calling HRegionServer.getClosestRowBefore() can cause a stack overflow if the
> underlying store file is a reference and the row key is in the bottom.
> java.io.IOException: java.io.IOException: java.lang.StackOverflowError
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:990)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.convertThrowableToIOE(HRegionServer.java:978)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getClosestRowBefore(HRegionServer.java:1651)
> at sun.reflect.GeneratedMethodAccessor174.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:570)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1039)
> Caused by: java.lang.StackOverflowError
> at
> org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekBefore(HalfStoreFileReader.java:147)
> at
> org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekBefore(HalfStoreFileReader.java:149)
> at
> org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekBefore(HalfStoreFileReader.java:149)
> at
> org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekBefore(HalfStoreFileReader.java:149)
> at
> org.apache.hadoop.hbase.io.HalfStoreFileReader$1.seekBefore(HalfStoreFileReader.java:149)
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