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https://issues.apache.org/jira/browse/HBASE-15064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15080725#comment-15080725
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ramkrishna.s.vasudevan commented on HBASE-15064:
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Thanks for the valuable information. Good to see HBASE-11425 getting used. One
thing to see is that in case of DBEs (block encoders) there are some small
byte[] created for creating the Cells coming out of DBE blocks though the
actual block is offheap but the value part of the cell gets served directly
from the offheap block.
Pls keep posted on your findings and that would help us refine the feature.
> Possbile Bug in MultiByteBuffer
> -------------------------------
>
> Key: HBASE-15064
> URL: https://issues.apache.org/jira/browse/HBASE-15064
> Project: HBase
> Issue Type: Bug
> Components: io
> Affects Versions: 2.0.0
> Reporter: deepankar
> Priority: Critical
>
> While running the newer patches on our production system, I saw this error
> come couple of times
> {noformat}
> ipc.RpcServer: Unexpected throwable object
> 2016-01-01 16:42:56,090 ERROR
> [B.defaultRpcServer.handler=20,queue=20,port=60020] ipc.RpcServer: Unexpected
> throwable object
> java.nio.BufferUnderflowException
> at java.nio.Buffer.nextGetIndex(Buffer.java:500)
> at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:249)
> at org.apache.hadoop.hbase.nio.MultiByteBuff.get(MultiByteBuff.java:494)
> at
> org.apache.hadoop.hbase.io.encoding.FastDiffDeltaEncoder$1.decode(FastDiffDeltaEncoder.java:402)
>
> at
> org.apache.hadoop.hbase.io.encoding.FastDiffDeltaEncoder$1.decodeNext(FastDiffDeltaEncoder.java:517)
>
> at
> org.apache.hadoop.hbase.io.encoding.BufferedDataBlockEncoder$BufferedEncodedSeeker.next(BufferedDataBlockEncoder.java:815)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.next(StoreFileScanner.java:138)
> {noformat}
> Looking at the get code
> {code}
> if (this.curItem.remaining() == 0) {
> if (items.length - 1 == this.curItemIndex) {
> // means cur item is the last one and we wont be able to read a long.
> Throw exception
> throw new BufferUnderflowException();
> }
> this.curItemIndex++;
> this.curItem = this.items[this.curItemIndex];
> }
> return this.curItem.get();
> {code}
> Can the new currentItem have zero elements (position == limit), does it make
> sense to change the {{if}} to {{while}} ? {{while (this.curItem.remaining()
> == 0)}}. This logic is repeated may make sense abstract to a new function if
> we plan to change to {{if}} to {{while}}
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