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https://issues.apache.org/jira/browse/HBASE-16132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15367020#comment-15367020
]
Hudson commented on HBASE-16132:
--------------------------------
SUCCESS: Integrated in HBase-1.1-JDK7 #1741 (See
[https://builds.apache.org/job/HBase-1.1-JDK7/1741/])
HBASE-16132 Scan does not return all the result when regionserver is (liyu: rev
dcc1243f61332b696e1df193d553249b469c0e63)
*
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMasterCommandLine.java
> Scan does not return all the result when regionserver is busy
> -------------------------------------------------------------
>
> Key: HBASE-16132
> URL: https://issues.apache.org/jira/browse/HBASE-16132
> Project: HBase
> Issue Type: Bug
> Reporter: binlijin
> Assignee: binlijin
> Fix For: 2.0.0, 1.3.0, 1.2.2, 1.1.6
>
> Attachments: HBASE-16132.patch, HBASE-16132_v2.patch,
> HBASE-16132_v3.patch, HBASE-16132_v3.patch, TestScanMissingData.java
>
>
> We have find some corner case, when regionserver is busy and last a long
> time. Some scanner may return null even if they do not scan all data.
> We find in ScannerCallableWithReplicas there is a case do not handler
> correct, when cs.poll timeout and do not return any result , it is will
> return a null result, so scan get null result, and end the scan.
> {code}
> try {
> Future<Pair<Result[], ScannerCallable>> f = cs.poll(timeout,
> TimeUnit.MILLISECONDS);
> if (f != null) {
> Pair<Result[], ScannerCallable> r = f.get(timeout,
> TimeUnit.MILLISECONDS);
> if (r != null && r.getSecond() != null) {
> updateCurrentlyServingReplica(r.getSecond(), r.getFirst(), done,
> pool);
> }
> return r == null ? null : r.getFirst(); // great we got an answer
> }
> } catch (ExecutionException e) {
> RpcRetryingCallerWithReadReplicas.throwEnrichedException(e, retries);
> } catch (CancellationException e) {
> throw new InterruptedIOException(e.getMessage());
> } catch (InterruptedException e) {
> throw new InterruptedIOException(e.getMessage());
> } catch (TimeoutException e) {
> throw new InterruptedIOException(e.getMessage());
> } finally {
> // We get there because we were interrupted or because one or more of
> the
> // calls succeeded or failed. In all case, we stop all our tasks.
> cs.cancelAll();
> }
> return null; // unreachable
> {code}
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