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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17187) DoNotRetryExceptions from coprocessors should bubble up to the application
Date Thu, 01 Dec 2016 05:28:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15710950#comment-15710950

Anoop Sam John commented on HBASE-17187:

See RegionScannerImpl#next
if (this.filterClosed) {
        throw new UnknownScannerException("Scanner was closed (timed out?) " +
            "after we renewed it. Could be caused by a very slow scanner " +
            "or a lengthy garbage collection");
So here we throw UnknownScannerException and RsRpcServices catch IOE and the new code is having
a DNRIOE check and now we will throw back UnknownScannerException  not ScannerResetException.
 I think that is ok.  Or not?
Another place is this
public boolean nextRaw(List<Cell> outResults, ScannerContext scannerContext)
        throws IOException {
      if (storeHeap == null) {
        // scanner is closed
        throw new UnknownScannerException("Scanner was closed");

Just trying to understand the impact of the change fully. Tks.

> DoNotRetryExceptions from coprocessors should bubble up to the application
> --------------------------------------------------------------------------
>                 Key: HBASE-17187
>                 URL: https://issues.apache.org/jira/browse/HBASE-17187
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>         Attachments: hbase-17187_v1.patch
> In HBASE-16604, we fixed a case where scanner retries was causing the scan to miss some
data in case the scanner is left with a dirty state (like a half-seeked KVHeap). 
> The patch introduced a minor compatibility issue, because now if a coprocessor throws
DNRIOE, we still retry the ClientScanner indefinitely. 
> The test {{ServerExceptionIT}} in Phoenix is failing because of this with HBASE-16604.

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