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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5813) Retry immediately after a NotServingRegionException in a multiput
Date Wed, 18 Apr 2012 21:34:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256990#comment-13256990
] 

Phabricator commented on HBASE-5813:
------------------------------------

khemani has commented on the revision "[jira] [HBASE-5813] [89-fb] Retry immediately after
a NotServingRegionException in a multiput".

  The ideal behavior will be the following

  look up cached location
  retry:
  make the call
  if the call fails with NSRE
    look up cache for location with reload equal to true
    if you get the same location again then
      wait
      lookup cache for location with reload equal to <not sure what>
      goto retry
    else
      goto retry

  The difference is that you are not making an extra roundtrip to the region server even when
you have discovered that prevAddress is same as newAddress.

REVISION DETAIL
  https://reviews.facebook.net/D2847

BRANCH
  retry_immediately_after_a_HBASE-5813_v17

                
> Retry immediately after a NotServingRegionException in a multiput
> -----------------------------------------------------------------
>
>                 Key: HBASE-5813
>                 URL: https://issues.apache.org/jira/browse/HBASE-5813
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Mikhail Bautin
>            Assignee: Mikhail Bautin
>         Attachments: D2847.1.patch, D2847.10.patch, D2847.11.patch, D2847.2.patch, D2847.3.patch,
D2847.4.patch, D2847.5.patch, D2847.6.patch, D2847.7.patch, D2847.8.patch, D2847.9.patch
>
>
> After we get some errors in a multiput we invalidate the region location cache and wait
for the configured time interval according to the backoff policy. However, if all "errors"
in multiput processing were NotServingRegionExceptions, we don't really need to wait. We can
retry immediately.

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