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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16807) RegionServer will fail to report new active Hmaster until HMaster/RegionServer failover
Date Fri, 14 Oct 2016 12:54:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575250#comment-15575250
] 

Hudson commented on HBASE-16807:
--------------------------------

FAILURE: Integrated in Jenkins build HBase-0.98-matrix #410 (See [https://builds.apache.org/job/HBase-0.98-matrix/410/])
HBASE-16807, RegionServer will fail to report new active Hmaster until (chenheng: rev 09b89eedb585517d734bf3af3875e0e1ff5359e0)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerReportForDuty.java


> RegionServer will fail to report new active Hmaster until HMaster/RegionServer failover
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-16807
>                 URL: https://issues.apache.org/jira/browse/HBASE-16807
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Pankaj Kumar
>            Assignee: Pankaj Kumar
>             Fix For: 2.0.0, 1.4.0, 1.3.1, 1.2.5, 0.98.24, 1.1.8
>
>         Attachments: HBASE-16807-0.98.patch, HBASE-16807-branch-1.1.patch, HBASE-16807-branch-1.2.patch,
HBASE-16807-branch-1.3.patch, HBASE-16807-branch-1.patch, HBASE-16807.patch
>
>
> It's little weird, but it happened in the product environment that few RegionServer missed
master znode create notification on master failover. In that case ZooKeeperNodeTracker will
not refresh the cached data and MasterAddressTracker will always return old active HM detail
to Region server on ServiceException.
> Though We create region server stub on failure but without refreshing the MasterAddressTracker
data.
> In HRegionServer.createRegionServerStatusStub()
> {code}
>   boolean refresh = false; // for the first time, use cached data
>     RegionServerStatusService.BlockingInterface intf = null;
>     boolean interrupted = false;
>     try {
>       while (keepLooping()) {
>         sn = this.masterAddressTracker.getMasterAddress(refresh);
>         if (sn == null) {
>           if (!keepLooping()) {
>             // give up with no connection.
>             LOG.debug("No master found and cluster is stopped; bailing out");
>             return null;
>           }
>           if (System.currentTimeMillis() > (previousLogTime + 1000)) {
>             LOG.debug("No master found; retry");
>             previousLogTime = System.currentTimeMillis();
>           }
>           refresh = true; // let's try pull it from ZK directly
>           if (sleep(200)) {
>             interrupted = true;
>           }
>           continue;
>         }
> {code}
> Here we refresh node only when 'sn' is NULL otherwise it will use same cached data. 
> So in above case RegionServer will never report active HMaster successfully until HMaster
failover or RegionServer restart.



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