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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-12319) Inconsistencies during region recovery due to close/open of a region during recovery
Date Wed, 22 Oct 2014 07:21:35 GMT
Devaraj Das created HBASE-12319:
-----------------------------------

             Summary: Inconsistencies during region recovery due to close/open of a region
during recovery
                 Key: HBASE-12319
                 URL: https://issues.apache.org/jira/browse/HBASE-12319
             Project: HBase
          Issue Type: Bug
            Reporter: Devaraj Das


In one of my test runs, I saw the following:
{noformat}
2014-10-14 13:45:30,782 DEBUG [StoreOpener-51af4bd23dc32a940ad2dd5435f00e1d-1] regionserver.HStore:
loaded hdfs://hor9n01.gq1.ygridcore.net:8020/apps/hbase/data/data/default/IntegrationTestIngest/51af4bd23dc32a940ad2dd5435f00e1d/test_cf/d6df5cfe15ca41d68c619489fbde4d04,
isReference=false, isBulkLoadResult=false, seqid=141197, majorCompaction=true
2014-10-14 13:45:30,788 DEBUG [RS_OPEN_REGION-hor9n01:60020-1] regionserver.HRegion: Found
3 recovered edits file(s) under hdfs://hor9n01.gq1.ygridcore.net:8020/apps/hbase/data/data/default/IntegrationTestIngest/51af4bd23dc32a940ad2dd5435f00e1d
.............
.............
2014-10-14 13:45:31,916 WARN  [RS_OPEN_REGION-hor9n01:60020-1] regionserver.HRegion: Null
or non-existent edits file: hdfs://hor9n01.gq1.ygridcore.net:8020/apps/hbase/data/data/default/IntegrationTestIngest/51af4bd23dc32a940ad2dd5435f00e1d/recovered.edits/0000000000000198080
{noformat}

The above logs is from a regionserver, say RS2. From the initial analysis it seemed like the
master asked a certain regionserver to open the region (let's say RS1) and for some reason
asked it to close soon after. The open was still proceeding on RS1 but the master reassigned
the region to RS2. This also started the recovery but it ended up seeing an inconsistent view
of the recovered-edits files (it reports missing files as per the logs above) since the first
regionserver (RS1) deleted some files after it completed the recovery. When RS2 really opens
the region, it might not see the recent data that was written by flushes on hor9n10 during
the recovery process. Reads of that data would have inconsistencies.



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