[jira] [Created] (HBASE-26267) Master initialization fails if Master Region WAL dir is missing

["Josh Elser (Jira)" <ji...@apache.org>]

Josh Elser created HBASE-26267:
----------------------------------

             Summary: Master initialization fails if Master Region WAL dir is missing
                 Key: HBASE-26267
                 URL: https://issues.apache.org/jira/browse/HBASE-26267
             Project: HBase
          Issue Type: Improvement
          Components: master
    Affects Versions: 2.4.6
            Reporter: Josh Elser
            Assignee: Josh Elser
             Fix For: 2.5.0, 3.0.0-alpha-2, 2.4.7


From a recent branch-2.4 build:

{noformat}
2021-09-07 19:31:19,666 ERROR [master/localhost:16000:becomeActiveMaster] master.HMaster(159): ***** ABORTING master localhost,16000,1631057476442: Unhandled exception. Starting shutdown. *****
java.io.FileNotFoundException: File hdfs://localhost:8020/hbase-2.4-wals/MasterData/WALs does not exist.
        at org.apache.hadoop.hdfs.DistributedFileSystem.listStatusInternal(DistributedFileSystem.java:1059)
        at org.apache.hadoop.hdfs.DistributedFileSystem.access$1000(DistributedFileSystem.java:131)
        at org.apache.hadoop.hdfs.DistributedFileSystem$24.doCall(DistributedFileSystem.java:1119)
        at org.apache.hadoop.hdfs.DistributedFileSystem$24.doCall(DistributedFileSystem.java:1116)
        at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
        at org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:1126)
        at org.apache.hadoop.hbase.master.region.MasterRegion.open(MasterRegion.java:226)
        at org.apache.hadoop.hbase.master.region.MasterRegion.create(MasterRegion.java:303)
        at org.apache.hadoop.hbase.master.region.MasterRegionFactory.create(MasterRegionFactory.java:104)
        at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:839)
        at org.apache.hadoop.hbase.master.HMaster.startActiveMasterManager(HMaster.java:2189)
        at org.apache.hadoop.hbase.master.HMaster.lambda$run$0(HMaster.java:512)
        at java.lang.Thread.run(Thread.java:748)
{noformat}

If the WAL directory is missing but the Master Region already exists, we will try to list the contents of the Master Region's WAL directory which may or may not exist. If we simply check to make sure the directory exists and then the rest of the initialization code works as expected.



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