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Date: Tue, 17 Jul 2012 23:20:35 +0000 (UTC)
From: "Jean-Daniel Cryans (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <402554022.66716.1342567235763.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Created] (HBASE-6416) hbck dies on NPE when a region folder
 exists but the table does not
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Jean-Daniel Cryans created HBASE-6416:
-----------------------------------------

             Summary: hbck dies on NPE when a region folder exists but the table does not
                 Key: HBASE-6416
                 URL: https://issues.apache.org/jira/browse/HBASE-6416
             Project: HBase
          Issue Type: Bug
            Reporter: Jean-Daniel Cryans
             Fix For: 0.96.0, 0.94.2


This is what I'm getting for leftover data that has no .regioninfo

First:

{quote}
12/07/17 23:13:37 WARN util.HBaseFsck: Failed to read .regioninfo file for region null
java.io.FileNotFoundException: File does not exist: /hbase/stumble_info_urlid_user/bd5f6cfed674389b4d7b8c1be227cb46/.regioninfo
	at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1822)
	at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java:1813)
	at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:544)
	at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:187)
	at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:456)
	at org.apache.hadoop.hbase.util.HBaseFsck.loadHdfsRegioninfo(HBaseFsck.java:611)
	at org.apache.hadoop.hbase.util.HBaseFsck.access$2200(HBaseFsck.java:140)
	at org.apache.hadoop.hbase.util.HBaseFsck$WorkItemHdfsRegionInfo.call(HBaseFsck.java:2882)
	at org.apache.hadoop.hbase.util.HBaseFsck$WorkItemHdfsRegionInfo.call(HBaseFsck.java:2866)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
{quote}

Then it hangs on:

{quote}
12/07/17 23:13:39 INFO util.HBaseFsck: Attempting to handle orphan hdfs dir: hdfs://sfor3s24:10101/hbase/stumble_info_urlid_user/bd5f6cfed674389b4d7b8c1be227cb46
12/07/17 23:13:39 INFO util.HBaseFsck: checking orphan for table null
Exception in thread "main" java.lang.NullPointerException
	at org.apache.hadoop.hbase.util.HBaseFsck$TableInfo.access$100(HBaseFsck.java:1634)
	at org.apache.hadoop.hbase.util.HBaseFsck.adoptHdfsOrphan(HBaseFsck.java:435)
	at org.apache.hadoop.hbase.util.HBaseFsck.adoptHdfsOrphans(HBaseFsck.java:408)
	at org.apache.hadoop.hbase.util.HBaseFsck.restoreHdfsIntegrity(HBaseFsck.java:529)
	at org.apache.hadoop.hbase.util.HBaseFsck.offlineHdfsIntegrityRepair(HBaseFsck.java:313)
	at org.apache.hadoop.hbase.util.HBaseFsck.onlineHbck(HBaseFsck.java:386)
	at org.apache.hadoop.hbase.util.HBaseFsck.main(HBaseFsck.java:3227)
{quote}

The NPE is sent by:

{code}
Preconditions.checkNotNull("Table " + tableName + "' not present!", tableInfo);
{code}

I wonder why the condition checking was added if we don't handle it... In any case hbck dies but it hangs because there are some non-daemon hanging around.

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