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From "Aditya Kishore (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9737) Resource leak if a corrupt HFile presents itself in a region leading to Region Server OOM
Date Wed, 09 Oct 2013 21:54:43 GMT
Aditya Kishore created HBASE-9737:
-------------------------------------

             Summary: Resource leak if a corrupt HFile presents itself in a region leading
to Region Server OOM
                 Key: HBASE-9737
                 URL: https://issues.apache.org/jira/browse/HBASE-9737
             Project: HBase
          Issue Type: Bug
          Components: HFile
    Affects Versions: 0.94.12
            Reporter: Aditya Kishore
            Assignee: Aditya Kishore
            Priority: Critical


One of our customer was recently hit with OOM error on almost all of the region servers.

Postmortem of the issue reveled that a corrupt HFile had made its way into one of the regions
which resulted into the region brought offline immediately which is as per design.

What happened next reveals two issues:\\
\\
* As soon as the region was offlined, Master noticed this and tried to assign the region to
another region server which of course failed (again due to the corrupt HFile) and then Master
tried to assign this to another and so on. So this region kept bouncing from one server to
another and this went unnoticed for few hours and all region servers log were filled with
thousands of this message:{noformat}org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler:
Failed open of
region=userdata,50743646010,1378139055806.318c533716869574f10615703269497f.,
starting to roll back the global memstore size.
java.io.IOException: java.io.IOException:
org.apache.hadoop.hbase.io.hfile.CorruptHFileException: Problem reading HFile
Trailer from file
/hbase/userdata/318c533716869574f10615703269497f/data/a3e2ae39f71441ac92a6563479fb976e
        at org.apache.hadoop.hbase.regionserver.HRegion.initializeRegionInternals(HRegion.java:550)
        at org.apache.hadoop.hbase.regionserver.HRegion.initialize(HRegion.java:463)
        at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3835)
        at org.apache.hadoop.hbase.regionserver.HRegion.openHRegion(HRegion.java:3783)
        at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.openRegion(OpenRegionHandler.java:332)
        at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:108)
        at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169)
        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)
Caused by: java.io.IOException:
org.apache.hadoop.hbase.io.hfile.CorruptHFileException: Problem reading HFile
Trailer from file
/hbase/userdata/318c533716869574f10615703269497f/data/a3e2ae39f71441ac92a6563479fb976e
        at org.apache.hadoop.hbase.regionserver.Store.loadStoreFiles(Store.java:404)
        at org.apache.hadoop.hbase.regionserver.Store.<init>(Store.java:257)
        at org.apache.hadoop.hbase.regionserver.HRegion.instantiateHStore(HRegion.java:3017)
        at org.apache.hadoop.hbase.regionserver.HRegion$1.call(HRegion.java:525)
        at org.apache.hadoop.hbase.regionserver.HRegion$1.call(HRegion.java:523)
        at java.util.concurrent.FutureTask$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)
{noformat} For situation like this, the region should be marked "offlined_with_error" or something
similar so that Master does not try to assign it to another server without user fixing the
issue. I will create a separate JIRA for that.

* The second problem and the scope of this JIRA is that the function {{org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion()}}
throws exception without closing the {{FSDataInputStream}} objects even if closeIStream is
set to true. This lead to orphan filesystem streams accumulating in region server and it eventually
died of OOM.



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