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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8055) Potentially missing null check in StoreFile.Reader.getMaxTimestamp()
Date Sat, 09 Mar 2013 00:27:13 GMT
Lars Hofhansl created HBASE-8055:
------------------------------------

             Summary: Potentially missing null check in StoreFile.Reader.getMaxTimestamp()
                 Key: HBASE-8055
                 URL: https://issues.apache.org/jira/browse/HBASE-8055
             Project: HBase
          Issue Type: Bug
            Reporter: Lars Hofhansl
             Fix For: 0.94.7


We just ran into a scenario where we got the following NPE:
{code}
13/03/08 11:52:13 INFO regionserver.Store: Successfully loaded store file file:/tmp/hfile-import-00Dxx0000001lmJ-09Cxx00000000Jm/COLFAM/file09Cxx00000000Jm
into store COLFAM (new location: file:/tmp/localhbase/data/SFDC.ENTITY_HISTORY_ARCHIVE/aeacee43aaf1748c6e60b9cc12bcac3d/COLFAM/120d683414e44478984b50ddd79b6826)
13/03/08 11:52:13 ERROR regionserver.HRegionServer: Failed openScanner
java.lang.NullPointerException
    at org.apache.hadoop.hbase.regionserver.StoreFile$Reader.getMaxTimestamp(StoreFile.java:1702)
    at org.apache.hadoop.hbase.regionserver.StoreFileScanner.requestSeek(StoreFileScanner.java:301)
    at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:127)
    at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:2070)
    at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:3383)
    at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1628)
    at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1620)
    at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1596)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:2342)
    at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)
    at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1400)
13/03/08 11:52:14 ERROR regionserver.HRegionServer: Failed openScanner
{code}

It's not clear, yet, how we got into this situation (we are generating HFiles via HFileOutputFormat
and bulk load those). It seems that can only happen when the HFile itself is corrupted.

Looking at the code, though, I see this is the only place where we access StoreFile.reader.timeRangeTracker
without a null check. So it appears we are expecting scenarios in which it can be null.

A simple fix would be:
{code}
    public long getMaxTimestamp() {
      return timeRangeTracker == null ? Long.MAX_VALUE : timeRangeTracker.maximumTimestamp;
    }
{code}


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