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Date: Fri, 30 Jan 2015 20:11:35 +0000 (UTC)
From: "Jerry He (JIRA)" <jira@apache.org>
To: dev@hbase.apache.org
Message-ID: <JIRA.12771414.1422648661000.218056.1422648695464@Atlassian.JIRA>
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Subject: [jira] [Created] (HBASE-12949) Scanner can be stuck in infinite
 loop if the HFile is corrupted
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Jerry He created HBASE-12949:
--------------------------------

             Summary: Scanner can be stuck in infinite loop if the HFile is corrupted
                 Key: HBASE-12949
                 URL: https://issues.apache.org/jira/browse/HBASE-12949
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.98.10
            Reporter: Jerry He


We've encountered problem where compaction hangs and never completes.
After looking into it further, we found that the compaction scanner was stuck in a infinite loop. See stack below.
{noformat}
org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:296)
org.apache.hadoop.hbase.regionserver.KeyValueHeap.reseek(KeyValueHeap.java:257)
org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:697)
org.apache.hadoop.hbase.regionserver.StoreScanner.seekToNextRow(StoreScanner.java:672)
org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:529)
org.apache.hadoop.hbase.regionserver.compactions.Compactor.performCompaction(Compactor.java:223)
{noformat}

We identified the hfile that seems to be corrupted.  Using HFile tool shows the following:
{noformat}
[biadmin@hdtest009 bin]$ hbase org.apache.hadoop.hbase.io.hfile.HFile -v -k -m -f /user/biadmin/CUMMINS_INSITE_V1/7106432d294dd844be15996ccbf2ba84/attributes/f1a7e3113c2c4047ac1fc8fbcb41d8b7
15/01/23 11:53:17 INFO Configuration.deprecation: hadoop.native.lib is deprecated. Instead, use io.native.lib.available
15/01/23 11:53:18 INFO util.ChecksumType: Checksum using org.apache.hadoop.util.PureJavaCrc32
15/01/23 11:53:18 INFO util.ChecksumType: Checksum can use org.apache.hadoop.util.PureJavaCrc32C
15/01/23 11:53:18 INFO Configuration.deprecation: fs.default.name is deprecated. Instead, use fs.defaultFS
Scanning -> /user/biadmin/CUMMINS_INSITE_V1/7106432d294dd844be15996ccbf2ba84/attributes/f1a7e3113c2c4047ac1fc8fbcb41d8b7
WARNING, previous row is greater then current row
        filename -> /user/biadmin/CUMMINS_INSITE_V1/7106432d294dd844be15996ccbf2ba84/attributes/f1a7e3113c2c4047ac1fc8fbcb41d8b7
        previous -> \x00/20110203-094231205-79442793-1410161293068203000\x0Aattributes16794406\x00\x00\x01\x00\x00\x00\x00\x00\x00
        current  ->
Exception in thread "main" java.nio.BufferUnderflowException
        at java.nio.Buffer.nextGetIndex(Buffer.java:489)
        at java.nio.HeapByteBuffer.getInt(HeapByteBuffer.java:347)
        at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$ScannerV2.readKeyValueLen(HFileReaderV2.java:856)
        at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$ScannerV2.next(HFileReaderV2.java:768)
        at org.apache.hadoop.hbase.io.hfile.HFilePrettyPrinter.scanKeysValues(HFilePrettyPrinter.java:362)
        at org.apache.hadoop.hbase.io.hfile.HFilePrettyPrinter.processFile(HFilePrettyPrinter.java:262)
        at org.apache.hadoop.hbase.io.hfile.HFilePrettyPrinter.run(HFilePrettyPrinter.java:220)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.hbase.io.hfile.HFilePrettyPrinter.main(HFilePrettyPrinter.java:539)
        at org.apache.hadoop.hbase.io.hfile.HFile.main(HFile.java:802)
{noformat}

Turning on Java Assert shows the following:
{noformat}
Exception in thread "main" java.lang.AssertionError: Key 20110203-094231205-79442793-1410161293068203000/attributes:16794406/1099511627776/Minimum/vlen=15/mvcc=0 followed by a smaller key //0/Minimum/vlen=0/mvcc=0 in cf attributes
        at org.apache.hadoop.hbase.regionserver.StoreScanner.checkScanOrder(StoreScanner.java:672)
{noformat}

It shows that the hfile seems to be corrupted -- the keys don't seem to be right.
But Scanner is not able to give a meaningful error, but stuck in an infinite loop in here:
{code}
KeyValueHeap.generalizedSeek()
while ((scanner = heap.poll()) != null) {
}


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