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From "Jerry He (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12949) Scanner can be stuck in infinite loop if the HFile is corrupted
Date Thu, 05 Feb 2015 18:47:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14307748#comment-14307748
] 

Jerry He commented on HBASE-12949:
----------------------------------

Hi, [~stack], [~ram_krish]
I agree.
It is a balancing act between checking, not checking, and checking more or checking less.
We can check less, for example, only the type. 

Another option I can think of is that we have a property (say 'SanityCheckCell').  
We will only do checking when reading the cells if the property is set to true, 
for people indicating strong cell sanity check, or for people lacking strong FileSystem protection
(checksum, etc).

What do you think? 

> 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: 0.94.3, 0.98.10
>            Reporter: Jerry He
>         Attachments: HBASE-12949-master.patch
>
>
> 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) {
> }
> {code}



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