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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 Sat, 07 Feb 2015 00:31:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310295#comment-14310295
] 

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

Hi, [~stack], [~ram_krish]

Thanks for the comments.
Did a quick dig on the HBase checksum a little as you guys pointed.
The code is doing what is documented, which is:
HBase checksum is on by default, HBase will verify checksums for hfile blocks. Checksum verification
inside FileSystem will be switched off.
If the hbase-checksum verification fails, it will fall back to using FileSystem checksums.
And it will go back to HBase Checksum later, as Stack mentioned, presumably HDFS will get
the good blocks again.

> 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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