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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