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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18771) Incorrect StoreFileRefresh leading to split and compaction failures
Date Fri, 08 Sep 2017 04:57:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158128#comment-16158128

ramkrishna.s.vasudevan commented on HBASE-18771:

+1 for patch. Thanks for the great find. Probably there is Phoenix CP here in this stack trace
which could have resulted in this case of FNFE and also the code expects FNFE to occur in
these cases so fixing refreshStoreFiles should solve multiple JIRAs raised related to this.
One quesiton on the test case - does this test case fail always without patch or you need
to introduce some locking / new threads to introduce the actual bug? Because all are sequential
in the tests now and what if closeAndArchiveCompactedFiles() gets completed and then the hr.compact(false)
gets executed? 
You can commit this to branch-1.3 and probably for branch-2 and above too if you can produce
a test case.

> Incorrect StoreFileRefresh leading to split and compaction failures
> -------------------------------------------------------------------
>                 Key: HBASE-18771
>                 URL: https://issues.apache.org/jira/browse/HBASE-18771
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.3.1
>            Reporter: Abhishek Singh Chouhan
>            Assignee: Abhishek Singh Chouhan
>            Priority: Blocker
>             Fix For: 1.4.0, 1.3.2, 1.5.0
>         Attachments: HBASE-18771.branch-1.3.001.patch, HBASE-18771.branch-1.3.002.patch
> We ran into issues of compaction and split failures with 1.3 similar to HBASE-18186 and
HBASE-17406. Here's what i believe is happening -
> Lets say we have 4 store files that are compacted to form a new one. At this point we
now have 5 store files, however only 1(the newly formed) is open now for the store and rest
are waiting to get archived by HFileArchiver
> Now before the files are archived we get a FNFE in a scanner. This results in HRegion.RegionScannerImpl.handleFileNotFound(FileNotFoundException
fnfe) being called which results in region.refreshStoreFiles(true) -> HStore.refreshStoreFiles()
> HStore.refreshStoreFiles now checks the hdfs dir and adds the previously compacted files
back to the store, however these files are also present in StoreFileManager's compactedFiles
list. Now at this point HFileArchiver runs, checks compactedFiles list and moves these files
into the archive directory. 
> Now when compaction runs it gets:
> 2017-09-04 12:30:13,899 ERROR [ctions-1504505399609] regionserver.CompactSplitThread
- Compaction selection failed regionName = xxxx, storeName = 0, priority = 26, time = 1504528213899
> java.io.FileNotFoundException: File does not exist: hdfs://xxxx
>         at org.apache.hadoop.hdfs.DistributedFileSystem$23.doCall(DistributedFileSystem.java:1337)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$23.doCall(DistributedFileSystem.java:1329)
>         at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1329)
>         at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:422)
>         at org.apache.hadoop.hbase.regionserver.StoreFileInfo.getReferencedFileStatus(StoreFileInfo.java:342)
>         at org.apache.hadoop.hbase.regionserver.StoreFileInfo.getFileStatus(StoreFileInfo.java:355)
>         at org.apache.hadoop.hbase.regionserver.StoreFileInfo.getModificationTime(StoreFileInfo.java:360)
>         at org.apache.hadoop.hbase.regionserver.StoreFile.getModificationTimeStamp(StoreFile.java:325)
>         at org.apache.hadoop.hbase.regionserver.StoreUtils.getLowestTimestamp(StoreUtils.java:63)
>         at org.apache.hadoop.hbase.regionserver.compactions.RatioBasedCompactionPolicy.shouldPerformMajorCompaction(RatioBasedCompactionPolicy.java:65)
>         at org.apache.hadoop.hbase.regionserver.compactions.SortedCompactionPolicy.selectCompaction(SortedCompactionPolicy.java:82)
>         at org.apache.hadoop.hbase.regionserver.DefaultStoreEngine$DefaultCompactionContext.select(DefaultStoreEngine.java:107)
>         at org.apache.hadoop.hbase.regionserver.HStore.requestCompaction(HStore.java:1679)
> Similarly if a split happens after archival we fail after PONR while opening daughter
regions due to FNFE. This results in parent offline and daughters also in a limbo since they're
unable to open. Since we get the error after PONR we also end up aborting the RS.

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