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https://issues.apache.org/jira/browse/HBASE-16754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15572713#comment-15572713
 ] 

Gary Helmling commented on HBASE-16754:
---------------------------------------

This particular trace is a separate issue.  It's from the race in HBASE-16788.

> Regions failing compaction due to referencing non-existent store file
> ---------------------------------------------------------------------
>
>                 Key: HBASE-16754
>                 URL: https://issues.apache.org/jira/browse/HBASE-16754
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Gary Helmling
>            Assignee: Gary Helmling
>            Priority: Blocker
>             Fix For: 1.3.0
>
>
> Running a mixed read write workload on a recent build off branch-1.3, we are 
> seeing compactions occasionally fail with errors like the following (actual 
> filenames replaced with placeholders):
> {noformat}
> 16/09/27 16:57:28 ERROR regionserver.CompactSplitThread: Compaction selection 
> failed Store = XXX, pri = 116
> java.io.FileNotFoundException: File does not exist: 
> hdfs://.../hbase/data/ns/table/region/cf/XXfilenameXX
>         at 
> org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1309)
>         at 
> org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1301)
>         at 
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>         at 
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1317)
>         at 
> org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:421)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFileInfo.getReferencedFileStatus(StoreFileInfo.java:342)
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFileInfo.getFileStatus(StoreFileInfo.java:355)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFileInfo.getModificationTime(StoreFileInfo.java:360)
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFile.getModificationTimeStamp(StoreFile.java:321)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.StoreUtils.getLowestTimestamp(StoreUtils.java:63)
>         at 
> org.apache.hadoop.hbase.regionserver.compactions.RatioBasedCompactionPolicy.shouldPerformMajorCompaction(RatioBasedCompactionPolicy.java:63)
>         at 
> org.apache.hadoop.hbase.regionserver.compactions.SortedCompactionPolicy.selectCompaction(SortedCompactionPolicy.java:82)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.DefaultStoreEngine$DefaultCompactionContext.select(DefaultStoreEngine.java:107)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.HStore.requestCompaction(HStore.java:1644)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread.selectCompaction(CompactSplitThread.java:373)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread.access$100(CompactSplitThread.java:59)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread$CompactionRunner.doCompaction(CompactSplitThread.java:498)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread$CompactionRunner.run(CompactSplitThread.java:568)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
> 16/09/27 17:01:31 ERROR regionserver.CompactSplitThread: Compaction selection 
> failed Store = XXX, pri = 115
> java.io.FileNotFoundException: File does not exist: 
> hdfs://.../hbase/data/ns/table/region/cf/XXfilenameXX
>         at 
> org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1309)
>         at 
> org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1301)
>         at 
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>         at 
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1317)
>         at 
> org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:421)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFileInfo.getReferencedFileStatus(StoreFileInfo.java:342)
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFileInfo.getFileStatus(StoreFileInfo.java:355)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFileInfo.getModificationTime(StoreFileInfo.java:360)
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFile.getModificationTimeStamp(StoreFile.java:321)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.StoreUtils.getLowestTimestamp(StoreUtils.java:63)
>         at 
> org.apache.hadoop.hbase.regionserver.compactions.RatioBasedCompactionPolicy.shouldPerformMajorCompaction(RatioBasedCompactionPolicy.java:63)
>         at 
> org.apache.hadoop.hbase.regionserver.compactions.SortedCompactionPolicy.selectCompaction(SortedCompactionPolicy.java:82)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.DefaultStoreEngine$DefaultCompactionContext.select(DefaultStoreEngine.java:107)
>   
>         at 
> org.apache.hadoop.hbase.regionserver.HStore.requestCompaction(HStore.java:1644)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread.selectCompaction(CompactSplitThread.java:373)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread.access$100(CompactSplitThread.java:59)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread$CompactionRunner.doCompaction(CompactSplitThread.java:498)
>         at 
> org.apache.hadoop.hbase.regionserver.CompactSplitThread$CompactionRunner.run(CompactSplitThread.java:568)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
> {noformat}
> It looks like we somehow deleted the underlying store file from HDFS 
> (probably after it was compacted away), after the path was loaded into the 
> list of store files for the region.
> For two cases of this that I looked into, in both cases the region in 
> question was previously hosted by a regionserver that stalled, then aborted 
> after its zk session expired.  In both cases it looked like a compaction was 
> also in progress.  So it's possible that the compacted files are being 
> deleted from HDFS by the stalled regionserver before it aborts, but after the 
> region has been opened by a new regionserver.  That's speculation though and 
> needs to be substantiated.



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