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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-16754) Regions failing compaction due to referencing non-existent store file
Date Sat, 15 Oct 2016 00:07:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-16754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Helmling updated HBASE-16754:
----------------------------------
    Status: Patch Available  (was: Open)

> 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
>    Affects Versions: 1.2.3
>            Reporter: Gary Helmling
>            Assignee: Gary Helmling
>            Priority: Blocker
>             Fix For: 1.3.0
>
>         Attachments: HBASE-16754.001.patch
>
>
> 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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