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Posted to issues@hbase.apache.org by "Duo Zhang (Jira)" <ji...@apache.org> on 2020/01/16 06:28:00 UTC
[jira] [Resolved] (HBASE-23694) After RegionProcedureStore
completes migration of WALProcedureStore, still running
WALProcedureStore.syncThread keeps trying to delete now inexistent log
files.
[ https://issues.apache.org/jira/browse/HBASE-23694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Duo Zhang resolved HBASE-23694.
-------------------------------
Hadoop Flags: Reviewed
Resolution: Fixed
Pushed to master and branch-2.
Thanks [~wchevreuil] for fixing this.
> After RegionProcedureStore completes migration of WALProcedureStore, still running WALProcedureStore.syncThread keeps trying to delete now inexistent log files.
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-23694
> URL: https://issues.apache.org/jira/browse/HBASE-23694
> Project: HBase
> Issue Type: Bug
> Components: proc-v2, RegionProcedureStore
> Affects Versions: 3.0.0
> Reporter: Wellington Chevreuil
> Assignee: Wellington Chevreuil
> Priority: Major
> Fix For: 3.0.0, 2.3.0
>
>
> With the introduction of the new procedure store to save procs on a table, instead of proc WALs, we added some migration logic to enable a smooth upgrade of clusters under previous versions that used to have proc wal files as the underlying procedure store.
> While running a fresh install with latest master branch version, I had noticed that once the old _WALProcedureStore_ directory is detected, it creates and start a WPS instance [here|https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/procedure2/store/region/RegionProcedureStore.java#L311], passing a built-in _ProcedureLoader_ [here|https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/procedure2/store/region/RegionProcedureStore.java#L315] to perform the conversion from proc wal files to table based.
> At the end of this conversion, the builtin loader deletes the proc wal dir [here|https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/procedure2/store/region/RegionProcedureStore.java#L363]. This may cause a race condition where a running _WALProcedureStore_ internal thread may be trying to delete the first proc wal file that may had already rolled, then failing with FNFE.
> Even worse is that _WALProcedureStore.syncLoop_ keeps trying indefinitely, flooding Master logs with messages such as below:
> {noformat}
> 2020-01-14 06:13:23,331 INFO [master/hbase01:16000:becomeActiveMaster] region.RegionProcedureStore: The old WALProcedureStore wal directory file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs exists, migrating...
> 2020-01-14 06:13:23,361 DEBUG [master/hbase01:16000:becomeActiveMaster] wal.WALProcedureStore: Starting WAL Procedure Store lease recovery
> 2020-01-14 06:13:23,453 INFO [master/hbase01:16000:becomeActiveMaster] wal.WALProcedureStore: Rolled new Procedure Store WAL, id=1
> 2020-01-14 06:13:23,454 DEBUG [master/hbase01:16000:becomeActiveMaster] wal.WALProcedureStore: Lease acquired for flushLogId=1
> 2020-01-14 06:13:23,454 DEBUG [master/hbase01:16000:becomeActiveMaster] wal.WALProcedureStore: No state logs to replay.
> 2020-01-14 06:13:23,454 INFO [master/hbase01:16000:becomeActiveMaster] region.RegionProcedureStore: The WALProcedureStore max pid is 0, and the max pid of all loaded procedures is -1
> 2020-01-14 06:13:23,455 INFO [master/hbase01:16000:becomeActiveMaster] region.RegionProcedureStore: Migration of WALProcedureStore finished
> 2020-01-14 06:13:23,455 INFO [master/hbase01:16000:becomeActiveMaster] procedure2.ProcedureExecutor: Recovered RegionProcedureStore lease in 784 msec
> 2020-01-14 06:13:23,471 TRACE [WALProcedureStoreSyncThread] wal.WALProcedureStore: no active procedures
> 2020-01-14 06:13:23,516 INFO [master/hbase01:16000:becomeActiveMaster] procedure2.ProcedureExecutor: Loaded RegionProcedureStore in 61 msec
> 2020-01-14 06:13:23,516 INFO [master/hbase01:16000:becomeActiveMaster] procedure2.RemoteProcedureDispatcher: Instantiated, coreThreads=128 (allowCoreThreadTimeOut=true), queueMaxSize=32, operationDelay=150
> 2020-01-14 06:13:23,628 INFO [WALProcedureStoreSyncThread] wal.WALProcedureStore: Rolled new Procedure Store WAL, id=2
> 2020-01-14 06:13:23,634 INFO [WALProcedureStoreSyncThread] wal.WALProcedureStore: Remove all state logs with ID less than 1, since no active procedures
> 2020-01-14 06:13:23,634 TRACE [WALProcedureStoreSyncThread] wal.WALProcedureStore: Removing log=file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log
> 2020-01-14 06:13:23,634 INFO [WALProcedureStoreSyncThread] wal.ProcedureWALFile: Archiving file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log to file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/oldWALs/pv2-00000000000000000001.log
> 2020-01-14 06:13:23,634 ERROR [WALProcedureStoreSyncThread] wal.WALProcedureStore: Unable to remove log: file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log
> java.io.FileNotFoundException: File file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log does not exist
> ...
> 2020-01-14 06:13:23,635 ERROR [WALProcedureStoreSyncThread] wal.WALProcedureStore: Unable to remove log: file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log
> java.io.FileNotFoundException: File file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log does not exist
> at org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:635)
> ...
> 2020-01-14 06:13:37,352 ERROR [WALProcedureStoreSyncThread] wal.WALProcedureStore: Unable to remove log: file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log
> java.io.FileNotFoundException: File file:/root/hbase-3.0.0-SNAPSHOT/hbase-data/MasterProcWALs/pv2-00000000000000000001.log does not exist
> at org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:635)
> {noformat}
> I believe a simple solution in this case is to explicitly call _WALProcedureStore.stop_ method at the end of the migration, which stops _WALProcedureStore_ internal _syncLoop_ thread.
> Am opening a PR soon.
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