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https://issues.apache.org/jira/browse/HBASE-15019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15066796#comment-15066796
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stack commented on HBASE-15019:
-------------------------------
bq. since we know that the RS is still going, should we try to recover the
lease on the RS side? is it better/safer to trigger an abort on the RS, so we
have only the master doing lease recovery?
Would be sweet if could avoid killing the RS. Can we figure out the explicit
case of a replicating RS that comes across a log that needs lease recovery AND
the log was written by this RS instance AND HDFS is healthy now -- i.e. the
subsequent WAL log, the one that came after the one that needs recovering, is
good...
I suppose the only scenario where the subsequent log is good would be this case
where HDFS has been restarted underneath us. There are likely probings we can
do to recognize this particular case and only here, let RS do lease recovery.
IIRC, if a process asks NN to recover a lease and it is taking a while.... and
then the process asks again that the NN recover the lease, on receipt of the
second call, the NN starts over from scratch the whole lease recovery process.
The lease never recovers if the period at which the client process asks for a
lease recovery is retried at a period that is less than the amount of time it
takes to recover.
If a Master and a RS got into a situation where they were both trying to
recover a lease, could end up fighting each other and frustrating lease
recovery totally.
> Replication stuck when HDFS is restarted
> ----------------------------------------
>
> Key: HBASE-15019
> URL: https://issues.apache.org/jira/browse/HBASE-15019
> Project: HBase
> Issue Type: Bug
> Components: Replication, wal
> Affects Versions: 2.0.0, 1.2.0, 1.1.2, 1.0.3, 0.98.16.1
> Reporter: Matteo Bertozzi
> Assignee: Matteo Bertozzi
>
> RS is normally working and writing on the WAL.
> HDFS is killed and restarted, and the RS try to do a roll.
> The close fail, but the roll succeed (because hdfs is now up) and everything
> works.
> {noformat}
> 2015-12-11 21:52:28,058 ERROR
> org.apache.hadoop.hbase.regionserver.wal.ProtobufLogWriter: Got IOException
> while writing trailer
> java.io.IOException: All datanodes 10.51.30.152:50010 are bad. Aborting...
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1147)
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:945)
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:496)
> 2015-12-11 21:52:28,059 ERROR
> org.apache.hadoop.hbase.regionserver.wal.FSHLog: Failed close of HLog writer
> java.io.IOException: All datanodes 10.51.30.152:50010 are bad. Aborting...
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1147)
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:945)
> at
> org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:496)
> 2015-12-11 21:52:28,059 WARN org.apache.hadoop.hbase.regionserver.wal.FSHLog:
> Riding over HLog close failure! error count=1
> {noformat}
> The problem is on the replication side. that log we rolled and we were not
> able to close
> is waiting for a lease recovery.
> {noformat}
> 2015-12-11 21:16:31,909 ERROR
> org.apache.hadoop.hbase.regionserver.wal.HLogFactory: Can't open after 267
> attempts and 301124ms
> {noformat}
> the WALFactory notify us about that, but there is nothing on the RS side that
> perform the WAL recovery.
> {noformat}
> 2015-12-11 21:11:30,921 WARN
> org.apache.hadoop.hbase.regionserver.wal.HLogFactory: Lease should have
> recovered. This is not expected. Will retry
> java.io.IOException: Cannot obtain block length for
> LocatedBlock{BP-1547065147-10.51.30.152-1446756937665:blk_1073801614_61243;
> getBlockSize()=83; corrupt=false; offset=0; locs=[10.51.30.154:50010,
> 10.51.30.152:50010, 10.51.30.155:50010]}
> at
> org.apache.hadoop.hdfs.DFSInputStream.readBlockLength(DFSInputStream.java:358)
> at
> org.apache.hadoop.hdfs.DFSInputStream.fetchLocatedBlocksAndGetLastBlockLength(DFSInputStream.java:300)
> at org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:237)
> at org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:230)
> at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1448)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:301)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:297)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:297)
> at org.apache.hadoop.fs.FilterFileSystem.open(FilterFileSystem.java:161)
> at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:766)
> at
> org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:116)
> at
> org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:89)
> at
> org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:77)
> at
> org.apache.hadoop.hbase.replication.regionserver.ReplicationHLogReaderManager.openReader(ReplicationHLogReaderManager.java:68)
> at
> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:508)
> at
> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:321)
> {noformat}
> the only way to trigger a WAL recovery is to restart and force the master to
> trigger the lease recovery on WAL split.
> since we know that the RS is still going, should we try to recover the lease
> on the RS side?
> is it better/safer to trigger an abort on the RS, so we have only the master
> doing lease recovery?
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