Rajeshbabu Chintaguntla created HBASE-12791:
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Summary: HBase does not attempt to clean up an aborted split when
the regionserver shutting down
Key: HBASE-12791
URL: https://issues.apache.org/jira/browse/HBASE-12791
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 0.98.0
Reporter: Rajeshbabu Chintaguntla
Assignee: Rajeshbabu Chintaguntla
Priority: Critical
Fix For: 2.0.0, 0.98.10, 1.0.1
HBase not cleaning the daughter region directories from HDFS if region server
shut down after creating the daughter region directories during the split.
Here the logs.
-> RS shutdown after creating the daughter regions.
{code}
2014-12-31 09:05:41,406 DEBUG [regionserver60020-splits-1419996941385]
zookeeper.ZKAssign: regionserver:60020-0x14a9701e53100d1,
quorum=localhost:2181, baseZNode=/hbase Transitioned node
80c665138d4fa32da4d792d8ed13206f from RS_ZK_REQUEST_REGION_SPLIT to
RS_ZK_REQUEST_REGION_SPLIT
2014-12-31 09:05:41,514 DEBUG [regionserver60020-splits-1419996941385]
regionserver.HRegion: Closing
t,,1419996880699.80c665138d4fa32da4d792d8ed13206f.: disabling compactions &
flushes
2014-12-31 09:05:41,514 DEBUG [regionserver60020-splits-1419996941385]
regionserver.HRegion: Updates disabled for region
t,,1419996880699.80c665138d4fa32da4d792d8ed13206f.
2014-12-31 09:05:41,516 INFO
[StoreCloserThread-t,,1419996880699.80c665138d4fa32da4d792d8ed13206f.-1]
regionserver.HStore: Closed f
2014-12-31 09:05:41,518 INFO [regionserver60020-splits-1419996941385]
regionserver.HRegion: Closed t,,1419996880699.80c665138d4fa32da4d792d8ed13206f.
2014-12-31 09:05:49,922 DEBUG [regionserver60020-splits-1419996941385]
regionserver.MetricsRegionSourceImpl: Creating new MetricsRegionSourceImpl for
table t dd9731ee43b104da565257ca1539aa8c
2014-12-31 09:05:49,922 DEBUG [regionserver60020-splits-1419996941385]
regionserver.HRegion: Instantiated
t,,1419996941401.dd9731ee43b104da565257ca1539aa8c.
2014-12-31 09:05:49,929 DEBUG [regionserver60020-splits-1419996941385]
regionserver.MetricsRegionSourceImpl: Creating new MetricsRegionSourceImpl for
table t 2e40a44511c0e187d357d651f13a1dab
2014-12-31 09:05:49,929 DEBUG [regionserver60020-splits-1419996941385]
regionserver.HRegion: Instantiated
t,row2,1419996941401.2e40a44511c0e187d357d651f13a1dab.
Wed Dec 31 09:06:30 IST 2014 Terminating regionserver
2014-12-31 09:06:30,465 INFO [Thread-8] regionserver.ShutdownHook: Shutdown
hook starting; hbase.shutdown.hook=true;
fsShutdownHook=org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer@42d2282e
{code}
-> Skipping rollback if RS stopped or stopping so we end up in dirty daughter
regions in HDFS.
{code}
2014-12-31 09:07:49,547 INFO [regionserver60020-splits-1419996941385]
regionserver.SplitRequest: Skip rollback/cleanup of failed split of
t,,1419996880699.80c665138d4fa32da4d792d8ed13206f. because server is stopped
java.io.InterruptedIOException: Interrupted after 0 tries on 350
at
org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:156)
{code}
Because of this hbck always showing inconsistencies.
{code}
ERROR: Region { meta => null, hdfs =>
hdfs://localhost:9000/hbase/data/default/t/2e40a44511c0e187d357d651f13a1dab,
deployed => } on HDFS, but not listed in hbase:meta or deployed on any region
server
ERROR: Region { meta => null, hdfs =>
hdfs://localhost:9000/hbase/data/default/t/dd9731ee43b104da565257ca1539aa8c,
deployed => } on HDFS, but not listed in hbase:meta or deployed on any region
server
{code}
If we try to repair then we end up in overlap regions in hbase:meta.
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