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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14223) Meta WALs are not cleared if meta region was closed and RS aborts
Date Fri, 14 Aug 2015 11:36:46 GMT
Enis Soztutar created HBASE-14223:
-------------------------------------

             Summary: Meta WALs are not cleared if meta region was closed and RS aborts
                 Key: HBASE-14223
                 URL: https://issues.apache.org/jira/browse/HBASE-14223
             Project: HBase
          Issue Type: Bug
            Reporter: Enis Soztutar
             Fix For: 2.0.0, 1.0.2, 1.2.0, 1.3.0, 1.1.3


When an RS opens meta, and later closes it, the WAL(FSHlog) is not closed. The last WAL file
just sits there in the RS WAL directory. If RS stops gracefully, the WAL file for meta is
deleted. Otherwise if RS aborts, WAL for meta is not cleaned. It is also not split (which
is correct) since master determines that the RS no longer hosts meta at the time of RS abort.


>From a cluster after running ITBLL with CM, I see a lot of {{-splitting}} directories
left uncleaned: 
{code}
[root@os-enis-dal-test-jun-4-7 cluster-os]# sudo -u hdfs hadoop fs -ls /apps/hbase/data/WALs
Found 31 items
drwxr-xr-x   - hbase hadoop          0 2015-06-05 01:14 /apps/hbase/data/WALs/hregion-58203265
drwxr-xr-x   - hbase hadoop          0 2015-06-05 07:54 /apps/hbase/data/WALs/os-enis-dal-test-jun-4-1.openstacklocal,16020,1433489308745-splitting
drwxr-xr-x   - hbase hadoop          0 2015-06-05 09:28 /apps/hbase/data/WALs/os-enis-dal-test-jun-4-1.openstacklocal,16020,1433494382959-splitting
drwxr-xr-x   - hbase hadoop          0 2015-06-05 10:01 /apps/hbase/data/WALs/os-enis-dal-test-jun-4-1.openstacklocal,16020,1433498252205-splitting
...
{code}

The directories contain WALs from meta: 
{code}
[root@os-enis-dal-test-jun-4-7 cluster-os]# sudo -u hdfs hadoop fs -ls /apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting
Found 2 items
-rw-r--r--   3 hbase hadoop     201608 2015-06-05 03:15 /apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285..meta.1433470511501.meta
-rw-r--r--   3 hbase hadoop      44420 2015-06-05 04:36 /apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285..meta.1433474111645.meta
{code}

The RS hosted the meta region for some time: 
{code}
2015-06-05 03:14:28,692 INFO  [PostOpenDeployTasks:1588230740] zookeeper.MetaTableLocator:
Setting hbase:meta region location in ZooKeeper as os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285
...
2015-06-05 03:15:17,302 INFO  [RS_CLOSE_META-os-enis-dal-test-jun-4-5:16020-0] regionserver.HRegion:
Closed hbase:meta,,1.1588230740
{code}

In between, a WAL is created: 
{code}
2015-06-05 03:15:11,707 INFO  [RS_OPEN_META-os-enis-dal-test-jun-4-5:16020-0-MetaLogRoller]
wal.FSHLog: Rolled WAL /apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285..meta.1433470511501.meta
with entries=385, filesize=196.88 KB; new WAL /apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285..meta.1433474111645.meta
{code}

When CM killed the region server later master did not see these WAL files: 
{code}
./hbase-hbase-master-os-enis-dal-test-jun-4-3.log:2015-06-05 03:36:46,075 INFO  [MASTER_SERVER_OPERATIONS-os-enis-dal-test-jun-4-3:16000-0]
master.SplitLogManager: started splitting 2 logs in [hdfs://os-enis-dal-test-jun-4-1.openstacklocal:8020/apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting]
for [os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285]
./hbase-hbase-master-os-enis-dal-test-jun-4-3.log:2015-06-05 03:36:47,300 INFO  [main-EventThread]
wal.WALSplitter: Archived processed log hdfs://os-enis-dal-test-jun-4-1.openstacklocal:8020/apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285.default.1433475074436
to hdfs://os-enis-dal-test-jun-4-1.openstacklocal:8020/apps/hbase/data/oldWALs/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285.default.1433475074436
./hbase-hbase-master-os-enis-dal-test-jun-4-3.log:2015-06-05 03:36:50,497 INFO  [main-EventThread]
wal.WALSplitter: Archived processed log hdfs://os-enis-dal-test-jun-4-1.openstacklocal:8020/apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285.default.1433475175329
to hdfs://os-enis-dal-test-jun-4-1.openstacklocal:8020/apps/hbase/data/oldWALs/os-enis-dal-test-jun-4-5.openstacklocal%2C16020%2C1433466904285.default.1433475175329
./hbase-hbase-master-os-enis-dal-test-jun-4-3.log:2015-06-05 03:36:50,507 WARN  [MASTER_SERVER_OPERATIONS-os-enis-dal-test-jun-4-3:16000-0]
master.SplitLogManager: returning success without actually splitting and deleting all the
log files in path hdfs://os-enis-dal-test-jun-4-1.openstacklocal:8020/apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting
./hbase-hbase-master-os-enis-dal-test-jun-4-3.log:2015-06-05 03:36:50,508 INFO  [MASTER_SERVER_OPERATIONS-os-enis-dal-test-jun-4-3:16000-0]
master.SplitLogManager: finished splitting (more than or equal to) 129135000 bytes in 2 log
files in [hdfs://os-enis-dal-test-jun-4-1.openstacklocal:8020/apps/hbase/data/WALs/os-enis-dal-test-jun-4-5.openstacklocal,16020,1433466904285-splitting]
in 4433ms
{code}



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