Zhou wenjian created HBASE-6588:
-----------------------------------
Summary: enable table throws npe and leaves trash in zk in
competition with delete table
Key: HBASE-6588
URL: https://issues.apache.org/jira/browse/HBASE-6588
Project: HBase
Issue Type: Bug
Affects Versions: 0.94.0
Reporter: Zhou wenjian
Fix For: 0.94.2
2012-08-15 19:23:36,178 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Creating scanner over .META. starting at key 'test,,'
2012-08-15 19:23:36,178 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Advancing internal scanner to startKey at 'test,,'
2012-08-15 19:24:09,180 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Creating scanner over .META. starting at key ''
2012-08-15 19:24:09,180 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Advancing internal scanner to startKey at ''
2012-08-15 19:24:09,183 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Finished with scanning at {NAME => '.META.,,1', STARTKEY => '', ENDKEY => '',
ENCODED => 1028785192,}
2012-08-15 19:24:09,183 DEBUG org.apache.hadoop.hbase.master.CatalogJanitor:
Scanned 2 catalog row(s) and gc'd 0 unreferenced parent region(s)
2012-08-15 19:25:12,260 DEBUG
org.apache.hadoop.hbase.master.handler.DeleteTableHandler: Deleting region
test,,1345029764571.d1e24b251ca6286c840a9a5f571b7db1. from META and FS
2012-08-15 19:25:12,263 INFO org.apache.hadoop.hbase.catalog.MetaEditor:
Deleted region test,,1345029764571.d1e24b251ca6286c840a9a5f571b7db1. from META
2012-08-15 19:25:12,265 INFO
org.apache.hadoop.hbase.master.handler.EnableTableHandler: Attemping to enable
the table test
2012-08-15 19:25:12,265 WARN org.apache.hadoop.hbase.zookeeper.ZKTable: Moving
table test state to enabling but was not first in disabled state: null
2012-08-15 19:25:12,267 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Creating scanner over .META. starting at key 'test,,'
2012-08-15 19:25:12,267 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Advancing internal scanner to startKey at 'test,,'
2012-08-15 19:25:12,270 DEBUG org.apache.hadoop.hbase.client.ClientScanner:
Finished with scanning at {NAME => '.META.,,1', STARTKEY => '', ENDKEY => '',
ENCODED => 1028785192,}
2012-08-15 19:25:12,270 ERROR org.apache.hadoop.hbase.executor.EventHandler:
Caught throwable while processing event C_M_ENABLE_TABLE
java.lang.NullPointerException
at
org.apache.hadoop.hbase.master.handler.EnableTableHandler.handleEnableTable(EnableTableHandler.java:116)
at
org.apache.hadoop.hbase.master.handler.EnableTableHandler.process(EnableTableHandler.java:97)
at
org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
table is disabled now, then we enable and delete the table at the same time.
Since the thread num of MASTER_TABLE_OPERATIONS is 1 by default. The two
operations are serial in master.Before deletetable deletes all the regions in
meta, CreateTableHandler ships the check of tableExists,then it will block
until deletetable finishs, then CreateTableHandler will set zk enabling, and
find no data in meta:
regionsInMeta = MetaReader.getTableRegions(this.ct, tableName, true);
int countOfRegionsInTable = regionsInMeta.size();
npe will be throwed here. And we could not create the same table anymore.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
