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https://issues.apache.org/jira/browse/ACCUMULO-1685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764264#comment-13764264
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ASF subversion and git services commented on ACCUMULO-1685:
-----------------------------------------------------------
Commit e2bc157134878dcbf74c7a1f075219b07705bf2d in branch refs/heads/master
from [~ecn]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=e2bc157 ]
ACCUMULO-1685 noticed a double-slash in computed file names
> bench testing shows that the NN loses the WAL
> ---------------------------------------------
>
> Key: ACCUMULO-1685
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1685
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Environment: Hadoop 1.0.4, single node dev't system
> Reporter: Eric Newton
> Assignee: Eric Newton
> Priority: Critical
> Fix For: 1.6.0
>
>
> Doing bench testing; I build accumulo:
> {noformat}
> $ mvn -Pnative package -DskipTests
> {noformat}
> I go into the assembly area and configure and run accumulo
> {noformat}
> $ cd assemble/target/accumulo-1.6.0-SNAPSHOT-dev/accumulo-1.6.0-SNAPSHOT
> $ cp ~/conf/* conf
> $ hadoop fs -rmr /accumulo
> Moved to trash: hdfs://somehost:9000/accumulo
> $ ( echo test ; echo Y ; echo secret ; echo secret ) | ./bin/accumulo init
> $ 2013-09-04 12:23:51,558 [util.Initialize] INFO : Hadoop Filesystem is
> hdfs://somehost:9000
> 2013-09-04 12:23:51,559 [util.Initialize] INFO : Accumulo data dirs are
> [hdfs://somehost:9000/accumulo]
> 2013-09-04 12:23:51,559 [util.Initialize] INFO : Zookeeper server is
> localhost:2181
> 2013-09-04 12:23:51,559 [util.Initialize] INFO : Checking if Zookeeper is
> available. If this hangs, then you need to make sure zookeeper is running
> Instance name : test
> Instance name "test" exists. Delete existing entry from zookeeper? [Y/N] : Y
> Enter initial password for root (this may not be applicable for your security
> setup): ******
> Confirm initial password for root: ******
> $ ./bin/start-all.sh
> Starting monitor on localhost
> Starting tablet servers .... done
> Starting tablet server on localhost
> 2013-09-04 12:26:24,545 [server.Accumulo] INFO : Attempting to talk to
> zookeeper
> 2013-09-04 12:26:24,675 [server.Accumulo] INFO : Zookeeper connected and
> initialized, attemping to talk to HDFS
> 2013-09-04 12:26:24,679 [server.Accumulo] INFO : Connected to HDFS
> Starting master on localhost
> Starting garbage collector on localhost
> Starting tracer on localhost
> {noformat}
> Next, create a table
> {noformat}
> $ ./bin/accumulo shell -u root -p secret
> 2013-09-04 12:27:01,628 [shell.Shell] WARN : Specifying a raw password is
> deprecated.
> Shell - Apache Accumulo Interactive Shell
> -
> - version: 1.6.0-SNAPSHOT
> - instance name: test
> - instance id: 1967c1ec-cc0f-439b-b4da-4029debd16e3
> -
> - type 'help' for a list of available commands
> -
> root@test> createtable t
> root@test t>
> {noformat}
> Then I checked the tserver log for the write-ahead log created for this
> update to the root table:
> {noformat}
> $ fgrep -a /wal/ logs/tserver_*.debug.log
> 2013-09-04 12:26:27,130 [log.DfsLogger] DEBUG: Got new write-ahead log:
> localhost+9997/hdfs://rd6ul-14706v.tycho.ncsc.mil:9000/accumulo/wal/localhost+9997/1dd2727f-1de9-417b-a5a2-e56f7d8020a9
> 2013-09-04 12:26:58,264 [tabletserver.Tablet] DEBUG: Logs for memory
> compacted: !!R<<
> localhost+9997/hdfs://somehost:9000/accumulo/wal/localhost+9997/1dd2727f-1de9-417b-a5a2-e56f7d8020a9
> {noformat}
> Now, let's check for the file:
> {noformat}
> $ hadoop fs -ls
> hdfs://somehost:9000/accumulo/wal/localhost+9997/1dd2727f-1de9-417b-a5a2-e56f7d8020a9
> ls: Cannot access
> hdfs://somehost:9000/accumulo/wal/localhost+9997/1dd2727f-1de9-417b-a5a2-e56f7d8020a9:
> No such file or directory.
> {noformat}
> What?
> Check the NN logs:
> {noformat}
> $ fgrep 1dd2727f /some/log/dir/hadoop-ecnewt2-local-namenode-somehost.log
> 2013-09-04 12:26:27,075 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> NameSystem.allocateBlock:
> /accumulo/wal/localhost+9997/1dd2727f-1de9-417b-a5a2-e56f7d8020a9.
> blk_-6011963215434912690_971163
> 2013-09-04 12:26:27,113 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> NameSystem.fsync: file
> /accumulo/wal/localhost+9997/1dd2727f-1de9-417b-a5a2-e56f7d8020a9 for
> DFSClient_-787226921
> {noformat}
> So, the NN seems to be making the file, but it's not there when we go to look!
> Here's my hdfs-site.xml file:
> {noformat}
> <?xml version="1.0"?>
> <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
> <!-- Put site-specific property overrides in this file. -->
> <configuration>
> <property>
> <name>dfs.replication</name>
> <value>1</value>
> </property>
> <property>
> <name>dfs.name.dir</name>
> <value>/local/ecn/data/hadoop/nn</value>
> </property>
> <property>
> <name>dfs.data.dir</name>
>
> <value>/disk01/data/hadoop/dn,/disk02/data/hadoop/dn,/disk03/data/hadoop/dn</value>
> </property>
> <property>
> <name>dfs.support.append</name>
> <value>true</value>
> </property>
> <property>
> <name>dfs.data.synconclose</name>
> <value>true</value>
> </property>
> </configuration>
> {noformat}
> I have written an integration test that I dumped into RestartIT.java, but
> that doesn't seem to fail in same way.
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