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From "Michael Allen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1995) TServer refuses to start if WALog file has only header and no entries
Date Mon, 09 Dec 2013 20:12:07 GMT
Michael Allen created ACCUMULO-1995:
---------------------------------------

             Summary: TServer refuses to start if WALog file has only header and no entries
                 Key: ACCUMULO-1995
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1995
             Project: Accumulo
          Issue Type: Bug
    Affects Versions: 1.6.0
            Reporter: Michael Allen


In the course of exercising Accumulo 1.6.0 with encryption turned on, we were able to get
tablet servers into the following state many times, wherein the tablet server would not start
up and instead just print this over and over to the log:

{noformat}
2013-12-09 14:13:04,487 [util.MetadataTableUtil] ERROR: java.lang.IllegalArgumentException:
Invalid path string "/accumulo/0147d545-64bd-4383-b842-27c62283c208/root_tablet/walogs/hdfs://10.10.1.10:9000/accumulo/wal/10.10.1.10+9997/e42efc86-6d83-4c0e-abd6-b16ec74d0a9f"
caused by empty node name specified @72
java.lang.IllegalArgumentException: Invalid path string "/accumulo/0147d545-64bd-4383-b842-27c62283c208/root_tablet/walogs/hdfs://10.10.1.10:9000/accumulo/wal/10.10.1.10+9997/e42efc86-6d83-4c0e-abd6-b16ec74d0a9f"
caused by empty node name specified @72
	at org.apache.zookeeper.common.PathUtils.validatePath(PathUtils.java:99)
	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1450)
	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1496)
	at org.apache.accumulo.fate.zookeeper.ZooUtil.recursiveDelete(ZooUtil.java:103)
	at org.apache.accumulo.fate.zookeeper.ZooUtil.recursiveDelete(ZooUtil.java:117)
	at org.apache.accumulo.fate.zookeeper.ZooReaderWriter.recursiveDelete(ZooReaderWriter.java:64)
	at org.apache.accumulo.server.util.MetadataTableUtil.removeUnusedWALEntries(MetadataTableUtil.java:611)
	at org.apache.accumulo.tserver.Tablet.<init>(Tablet.java:1394)
	at org.apache.accumulo.tserver.Tablet.<init>(Tablet.java:1236)
	at org.apache.accumulo.tserver.Tablet.<init>(Tablet.java:1091)
	at org.apache.accumulo.tserver.Tablet.<init>(Tablet.java:1079)
	at org.apache.accumulo.tserver.TabletServer$AssignmentHandler.run(TabletServer.java:2892)
	at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
	at org.apache.accumulo.tserver.TabletServer$ThriftClientHandler$3.run(TabletServer.java:2261)
{noformat}

The log file in question had a good header but no entries in it, probably the result of killing
a tablet server before it had any data to write.  The bug in the code has to do with how log
file names are now held within ZooKeeper (they have a full path) versus how the paths to their
metadata within  ZooKeeper are eventually constructed by {{MetadataTableUtil}}.  The fix is
relatively straightforward; you just need to take apart the full HDFS path before appending
it to a different ZooKeeper path.

Patch coming.




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