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Chukwa >> mail # user >> HBaseWriter.add() - java.lang.NullPointerException


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HBaseWriter.add() - java.lang.NullPointerException
Hi,

I'm trying to debug the following stack trace.
I'm getting a ton of these and then my collector just stops accepting any
logs(although the process appears to be up and running).
If I restart my collector, it starts running fine until it craps out again
in a few days.

Sample stack trace from collector.log :

2012-11-14 10:12:01,296 WARN btpool0-1515 HBaseWriter.add() - []
2012-11-14 10:12:01,296 WARN btpool0-1515 HBaseWriter.add() -
java.lang.NullPointerException
        at
org.apache.hadoop.hbase.ipc.HBaseClient$Connection.sendParam(HBaseClient.java:503)
        at
org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:751)
        at
org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:257)
        at $Proxy5.getClosestRowBefore(Unknown Source)
        at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:720)
        at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:590)
        at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:559)
        at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:688)
        at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:594)
        at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:559)
        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:173)
        at
org.apache.hadoop.hbase.client.HTableFactory.createHTableInterface(HTableFactory.java:36)
        at
org.apache.hadoop.hbase.client.HTablePool.createHTable(HTablePool.java:133)
        at
org.apache.hadoop.hbase.client.HTablePool.getTable(HTablePool.java:96)
        at
org.apache.hadoop.hbase.client.HTablePool.getTable(HTablePool.java:110)
        at
org.apache.hadoop.chukwa.datacollection.writer.hbase.HBaseWriter.add(HBaseWriter.java:193)
        at
org.apache.hadoop.chukwa.datacollection.writer.SocketTeeWriter.add(SocketTeeWriter.java:252)
        at
org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.add(PipelineStageWriter.java:40)
        at
org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.accept(ServletCollector.java:159)
        at
org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.doPost(ServletCollector.java:208)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
        at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
        at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
        at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
        at
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)
--
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