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From Colin Britton <colin.brit...@gmail.com>
Subject Secondary Index Null Pointer Error
Date Thu, 16 Sep 2010 17:53:32 GMT
Hi,

I am using Casandra 0.7 trunk (r997357) and am having issues with a
secondary index.

I have a ColumnFamily with a secondary index on column "X". Not every row of
data has column X. It looks like when I write a row that does not have
column X, Cassandra throws the following NPE when it writes the index:

ERROR 20:05:37,015 Uncaught exception in thread
Thread[FLUSH-WRITER-POOL:1,5,main]
java.util.concurrent.ExecutionException: java.lang.RuntimeException:
java.lang.NullPointerException
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
    at java.util.concurrent.FutureTask.get(FutureTask.java:83)
    at
org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:87)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:637)
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
    at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:34)
    at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    ... 2 more
Caused by: java.lang.NullPointerException
    at
org.apache.cassandra.io.sstable.IndexSummary.complete(IndexSummary.java:63)
    at
org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.close(SSTableWriter.java:383)
    at
org.apache.cassandra.io.sstable.SSTableWriter.closeAndOpenReader(SSTableWriter.java:138)
    at
org.apache.cassandra.io.sstable.SSTableWriter.closeAndOpenReader(SSTableWriter.java:132)
    at
org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:156)
    at org.apache.cassandra.db.Memtable.access$000(Memtable.java:44)
    at org.apache.cassandra.db.Memtable$1.runMayThrow(Memtable.java:168)
    at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
    ... 6 more

This doesn't necessarily happen as soon as the row is written; it happens
after you write enough rows, or after a restart of the server when the
commitlog is replayed.

Is it the case that indexed columns must exist?

Thanks

Colin

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