Too Many open file exception while indexin using solr

I am using SOLR for indexing documents in my web application and solr.war is deployed on the jboss server. But while indexing i am getting too many files开发者_开发知识库 open exception. Below is some of exceptions stack trace:

12:31:33,267 ERROR [STDERR] Exception in thread "Lucene Merge Thread #0"
12:31:33,267 ERROR [STDERR] org.apache.lucene.index.MergePolicy$MergeException: java.io.FileNotFoundException: /data/jbossesb/bin/solr/data/index/_2rw.prx (Too many open files)
12:31:33,267 ERROR [STDERR] at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:351)
12:31:33,267 ERROR [STDERR] at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:315)
12:31:33,267 ERROR [STDERR] Caused by: java.io.FileNotFoundException: /data/jbossesb/bin/solr/data/index/_2rw.prx (Too many open files)
12:31:33,267 ERROR [STDERR] at java.io.RandomAccessFile.open(Native Method)

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As explained in this SOLR Jira, you can try the following options:

• increasing your ulimit using: ulimit -n 1000000
• set useCompoundFile to true in solrconfig.xml to use Lucene's compound file format
• use a lower mergeFactor which will result in fewer segments and hence fewer open files.

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File Descriptor will be your most likely cause.

Check the limit which your operating system has set. and adjust accordingliy. on Unix, the command to view and set is ulimit.

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Optimize the index. It probably has too many segments.

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Also try reducing the merge factor