ninja remove commitlog_periodic_queue_size from cassandra.yaml, and @Deprecate in Config.java

conf/cassandra.yaml

@@ -236,13 +236,9 @@ counter_cache_save_period: 7200
 #
 # the other option is "periodic" where writes may be acked immediately
 # and the CommitLog is simply synced every commitlog_sync_period_in_ms
-# milliseconds.  commitlog_periodic_queue_size allows 1024*(CPU cores) pending
-# entries on the commitlog queue by default.  If you are writing very large
-# blobs, you should reduce that; 16*cores works reasonably well for 1MB blobs.
-# It should be at least as large as the concurrent_writes setting.
+# milliseconds. 
 commitlog_sync: periodic
 commitlog_sync_period_in_ms: 10000
-# commitlog_periodic_queue_size:
 
 # The size of the individual commitlog file segments.  A commitlog
 # segment may be archived, deleted, or recycled once all the data

src/java/org/apache/cassandra/config/Config.java

@@ -153,7 +153,9 @@ public class Config
     public Double commitlog_sync_batch_window_in_ms;
     public Integer commitlog_sync_period_in_ms;
     public int commitlog_segment_size_in_mb = 32;
-    public int commitlog_periodic_queue_size = 1024 * FBUtilities.getAvailableProcessors();
+ 
+    @Deprecated
+    public int commitlog_periodic_queue_size = -1;
 
     public String endpoint_snitch;
     public Boolean dynamic_snitch = true;