i'm not sure if using framed transport is an option with hector.
http://hector-client.github.com/hector//source/content/API/core/0.8.0-2/me/prettyprint/cassandra/service/CassandraHostConfigurator.html#setUseThriftFramedTransport(boolean)

what should i be in the logs looking for to find the cause of these dropped reads?
These look like transport errors. If something is happening on the server side it will be logged at ERROR level. 

Cheers


-----------------
Aaron Morton
Freelance Developer
@aaronmorton

On 25/05/2012, at 1:00 PM, Deno Vichas wrote:

i'm not sure if using framed transport is an option with hector.

what should i be in the logs looking for to find the cause of these dropped reads?

thanks,

On 5/24/2012 3:04 AM, aaron morton wrote:
Dropped read messages occur when the node could not process a read task within rpc_timeout. It generally means the cluster has been overwhelmed at some point:  too many requests, to much GC, compaction hurting, etc. 

Check the server side logs for errors but I doubt it is related to the call stack below. 

Have you confirmed that you are using framed transport on the client?

Cheers

-----------------
Aaron Morton
Freelance Developer
@aaronmorton

On 24/05/2012, at 5:52 PM, Deno Vichas wrote:

i've notice the my nodes seem to have a large (?, not really sure what acceptable numbers are) read dropped count from tpstats.  could they be related?

On 5/23/2012 2:55 AM, aaron morton wrote:
No sure but 

       at org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:132)

Looks like the client is not using framed transport. The server defaults to framed.

Cheers

-----------------
Aaron Morton
Freelance Developer
@aaronmorton

On 23/05/2012, at 5:35 AM, Deno Vichas wrote:

could somebody clue me in to the cause of this exception?  i see these randomly.

AnalyzerService-2 2012-05-22 13:28:00,385 :: WARN  cassandra.connection.HConnectionManager  - Exception:
me.prettyprint.hector.api.exceptions.HectorTransportException: org.apache.thrift.transport.TTransportException
       at me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:39)
       at me.prettyprint.cassandra.service.KeyspaceServiceImpl$23.execute(KeyspaceServiceImpl.java:851)
       at me.prettyprint.cassandra.service.KeyspaceServiceImpl$23.execute(KeyspaceServiceImpl.java:840)
       at me.prettyprint.cassandra.service.Operation.executeAndSetResult(Operation.java:99)
       at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:243)
       at me.prettyprint.cassandra.service.KeyspaceServiceImpl.operateWithFailover(KeyspaceServiceImpl.java:131)
       at me.prettyprint.cassandra.service.KeyspaceServiceImpl.getColumn(KeyspaceServiceImpl.java:857)
       at me.prettyprint.cassandra.model.thrift.ThriftColumnQuery$1.doInKeyspace(ThriftColumnQuery.java:57)
       at me.prettyprint.cassandra.model.thrift.ThriftColumnQuery$1.doInKeyspace(ThriftColumnQuery.java:52)
       at me.prettyprint.cassandra.model.KeyspaceOperationCallback.doInKeyspaceAndMeasure(KeyspaceOperationCallback.java:20)
       at me.prettyprint.cassandra.model.ExecutingKeyspace.doExecute(ExecutingKeyspace.java:85)
       at me.prettyprint.cassandra.model.thrift.ThriftColumnQuery.execute(ThriftColumnQuery.java:51)
       at com.stocktouch.dao.StockDaoImpl.getHistorical(StockDaoImpl.java:365)
       at com.stocktouch.dao.StockDaoImpl.getHistoricalQuote(StockDaoImpl.java:433)
       at com.stocktouch.service.StockHistoryServiceImpl.getHistoricalQuote(StockHistoryServiceImpl.java:480)
       at com.stocktouch.service.AnalyzerServiceImpl.getClose(AnalyzerServiceImpl.java:180)
       at com.stocktouch.service.AnalyzerServiceImpl.calcClosingPrices(AnalyzerServiceImpl.java:90)
       at com.stocktouch.service.AnalyzerServiceImpl.nightlyRollup(AnalyzerServiceImpl.java:66)
       at com.stocktouch.service.AnalyzerServiceImpl$2.run(AnalyzerServiceImpl.java:55)
       at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
       at java.lang.Thread.run(Thread.java:662)
Caused by: org.apache.thrift.transport.TTransportException
       at org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:132)
       at org.apache.thrift.transport.TTransport.readAll(TTransport.java:84)
       at org.apache.thrift.transport.TFramedTransport.readFrame(TFramedTransport.java:129)
       at org.apache.thrift.transport.TFramedTransport.read(TFramedTransport.java:101)
       at org.apache.thrift.transport.TTransport.readAll(TTransport.java:84)
       at org.apache.thrift.protocol.TBinaryProtocol.readAll(TBinaryProtocol.java:378)
       at org.apache.thrift.protocol.TBinaryProtocol.readI32(TBinaryProtocol.java:297)
       at org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin(TBinaryProtocol.java:204)
       at org.apache.cassandra.thrift.Cassandra$Client.recv_get(Cassandra.java:509)
       at org.apache.cassandra.thrift.Cassandra$Client.get(Cassandra.java:492)
       at me.prettyprint.cassandra.service.KeyspaceServiceImpl$23.execute(KeyspaceServiceImpl.java:846)
       ... 20 more


thanks,
deno