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From Edmond Lau <edm...@ooyala.com>
Subject read repair keeps occurring on every quorum read
Date Sat, 26 Sep 2009 00:39:48 GMT
I have a 3 node cluster with a replication factor of 2, running on 0.4
RC1.  I've set both my read and write consistency levels to use a
quorum.

I'm observing that quorum reads keep invoking read repair and log
DigestMismatchExceptions from the StorageProxy.  Obviously, this
significantly reduces my read throughput.  In the absence of any
additional inserts, I'd expect that read repair would happen at most
once before the 2 nodes responsible for the data both have fresh views
of the data.

Here's what I see in my debug log for one machine on two consecutive
quorum reads for the data.  I get similar messages when querying any
of the 3 nodes.  Similar messages are logged on subsequent queries for
the exact same row/column.  The issue happens when reading both
supercolumns or columns.  Restarting the cluster has no effect.

DEBUG [pool-1-thread-1] 2009-09-26 00:26:20,317 CassandraServer.java
(line 305) multiget
DEBUG [pool-1-thread-1] 2009-09-26 00:26:20,360 StorageProxy.java
(line 375) strongread reading data for
SliceByNamesReadCommand(table='Analytics', key='test',
columnParent='QueryPath(columnFamilyName='Domain',
superColumnName='null', co\
lumnName='null')', columns=[www.ooyala.com,]) from 17@172.16.130.130:7000
DEBUG [pool-1-thread-1] 2009-09-26 00:26:20,365 StorageProxy.java
(line 382) strongread reading digest for
SliceByNamesReadCommand(table='Analytics', key='test',
columnParent='QueryPath(columnFamilyName='Domain',
superColumnName='null', \
columnName='null')', columns=[www.ooyala.com,]) from 18@172.16.130.131:7000
DEBUG [ROW-READ-STAGE:1] 2009-09-26 00:26:20,380 ReadVerbHandler.java
(line 100) Read key test; sending response to
EEF5BCFF-D592-F1DE-6DEE-B74029218A29@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:1] 2009-09-26 00:26:20,387
ResponseVerbHandler.java (line 34) Processing response on a callback
from EEF5BCFF-D592-F1DE-6DEE-B74029218A29@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:2] 2009-09-26 00:26:20,449
ResponseVerbHandler.java (line 34) Processing response on a callback
from EEF5BCFF-D592-F1DE-6DEE-B74029218A29@172.16.130.131:7000
DEBUG [pool-1-thread-1] 2009-09-26 00:26:20,474
ReadResponseResolver.java (line 84) Response deserialization time : 0
ms.
DEBUG [pool-1-thread-1] 2009-09-26 00:26:20,474
ReadResponseResolver.java (line 84) Response deserialization time : 0
ms.
 INFO [pool-1-thread-1] 2009-09-26 00:26:20,475 StorageProxy.java
(line 411) DigestMismatchException: test
DEBUG [ROW-READ-STAGE:2] 2009-09-26 00:26:20,477 ReadVerbHandler.java
(line 100) Read key test; sending response to 19@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:3] 2009-09-26 00:26:20,478
ResponseVerbHandler.java (line 34) Processing response on a callback
from 19@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:4] 2009-09-26 00:26:20,480
ResponseVerbHandler.java (line 34) Processing response on a callback
from 19@172.16.130.131:7000
DEBUG [pool-1-thread-1] 2009-09-26 00:26:20,481
ReadResponseResolver.java (line 84) Response deserialization time : 0
ms.
DEBUG [pool-1-thread-1] 2009-09-26 00:26:20,481
ReadResponseResolver.java (line 84) Response deserialization time : 0
ms.
 INFO [pool-1-thread-1] 2009-09-26 00:26:20,482
ReadResponseResolver.java (line 148) resolve: 1 ms.
DEBUG [pool-1-thread-2] 2009-09-26 00:27:22,099 CassandraServer.java
(line 305) multiget
DEBUG [pool-1-thread-2] 2009-09-26 00:27:22,100 StorageProxy.java
(line 375) strongread reading data for
SliceByNamesReadCommand(table='Analytics', key='test',
columnParent='QueryPath(columnFamilyName='Domain',
superColumnName='null', co\
lumnName='null')', columns=[www.ooyala.com,]) from 224@172.16.130.130:7000
DEBUG [pool-1-thread-2] 2009-09-26 00:27:22,100 StorageProxy.java
(line 382) strongread reading digest for
SliceByNamesReadCommand(table='Analytics', key='test',
columnParent='QueryPath(columnFamilyName='Domain',
superColumnName='null', \
columnName='null')', columns=[www.ooyala.com,]) from 225@172.16.130.131:7000
DEBUG [ROW-READ-STAGE:1] 2009-09-26 00:27:22,103 ReadVerbHandler.java
(line 100) Read key test; sending response to
CD1A7545-F759-1CA7-4D17-87FA4A16E2E4@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:1] 2009-09-26 00:27:22,103
ResponseVerbHandler.java (line 34) Processing response on a callback
from CD1A7545-F759-1CA7-4D17-87FA4A16E2E4@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:2] 2009-09-26 00:27:22,107
ResponseVerbHandler.java (line 34) Processing response on a callback
from CD1A7545-F759-1CA7-4D17-87FA4A16E2E4@172.16.130.131:7000
DEBUG [pool-1-thread-2] 2009-09-26 00:27:22,108
ReadResponseResolver.java (line 84) Response deserialization time : 1
ms.
DEBUG [pool-1-thread-2] 2009-09-26 00:27:22,108
ReadResponseResolver.java (line 84) Response deserialization time : 0
ms.
 INFO [pool-1-thread-2] 2009-09-26 00:27:22,109 StorageProxy.java
(line 411) DigestMismatchException: test
DEBUG [ROW-READ-STAGE:2] 2009-09-26 00:27:22,114 ReadVerbHandler.java
(line 100) Read key test; sending response to 226@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:3] 2009-09-26 00:27:22,114
ResponseVerbHandler.java (line 34) Processing response on a callback
from 226@172.16.130.130:7000
DEBUG [RESPONSE-STAGE:4] 2009-09-26 00:27:22,205
ResponseVerbHandler.java (line 34) Processing response on a callback
from 226@172.16.130.131:7000
DEBUG [pool-1-thread-2] 2009-09-26 00:27:22,206
ReadResponseResolver.java (line 84) Response deserialization time : 0
ms.
DEBUG [pool-1-thread-2] 2009-09-26 00:27:22,206
ReadResponseResolver.java (line 84) Response deserialization time : 0
ms.
 INFO [pool-1-thread-2] 2009-09-26 00:27:22,207
ReadResponseResolver.java (line 148) resolve: 1 ms.

Thoughts?

Edmond

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