[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14158040#comment-14158040 ] Aleksey Yeschenko commented on CASSANDRA-7930: -- bq. So anything that can be made private static should be. Agreed. [~tjake] is there a ticket for that already? Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Fix For: 2.1.1 Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14158482#comment-14158482 ] T Jake Luciani commented on CASSANDRA-7930: --- [~iamaleksey] Just added CASSANDRA-8055 Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Fix For: 2.1.1 Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14141190#comment-14141190 ] Aleksey Yeschenko commented on CASSANDRA-7930: -- Apparently switching from its own executor to one of SP's broke all the unit tests by messing with static initialization order. To make all the tests work, now, I switched back to a standalone executor from the v1 patch, in https://github.com/apache/cassandra/commit/488e775cc13044ac1a2b4bd9c4e5d544a4d15bae. [~benedict] If you see an easy way to use SP's here without tangling stuff, feel free commit it in-place. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Fix For: 2.1.1 Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14141197#comment-14141197 ] T Jake Luciani commented on CASSANDRA-7930: --- We should just put that executor in it's own class, ScheduledTaskManager? Then it won't have the init problem. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Fix For: 2.1.1 Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14141201#comment-14141201 ] Aleksey Yeschenko commented on CASSANDRA-7930: -- bq. We should just put that executor in it's own class, ScheduledTaskManager? Then it won't have the init problem. Yup. Maybe go one step further and put all of them somewhere centralized? At least all the executors inside StorageSerive (scheduledTasks, tasks, optionalTasks). *Maybe* other executors too (BatchlogManager, Gossipper, etc.)? Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Fix For: 2.1.1 Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14141311#comment-14141311 ] Benedict commented on CASSANDRA-7930: - I think it would be good practice to move any executor that is shared across classes to a common location anyway. So +1 to doing that. Any executor that's used exclusively _for execution_ by the declaring class should probably stay where it is IMO. So anything that can be made private static should be. Gossiper already fits this bill, and BatchlogManager looks to me like, since it's only accessed externally to shutdown, it should simply have a static shutdown() method exposed that encapsulates this. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Fix For: 2.1.1 Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[
https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135759#comment-14135759
]
Tyler Hobbs commented on CASSANDRA-7930:
Two last minor tweaks and then it should be good to go:
* In the log statement about evicted prepared statements, it should specify
that X statements were discarded _in the last minute_
* Why is {{activePreparedStatements}} incremented in a {{finally}} block? It
should be sufficient to just increment immediately after the {{put()}} call.
Also, the current code doesn't handle duplicate statements being prepared more
than once, but I'll make sure that gets taken care of in CASSANDRA-7923.
Warn when evicting prepared statements from cache
-
Key: CASSANDRA-7930
URL: https://issues.apache.org/jira/browse/CASSANDRA-7930
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Robbie Strickland
Assignee: Robbie Strickland
Labels: bootcamp, jmx
Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt,
cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0.txt,
cassandra-2.1.txt
The prepared statement cache is an LRU, with a max size of maxMemory / 256.
There is currently no warning when statements are evicted, which could be
problematic if the user is unaware that this is happening.
At the very least, we should provide a JMX metric and possibly a log message
indicating this is happening. At some point it may also be worthwhile to
make this tunable for users with large numbers of statements.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135844#comment-14135844 ] Aleksey Yeschenko commented on CASSANDRA-7930: -- This seems to (intentionally?) duplicate a lot of CASSANDRA-7719. So Before committing any of this, I want us to address the issues in my previous comment there - https://issues.apache.org/jira/browse/CASSANDRA-7719?focusedCommentId=14132561page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14132561 Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135855#comment-14135855 ] Robbie Strickland commented on CASSANDRA-7930: -- I simply backported the metrics class to 2.0 so I could add the cache-related stuff, so I'm happy to change as long as it's consistent with whatever you ultimately decide for 2.1. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135895#comment-14135895 ] Tyler Hobbs commented on CASSANDRA-7930: [~iamaleksey] Hmm, I committed this before I saw your request. Perhaps we should make a new ticket to change what you want in 2.0 and 2.1? Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135906#comment-14135906 ] Aleksey Yeschenko commented on CASSANDRA-7930: -- [~thobbs] CASSANDRA-7719 is 2.1.1, so not released yet. I've reopened it instead. This here, I'd just revert it for now. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135981#comment-14135981 ] Aleksey Yeschenko commented on CASSANDRA-7930: -- Okay, now I'm officially confused. EvictedPreparedStatements metric is part of the CASSANDRA-7921 patch, that hasn't been committed yet, but is one day older than this one. How are we backporting something that's not committed yet. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135992#comment-14135992 ] Robbie Strickland commented on CASSANDRA-7930: -- Wow, you're right. This looks like a duplicate of that ticket, just implemented slightly differently. I brought up the issue at boot camp, and it looks like Nate and I both worked on it simultaneously... Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14135998#comment-14135998 ] Tyler Hobbs commented on CASSANDRA-7930: Okay, I reverted the patch for now. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14136006#comment-14136006 ] Aleksey Yeschenko commented on CASSANDRA-7930: -- [~rstrickland] Not entirely. We should still take the logging part from yours. I'll ask for another patch from you for that, once I deal with the rest of the related stuff, if you don't mind doing it. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14136023#comment-14136023 ] Robbie Strickland commented on CASSANDRA-7930: -- Sure, I'll wait until you get things sorted out. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Labels: bootcamp, jmx Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0-v5.txt, cassandra-2.0-v6.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14132970#comment-14132970 ] Tyler Hobbs commented on CASSANDRA-7930: I have a couple of concerns with the patch: * Once the cache is at capacity, the log statement could be triggered very frequently. There's no way for the driver to unprepare a statement. * The warn level is usually reserved for you are (likely) doing something wrong. This could happen under normal circumstances and proper usage. For those reasons, I would move the log statement to debug level. Other than that, this looks good to me. Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Attachments: cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
[jira] [Commented] (CASSANDRA-7930) Warn when evicting prepared statements from cache
[ https://issues.apache.org/jira/browse/CASSANDRA-7930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=14133091#comment-14133091 ] Benedict commented on CASSANDRA-7930: - Please use StorageService.scheduledTasks instead of creating a new executor for such low volume work Warn when evicting prepared statements from cache - Key: CASSANDRA-7930 URL: https://issues.apache.org/jira/browse/CASSANDRA-7930 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Robbie Strickland Assignee: Robbie Strickland Attachments: cassandra-2.0-v2.txt, cassandra-2.0-v3.txt, cassandra-2.0-v4.txt, cassandra-2.0.txt, cassandra-2.1.txt The prepared statement cache is an LRU, with a max size of maxMemory / 256. There is currently no warning when statements are evicted, which could be problematic if the user is unaware that this is happening. At the very least, we should provide a JMX metric and possibly a log message indicating this is happening. At some point it may also be worthwhile to make this tunable for users with large numbers of statements. -- This message was sent by Atlassian JIRA (v6.3.4#6332)
