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From "Andrey Lataev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13937) Cassandra node's startup time increased after increase count of big tables
Date Tue, 10 Oct 2017 15:42:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198850#comment-16198850
] 

Andrey Lataev commented on CASSANDRA-13937:
-------------------------------------------


I try to replace LCS on STCS but without significant result.

>  Cassandra node's startup time increased after increase count of big tables
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-13937
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13937
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: RHEL 7.3
> JDK HotSpot 1.8.0_121-b13
> cassandra-3.11 cluster with 43 nodes in 9 datacenters
> 8vCPU, 100 GB RAM
>            Reporter: Andrey Lataev
>         Attachments: cassandra.zip, debug.zip
>
>
> In startup time Cassandra spends a long time on read some big Columnfamilies.
> For example, in debug.log:
> {code:java}
> grep SSTableReader.java:506 /var/log/cassandra/debug.log
> <...> 
> DEBUG [SSTableBatchOpen:3] 2017-10-04 22:40:05,297 SSTableReader.java:506 - Opening /egov/data/cassandra/datafiles1/p00smevauditbody/messagelogbody20171003-b341cc709c7511e7b1cfed1e90eb03dc/mc-45242-big
(19.280MiB)
> DEBUG [SSTableBatchOpen:5] 2017-10-04 22:42:14,188 SSTableReader.java:506 - Opening /egov/data/cassandra/datafiles1/p00smevauditbody/messagelogbody20171004-f82225509d3e11e7b1cfed1e90eb03dc/mc-49002-big
(10.607MiB)
> <...>
> DEBUG [SSTableBatchOpen:4] 2017-10-04 22:42:19,792 SSTableReader.java:506 - Opening /egov/data/cassandra/datafiles1/p00smevauditbody/messagelogbody20171004-f82225509d3e11e7b1cfed1e90eb03dc/mc-47907-big
(128.172MiB)
> DEBUG [SSTableBatchOpen:1] 2017-10-04 22:44:23,560 SSTableReader.java:506 - Opening /egov/data/cassandra/datafiles1/pk4smevauditbody/messagelogbody20170324-f918bfa0107b11e7adfc2d0b45a372ac/mc-4-big
(96.310MiB)
> <..>
> {code}
> SSTableReader.java:506 spent ~ 2 min per every big table in p00smevauditbody keyspace.
> I was planned too keep similar tables for the full month...
> So it seems like Cassandra will need more then 1h on startup...
> Does it available to speed up SSTableBatchOpen ?



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