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https://issues.apache.org/jira/browse/CASSANDRA-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149861#comment-13149861
]
Mck SembWever commented on CASSANDRA-3427:
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startup log with debug{noformat}INFO 48:34,688 DatabaseDescriptor: Loading
settings from file:/iad/finn/countstatistics/conf/cassandra-prod.yaml
INFO 48:34,782 DatabaseDescriptor: DiskAccessMode 'auto' determined to be
mmap, indexAccessMode is mmap
INFO 48:34,792 DatabaseDescriptor: Global memtable threshold is enabled at
512MB
INFO 48:34,890 AbstractCassandraDaemon: JVM vendor/version: Java HotSpot(TM)
64-Bit Server VM/1.6.0_24
INFO 48:34,891 AbstractCassandraDaemon: Heap size: 760414208/8506048512
INFO 48:34,891 AbstractCassandraDaemon: Classpath:
/iad/finn/countstatistics/jar/countstatistics.jar:/iad/common/apps/cassandra/lib/jamm-0.2.5.jar
INFO 48:37,158 CLibrary: JNA mlockall successful
INFO 48:37,879 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/Versions-h-42 (256 bytes)
INFO 48:37,879 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/Versions-h-41 (256 bytes)
INFO 48:37,879 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/Versions-h-40 (256 bytes)
INFO 48:37,959 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/IndexInfo-h-3 (223 bytes)
INFO 48:38,001 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/Schema-h-15 (34257 bytes)
INFO 48:38,045 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/Migrations-h-15 (78524 bytes)
INFO 48:38,096 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/LocationInfo-h-150 (80 bytes)
INFO 48:38,096 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/LocationInfo-h-149 (628 bytes)
INFO 48:38,096 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/system/LocationInfo-h-151 (163 bytes)
INFO 48:38,192 DatabaseDescriptor: Loading schema version
1940c630-0be4-11e1-0000-d1695892b1ff
INFO 51:35,136 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191473
(38646535 bytes)
INFO 51:35,136 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-190467
(2284524668 bytes)
INFO 51:35,136 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191469
(254927460 bytes)
INFO 51:35,136 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191475
(30477008 bytes)
INFO 51:35,136 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-114136
(156044360682 bytes)
INFO 51:35,137 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191294
(4585008988 bytes)
INFO 51:35,137 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-190415
(15857295280 bytes)
INFO 51:35,137 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-183183
(196289440978 bytes)
INFO 51:35,137 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191472
(1346076 bytes)
INFO 51:35,137 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-190736
(4626053255 bytes)
INFO 51:35,137 SSTableReader: Opening
/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191435
(1188223188 bytes)
INFO 51:35,187 CompressionMetadata: Allocating chunks index for 5745 chunks
for uncompressed size of 1470519
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191472-CompressionInfo.db)
INFO 51:35,421 CompressionMetadata: Allocating chunks index for 129646 chunks
for uncompressed size of 33189311
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191475-CompressionInfo.db)
INFO 51:35,544 CompressionMetadata: Allocating chunks index for 165602 chunks
for uncompressed size of 42393918
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191473-CompressionInfo.db)
INFO 51:37,171 CompressionMetadata: Allocating chunks index for 1091377 chunks
for uncompressed size of 279392485
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191469-CompressionInfo.db)
INFO 51:41,148 CompressionMetadata: Allocating chunks index for 5086138 chunks
for uncompressed size of 1302051278
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191435-CompressionInfo.db)
INFO 51:46,351 CompressionMetadata: Allocating chunks index for 9766541 chunks
for uncompressed size of 2500234376
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-190467-CompressionInfo.db)
INFO 51:56,717 CompressionMetadata: Allocating chunks index for 19828434
chunks for uncompressed size of 5076078986
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-190736-CompressionInfo.db)
INFO 51:56,897 CompressionMetadata: Allocating chunks index for 19626358
chunks for uncompressed size of 5024347477
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-191294-CompressionInfo.db)
INFO 52:21,670 CompressionMetadata: Allocating chunks index for 67865822
chunks for uncompressed size of 17373650297
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-190415-CompressionInfo.db)
INFO 55:55,920 CompressionMetadata: Allocating chunks index for 666981588
chunks for uncompressed size of 170747286320
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-114136-CompressionInfo.db)
INFO 56:49,620 CompressionMetadata: Allocating chunks index for 840404671
chunks for uncompressed size of 215143595584
(/iad/finn/countstatistics/cassandra-data/countstatisticsCount/thrift_no_finntech_countstats_count_Count_neg8589045746818385983-h-183183-CompressionInfo.db)
ERROR 57:51,112 AbstractCassandraDaemon: Fatal exception in thread
Thread[SSTableBatchOpen:8,5,main]
java.lang.OutOfMemoryError: Java heap space
at org.apache.cassandra.utils.BigLongArray.<init>(BigLongArray.java:53)
at org.apache.cassandra.utils.BigLongArray.<init>(BigLongArray.java:39)
at
org.apache.cassandra.io.compress.CompressionMetadata.readChunkOffsets(CompressionMetadata.java:127)
...{noformat}
> CompressionMetadata is not shared across threads, we create a new one for
> each read
> -----------------------------------------------------------------------------------
>
> Key: CASSANDRA-3427
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3427
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.0
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Labels: compression
> Fix For: 1.0.2
>
> Attachments: 0001-debugging.patch, 3427.patch, 3427_v2.patch,
> CASSANDRA-3427.patch, jmx_jvm_memory-month.png, jmx_jvm_memory-week.png
>
>
> The CompressionMetada holds the compressed block offsets in memory. Without
> being absolutely huge, this is still of non-negligible size as soon as you
> have a bit of data in the DB. Reallocating this for each read is a very bad
> idea.
> Note that this only affect range queries, since "normal" queries uses
> CompressedSegmentedFile that does reuse a unique CompressionMetadata instance.
> ( Background: http://thread.gmane.org/gmane.comp.db.cassandra.user/21362 )
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