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https://issues.apache.org/jira/browse/KAFKA-10396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17180897#comment-17180897
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Rohan Desai commented on KAFKA-10396:
-------------------------------------
> I mean to say if my topic going to have 10 Million record then what will be
>the value of Cache and writeBufferManager? and if topic going to have just 5k
>records then what will be the value of Cache and writeBufferManager?
You can try to size your cache/wbm according to the available resources. So if
you have XGB of memory on your system, choose some value significantly less
than of that and allocate that to cache/wbm to bound memory usage from rocksdb.
Remember, even if you choose a cache size that's smaller than it could be, the
os will still cache data for you (it's just a bit more expensive to access it).
So err on the side of choosing something smaller. FWIW we use ~20% of total
memory for the cache (so 6GB out of 30). Then that, plus the size of your java
heap should give you the total memory usage from Java and RocksDB.
> Overall memory of container keep on growing due to kafka stream / rocksdb and
> OOM killed once limit reached
> -----------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-10396
> URL: https://issues.apache.org/jira/browse/KAFKA-10396
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.3.1, 2.5.0
> Reporter: Vagesh Mathapati
> Assignee: Rohan Desai
> Priority: Critical
> Attachments: CustomRocksDBConfig.java, MyStreamProcessor.java,
> kafkaStreamConfig.java
>
>
> We are observing that overall memory of our container keep on growing and
> never came down.
> After analysis find out that rocksdbjni.so is keep on allocating 64M chunks
> of memory off-heap and never releases back. This causes OOM kill after memory
> reaches configured limit.
> We use Kafka stream and globalktable for our many kafka topics.
> Below is our environment
> * Kubernetes cluster
> * openjdk 11.0.7 2020-04-14 LTS
> * OpenJDK Runtime Environment Zulu11.39+16-SA (build 11.0.7+10-LTS)
> * OpenJDK 64-Bit Server VM Zulu11.39+16-SA (build 11.0.7+10-LTS, mixed mode)
> * Springboot 2.3
> * spring-kafka-2.5.0
> * kafka-streams-2.5.0
> * kafka-streams-avro-serde-5.4.0
> * rocksdbjni-5.18.3
> Observed same result with kafka 2.3 version.
> Below is the snippet of our analysis
> from pmap output we took addresses from these 64M allocations (RSS)
> Address Kbytes RSS Dirty Mode Mapping
> 00007f3ce8000000 65536 65532 65532 rw--- [ anon ]
> 00007f3cf4000000 65536 65536 65536 rw--- [ anon ]
> 00007f3d64000000 65536 65536 65536 rw--- [ anon ]
> We tried to match with memory allocation logs enabled with the help of Azul
> systems team.
> @ /tmp/librocksdbjni6564497922441568920.so:
> _Z18rocksdb_get_helperP7JNIEnv_PN7rocksdb2DBERKNS1_11ReadOptionsEPNS1_18ColumnFamilyHandleEP11_jbyteArrayii+0x261)[0x7f3e1c65d741]
> - 0x7f3ce8ff7ca0
> @ /tmp/librocksdbjni6564497922441568920.so:
> _ZN7rocksdb15BlockBasedTable3GetERKNS_11ReadOptionsERKNS_5SliceEPNS_10GetContextEPKNS_14SliceTransformEb+0x894)[0x7f3e1c898fd4]
> - 0x7f3ce8ff9780
> @ /tmp/librocksdbjni6564497922441568920.so:
> _Z18rocksdb_get_helperP7JNIEnv_PN7rocksdb2DBERKNS1_11ReadOptionsEPNS1_18ColumnFamilyHandleEP11_jbyteArrayii+0xfa)[0x7f3e1c65d5da]
> - 0x7f3ce8ff9750
> @ /tmp/librocksdbjni6564497922441568920.so:
> _Z18rocksdb_get_helperP7JNIEnv_PN7rocksdb2DBERKNS1_11ReadOptionsEPNS1_18ColumnFamilyHandleEP11_jbyteArrayii+0x261)[0x7f3e1c65d741]
> - 0x7f3ce8ff97c0
> @
> /tmp/librocksdbjni6564497922441568920.so:_Z18rocksdb_get_helperP7JNIEnv_PN7rocksdb2DBERKNS1_11ReadOptionsEPNS1_18ColumnFamilyHandleEP11_jbyteArrayii+0xfa)[0x7f3e1c65d5da]
> - 0x7f3ce8ffccf0
> @ /tmp/librocksdbjni6564497922441568920.so:
> _Z18rocksdb_get_helperP7JNIEnv_PN7rocksdb2DBERKNS1_11ReadOptionsEPNS1_18ColumnFamilyHandleEP11_jbyteArrayii+0x261)[0x7f3e1c65d741]
> - 0x7f3ce8ffcd10
> @ /tmp/librocksdbjni6564497922441568920.so:
> _Z18rocksdb_get_helperP7JNIEnv_PN7rocksdb2DBERKNS1_11ReadOptionsEPNS1_18ColumnFamilyHandleEP11_jbyteArrayii+0xfa)[0x7f3e1c65d5da]
> - 0x7f3ce8ffccf0
> @ /tmp/librocksdbjni6564497922441568920.so:
> _Z18rocksdb_get_helperP7JNIEnv_PN7rocksdb2DBERKNS1_11ReadOptionsEPNS1_18ColumnFamilyHandleEP11_jbyteArrayii+0x261)[0x7f3e1c65d741]
> - 0x7f3ce8ffcd10
> We also identified that content on this 64M is just 0s and no any data
> present in it.
> I tried to tune the rocksDB configuratino as mentioned but it did not helped.
> [https://docs.confluent.io/current/streams/developer-guide/config-streams.html#streams-developer-guide-rocksdb-config]
>
> Please let me know if you need any more details
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