Hi Naman,
To be honest, in case of allow filtering ... you can expect Langer processing
time and you cannot keep SLA. Can you use indexes and remove allow filtering?
NOTE: you can use SAI in version 5
Regards
Jiri
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Od: Naman kaushik <[email protected]>
Odesláno: čtvrtek, října 24, 2024 6:26:27 dop.
Komu: [email protected] <[email protected]>
Předmět: [External]Cross-Node Latency Issues
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Hello everyone,
We are currently using Cassandra 4.1.3 in a two-data-center cluster. Recently,
we observed cross-node latency spikes of 3-4 seconds in one of our data
centers. Below are the relevant logs from all three nodes in this DC:
DEBUG [ScheduledTasks:1] 2024-10-20 02:46:43,164 MonitoringTask.java:174 - 413
operations were slow in the last 5001 msecs:
<SELECT ItemDetails, ItemDocuments, ItemISQDetails, ItemMappings, LastModified,
ItemImages, ItemTitles, ItemCategories, ItemRating, ApprovalStatus, LocalName,
UserIdentifier, IsDisplayed, VariantOptions FROM product_data.item_table WHERE
item_table_display_id = 2854462277448 LIMIT 5000 ALLOW FILTERING>, time 3400
msec - slow timeout 500 msec
<SELECT AlternateMasterCategoryData, MasterCategoryData, MasterGroupData,
MasterSubCategoryData, MasterParentCategoryData FROM
product_data.taxonomy_table WHERE master_id = 6402 LIMIT 5000 ALLOW FILTERING>,
time 2309 msec - slow timeout 500 msec/cross-node
<SELECT ItemDetails, ItemDocuments, ItemISQDetails, ItemMappings, LastModified,
ItemImages, ItemTitles, ItemCategories, ItemRating, ApprovalStatus, LocalName,
UserIdentifier, IsDisplayed, VariantOptions FROM product_data.item_table WHERE
item_table_display_id = 24279823548 LIMIT 5000 ALLOW FILTERING>, time 3287 msec
- slow timeout 500 msec/cross-node
<SELECT ItemDetails, ItemDocuments, ItemISQDetails, ItemMappings, LastModified,
ItemImages, ItemTitles, ItemCategories, ItemRating,
ApprovalStatus, LocalName, UserIdentifier, IsDisplayed, VariantOptions FROM
product_data.item_table WHERE item_table_display_id = 2854486264330 LIMIT 5000
ALLOW FILTERING>, time 2878 msec - slow timeout 500 msec/cross-node
<SELECT AlternateMasterCategoryData, MasterCategoryData, MasterGroupData,
MasterSubCategoryData, MasterParentCategoryData FROM
product_data.taxonomy_table WHERE master_id = 27245 LIMIT 5000 ALLOW
FILTERING>, time 3056 msec - slow timeout 500 msec/cross-node
<SELECT AlternateMasterCategoryData, MasterCategoryData, MasterGroupData,
MasterSubCategoryData, MasterParentCategoryData FROM
product_data.taxonomy_table WHERE master_id = 32856 LIMIT 5000 ALLOW
FILTERING>, time 2353 msec - slow timeout 500 msec/cross-node
<SELECT AlternateMasterCategoryData, MasterCategoryData, MasterGroupData,
MasterSubCategoryData, MasterParentCategoryData FROM
product_data.taxonomy_table WHERE master_id = 95589 LIMIT 5000 ALLOW
FILTERING>, time 2224 msec - slow timeout 500 msec/cross-node
<SELECT ItemDetails, ItemDocuments, ItemISQDetails, ItemMappings, LastModified,
ItemImages, ItemTitles, ItemCategories, ItemRating, ApprovalStatus, LocalName,
UserIdentifier, IsDisplayed, VariantOptions FROM product_data.item_table WHERE
item_table_display_id = 2854514159012 LIMIT 5000 ALLOW FILTERING>, time 3396
msec - slow timeout 500 msec
Upon investigation, we found no GC pauses at the time of the latency, and CPU
and memory utilization across all nodes appeared normal. Additionally, latency
metrics from Grafana also showed standard performance.
Given these observations, we are trying to identify the potential causes of
this latency. Any insights or suggestions from the community would be greatly
appreciated!
Thank you!
