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For a good portion of today, SoylentNews was generating 503 errors if you either logged in or tried to post a comment. While not 100% consistent, the underlying problem is that the design of MySQL cluster requires us to manually allocate space for indexes and data storage. Today, the index storage maxed out, and MySQL refused to insert new rows stating "Table 'name' is full".
We've doubled the size of the IndexMemory which should solve this issue in the short term. Longer term, we need to migrate some data to reside permanently on HDD storage. If anyone has experience with MySQL Cluster and can offer suggestions, we're all ears.
Here's our current memory usage on the cluster for those who are interested:
ndb_mgm> all report memoryusage Node 2: Data usage is 81%(53650 32K pages of total 65536) Node 2: Index usage is 46%(15407 8K pages of total 32800) Node 3: Data usage is 81%(53648 32K pages of total 65536) Node 3: Index usage is 46%(15407 8K pages of total 32800)
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If bankers can count, how come they have eight windows and only four tellers?
(Score: 3, Informative) by NCommander on Saturday August 08 2015, @01:12AM
The database layer in rehash (the codebase that powers the site) is abstracted so changing database engines is possible, but its all handwritten SQL. aka, serious effort to change, but not impossible.
Still always moving
(Score: 2) by jdavidb on Saturday August 08 2015, @03:13AM
ⓋⒶ☮✝🕊 Secession is the right of all sentient beings