Building Fault Tolerant Applications.pdf
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Building Fault Tolerant Applications - Nathaniel May, Consulting Engineer @ MongoDB
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Building Fault Tolerant Applications.pdf
- 1. #MDBW17 Nathaniel May Consulting Engineer, MongoDB FAULT TOLERANT APPLICATIONS @codenoodle
- 2. #MDBW17 EXAMPLES ARE FROM REAL BUSINESSES
- 3. #MDBW17 "SERVERS ARE RANDOMLY CRASHING"
- 4. #MDBW17 "SERVERS ARE RANDOMLY CRASHING"
- 5. #MDBW17 "SERVERS ARE RANDOMLY CRASHING"
- 6. #MDBW17 "SERVERS ARE RANDOMLY CRASHING"
- 7. #MDBW17 "SERVERS ARE RANDOMLY CRASHING"
- 8. #MDBW17 "SERVERS ARE RANDOMLY CRASHING"
- 10. #MDBW17 TOPICS
- 11. #MDBW17 TOPICS
- 12. #MDBW17 TOPICS 1
- 28. #MDBW17 SCALING
- 32. #MDBW17 TAKEAWAY
- 33. #MDBW17 SLOW QUERIES & TIMEOUTS
- 35. #MDBW17 SOCKET TIMEOUT BROKEN SOCKET SOCKET TIMEOUT result set poorly formed query
- 36. #MDBW17 SOCKET TIMEOUT BROKEN SOCKET SOCKET TIMEOUT result set poorly formed query
- 37. #MDBW17 SOCKET TIMEOUT BROKEN SOCKET SOCKET TIMEOUT result set poorly formed query
- 38. #MDBW17 SOCKET TIMEOUT WITH MAXTIMEMS
- 39. #MDBW17 SOCKET TIMEOUT WITHOUT MAXTIMEMS BROKEN SOCKET SOCKET TIMEOUT result set poorly formed query MAXTIMEMS NO WASTED RESOURCES
- 40. #MDBW17 SOCKET TIMEOUT WITHOUT MAXTIMEMS BROKEN SOCKET SOCKET TIMEOUT result set poorly formed query NO WASTED RESOURCES
- 41. #MDBW17 SOCKET TIMEOUT WITHOUT MAXTIMEMS BROKEN SOCKET SOCKET TIMEOUT result set poorly formed query MAXTIMEMS NO WASTED RESOURCES
- 42. #MDBW17 SOCKET TIMEOUT WITHOUT MAXTIMEMS BROKEN SOCKET SOCKET TIMEOUT result set poorly formed query MAXTIMEMS NO WASTED RESOURCES
- 45. #MDBW17 TAKEAWAY
- 47. #MDBW17 WHAT KIND OF FAULTS ARE WE TOLERATING? Primary Failover Network Blip Network Down
- 48. #MDBW17 …AND THE DEVELOPER’S FAULT
- 49. #MDBW17 WHAT KIND OF FAULTS ARE WE TOLERATING? Primary Failover Network Blip Network Down
- 50. #MDBW17 WHAT KIND OF FAULTS ARE WE TOLERATING? Network Error Network Blip Network Down
- 51. #MDBW17 WHAT KIND OF FAULTS ARE WE TOLERATING? Network Error Network Error Network Down
- 52. #MDBW17 WHAT KIND OF FAULTS ARE WE TOLERATING? Network Error Network Error Network Error
- 53. #MDBW17 DRIVER BEHAVIOR AFTER NETWORK ERROR
- 54. #MDBW17 DRIVER BEHAVIOR AFTER NETWORK ERROR NO PRIMARY {operation} {app retry} {auto discovery} {auto discovery} NO PRIMARY NO PRIMARY PRIMARY
- 55. #MDBW17 DRIVER BEHAVIOR AFTER NETWORK ERROR NO PRIMARY {operation} {app retry} {auto discovery} {auto discovery} NO PRIMARY NO PRIMARY PRIMARY
- 56. #MDBW17 DRIVER BEHAVIOR AFTER NETWORK ERROR NO PRIMARY {operation} {app retry} {auto discovery} {auto discovery} NO PRIMARY NO PRIMARY PRIMARY
- 57. #MDBW17 DRIVER BEHAVIOR AFTER NETWORK ERROR NO PRIMARY {operation} {app retry} {auto discovery} {auto discovery} NO PRIMARY NO PRIMARY PRIMARY
- 60. #MDBW17 RETRY STRATEGIES DON'T RETRY RETRY N TIMES
- 61. #MDBW17 RETRY STRATEGIES DON'T RETRY RETRY N TIMES EXPONENTIAL BACKOFF
- 62. #MDBW17 RETRY STRATEGIES DON'T RETRY RETRY N TIMES EXPONENTIAL BACKOFF RETRY EXACTLY ONCE
- 63. #MDBW17 RETRY STRATEGIES DON'T RETRY RETRY N TIMES EXPONENTIAL BACKOFF RETRY EXACTLY ONCE
- 64. #MDBW17 RETRY EXACTLY ONCE Query Insert Remove Update Operations Primary Failover Network Blip Network Down
- 76. #MDBW17 RETRY EXACTLY ONCE Query Insert Remove Update Operations Primary Failover Network Blip Network Down
- 77. #MDBW17 RETRY EXACTLY ONCE Query CORRECT Insert Remove Update Operations Primary Failover Network Blip Network Down
- 78. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT Insert Remove Update Operations Primary Failover Network Blip Network Down
- 79. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert Remove Update Operations Primary Failover Network Blip Network Down
- 80. #MDBW17 INSERT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} SOCKET TIMEOUT BLIP SINGLE INSERT
- 81. #MDBW17 INSERT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} SOCKET TIMEOUT BLIP SINGLE INSERT
- 82. #MDBW17 INSERT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} SOCKET TIMEOUT BLIP SINGLE INSERT
- 83. #MDBW17 INSERT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} SOCKET TIMEOUT BLIP SINGLE INSERT
- 84. #MDBW17 INSERT
- 85. #MDBW17 INSERT BLIP SOCKET TIMEOUT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"}
- 86. #MDBW17 INSERT BLIP SOCKET TIMEOUT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"}
- 87. #MDBW17 INSERT BLIP SOCKET TIMEOUT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"}
- 88. #MDBW17 INSERT BLIP SOCKET TIMEOUT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"}
- 89. #MDBW17 INSERT BLIP SOCKET TIMEOUT {name: "MongoDB"} {name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} {_id: ObjectId(), name: "MongoDB"} DUPLICATEDATA
- 91. #MDBW17 INSERT WITH _ID BLIP SOCKET TIMEOUT {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} DUPLICATEKEY ERROR – SINGLE INSERT
- 92. #MDBW17 INSERT WITH _ID BLIP SOCKET TIMEOUT {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} DUPLICATEKEY ERROR – SINGLE INSERT
- 93. #MDBW17 INSERT WITH _ID BLIP SOCKET TIMEOUT {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} DUPLICATEKEY ERROR – SINGLE INSERT
- 94. #MDBW17 INSERT WITH _ID BLIP SOCKET TIMEOUT {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} DUPLICATEKEY ERROR – SINGLE INSERT
- 95. #MDBW17 INSERT WITH _ID BLIP SOCKET TIMEOUT {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} {_id: 1, name: "MongoDB"} DUPLICATEKEY ERROR – SINGLE INSERT
- 96. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert Remove Update Operations Primary Failover Network Blip Network Down
- 97. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT Remove Update Operations Primary Failover Network Blip Network Down
- 98. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT Remove Update Operations Primary Failover Network Blip Network Down
- 99. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove Update Operations Primary Failover Network Blip Network Down
- 100. #MDBW17 REMOVE
- 104. #MDBW17 REMOVE deleteOne ({a:1}) deleteMany({a:1}) deleteMany({ts: {$lt: today_midnight}})
- 105. #MDBW17 REMOVE deleteOne ({a:1}) deleteMany({a:1}) deleteMany({ts: {$lt: today_midnight}}) deleteOne ({_id: 1})
- 106. #MDBW17 REMOVE deleteOne ({a:1}) deleteMany({a:1}) deleteMany({ts: {$lt: today_midnight}}) deleteOne ({_id: 1}) deleteMany({_id: {$in: [1, 2, 3]}})
- 107. #MDBW17 REMOVE deleteOne ({a:1}) deleteMany({a:1}) deleteMany({ts: {$lt: today_midnight}}) deleteOne ({_id: 1}) deleteMany({_id: {$in: [1, 2, 3]}})
- 108. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove Update Operations Primary Failover Network Blip Network Down
- 109. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove CORRECT Update Operations Primary Failover Network Blip Network Down
- 110. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove CORRECT CORRECT Update Operations Primary Failover Network Blip Network Down
- 111. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove CORRECT CORRECT CORRECT Update Operations Primary Failover Network Blip Network Down
- 112. #MDBW17 UPDATE
- 113. #MDBW17 UPDATE {$inc: {count: 1}} {$inc: {count: 1}} SOCKET TIMEOUT BLIP CORRECT COUNT {_id: 1, count: 1} {_id: 1, count: 1} {_id: 1, count: 2}
- 114. #MDBW17 UPDATE {$inc: {count: 1}} {$inc: {count: 1}} SOCKET TIMEOUT BLIP CORRECT COUNT {_id: 1, count: 1} {_id: 1, count: 1} {_id: 1, count: 2}
- 115. #MDBW17 UPDATE {$inc: {count: 1}} {$inc: {count: 1}} SOCKET TIMEOUT BLIP {_id: 1, count: 1} {_id: 1, count: 1} {_id: 1, count: 2}
- 116. #MDBW17 UPDATE {$inc: {count: 1}} {$inc: {count: 1}} SOCKET TIMEOUT BLIP CORRECT COUNT {_id: 1, count: 1} {_id: 1, count: 1} {_id: 1, count: 2}
- 117. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} OVER COUNT! {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 118. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} OVER COUNT! {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 119. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} OVER COUNT! {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 120. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} OVER COUNT! {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 121. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 122. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} OVER COUNT! {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 123. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove CORRECT CORRECT CORRECT Update OVER COUNT? Operations Primary Failover Network Blip Network Down
- 124. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove CORRECT CORRECT CORRECT Update OVER COUNT? OVER COUNT? Operations Primary Failover Network Blip Network Down
- 125. #MDBW17 RETRY EXACTLY ONCE Query CORRECT CORRECT CORRECT Insert CORRECT CORRECT CORRECT Remove CORRECT CORRECT CORRECT Update OVER COUNT? OVER COUNT? CORRECT Operations Primary Failover Network Blip Network Down
- 126. #MDBW17 TRANSACTIONS
- 130. #MDBW17 NOT IDEMPOTENT Discard 2 cards
- 132. #MDBW17 NOT IDEMPOTENT Discard 2 cards
- 134. #MDBW17 NOT IDEMPOTENT Discard 2 cards
- 136. #MDBW17 NOT IDEMPOTENT The number of cards changed every time
- 137. #MDBW17 IDEMPOTENT
- 138. #MDBW17 IDEMPOTENT
- 140. #MDBW17 IDEMPOTENT Discard down to 4 cards
- 141. #MDBW17 IDEMPOTENT
- 142. #MDBW17 IDEMPOTENT Discard down to 4 cards
- 144. #MDBW17 IDEMPOTENT The number of cards only changed once
- 145. #MDBW17 IDEMPOTENT The number of cards only changed once 1
- 147. #MDBW17 THE IDEMPOTENT UPDATE opid = new ObjectId(); db.col.updateOne( {_id: ObjectId("…"), update_ops: {$ne: opid} }, {$inc: {count: 1}, $push: {update_ops: opid} } );
- 148. #MDBW17 THE IDEMPOTENT UPDATE opid = new ObjectId(); db.col.updateOne( {_id: ObjectId("…"), update_ops: {$ne: opid} }, {$inc: {count: 1}, $push: {update_ops: opid} } );
- 151. #MDBW17 OBJECTID( ) ObjectId("507f1f77XXXXXXXXXXXXXXXX") 4 bytes – seconds since Unix epoch
- 152. #MDBW17 OBJECTID( ) ObjectId("507f1f77bcf86cXXXXXXXXXX") 4 bytes – seconds since Unix epoch 3 bytes – hashed machine identifier
- 153. #MDBW17 OBJECTID( ) ObjectId("507f1f77bcf86cd799XXXXXX") 4 bytes – seconds since Unix epoch 3 bytes – hashed machine identifier 2 bytes – hashed process id
- 154. #MDBW17 OBJECTID( ) ObjectId("507f1f77bcf86cd799439011") 4 bytes – seconds since Unix epoch 3 bytes – hashed machine identifier 2 bytes – hashed process id 3 bytes – counter
- 155. #MDBW17 THE IDEMPOTENT UPDATE opid = new ObjectId(); db.col.updateOne( {_id: "…", update_ops: {$ne: opid} }, {$inc: {count: 1}, $push: {update_ops: opid} } );
- 156. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}});
- 157. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}});
- 158. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 1 }
- 159. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 1 }
- 160. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 1 }
- 161. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 1 }
- 162. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 1 }
- 163. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 2, update_ops: [ ObjectId("x") ] }
- 164. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} OVER COUNT! {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 165. #MDBW17 UPDATE BLIP SOCKET TIMEOUT {$inc: {count: 1}} OVER COUNT! {$inc: {count: 1}} {_id: 1, count: 1} {_id: 1, count: 2} {_id: 1, count: 2} {_id: 1, count: 3}
- 166. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 2, update_ops: [ ObjectId("x") ] }
- 167. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 2, update_ops: [ ObjectId("x") ] }
- 168. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 2, update_ops: [ ObjectId("x") ] }
- 169. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 2, update_ops: [ ObjectId("x") ] }
- 170. #MDBW17 THE IDEMPOTENT UPDATE TRY: opid = new ObjectId(); db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); CATCH: db.col.updateOne( {_id: "ABC", update_ops: {$ne: opid}}, {$inc: {count: 1}, $push: {update_ops: opid}}); { _id: "ABC", count: 2, update_ops: [ ObjectId("x") ] }
- 171. #MDBW17 CLEANUP
- 172. #MDBW17 CLEANUP { _id: "ABC", count: 3, update_ops: [ ObjectId("…"), ObjectId("…") ] }
- 173. #MDBW17 CLEANUP { _id: "ABC", count: 4, update_ops: [ ObjectId("…"), ObjectId("…"), ObjectId("…") ] }
- 174. #MDBW17 CLEANUP { _id: "ABC", count: 5, update_ops: [ ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…") ] }
- 175. #MDBW17 CLEANUP { _id: "ABC", count: 6, update_ops: [ ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…") ] }
- 176. #MDBW17 CLEANUP { _id: "ABC", count: 7, update_ops: [ ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…") ] }
- 177. #MDBW17 CLEANUP { _id: "ABC", count: 9, update_ops: [ ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…") ] }
- 178. #MDBW17 CLEANUP { _id: "ABC", count: 13, update_ops: [ ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…"), ObjectId("…") ] }
- 179. #MDBW17 CLEANUP
- 181. #MDBW17 CLEANUP IMMEDIATE SECOND UPDATE ASYNCRONOUS BATCH PROCESS
- 182. #MDBW17 CLEANUP IMMEDIATE SECOND UPDATE ASYNCRONOUS BATCH PROCESS TAIL THE OPLOG
- 183. #MDBW17 CLEANUP IMMEDIATE SECOND UPDATE ASYNCRONOUS BATCH PROCESS TAIL THE OPLOG $SLICE DURING UPDATE
- 184. #MDBW17 CLEANUP IMMEDIATE SECOND UPDATE ASYNCRONOUS BATCH PROCESS TAIL THE OPLOG $SLICE DURING UPDATE
- 185. #MDBW17 CLEANUP WITH $SLICE opid = new ObjectId(); db.col.updateOne( {_id: ObjectId("…"), update_ops: {$ne: opid} }, {$inc: {count: 1}, $push: {update_ops: {$each: [opid], $slice: -10 }}} );
- 186. #MDBW17 CLEANUP WITH $SLICE opid = new ObjectId(); db.col.updateOne( {_id: ObjectId("…"), update_ops: {$ne: opid} }, {$inc: {count: 1}, $push: {update_ops: {$each: [opid], $slice: -10 }}} );
- 187. #MDBW17 TAKEAWAYS
- 188. #MDBW17 TAKEAWAYS
- 189. #MDBW17 TAKEAWAYS
- 190. #MDBW17 TAKEAWAYS 1