Major Description
1. For our business, we need to write any taken signal into kudu, so the load is very hight. We decide to use spark stream will kudu client to fulfill this task. the code like below:
val kuduContext = new KuduContext("KuduMaster", trackRdd.sparkContext) ........ kuduContext.upsertRows(trackRdd, saveTable)
2. check spark log
2019-01-30 16:09:31 WARN TaskSetManager:66 - Lost task 0.0 in stage 38855.0 (TID 25499, 192.168.33.158, executor 2): java.lang.RuntimeException: failed to write 1000 rows from DataFrame to Kudu; sample errors: Timed out: can not complete before timeout: Batch{operations=58, tablet="41f47fabf6964719befd06ad01bc133b" [0x000000088000016804FE4
800, 0x0000000880000168A4A36BFF), ignoreAllDuplicateRows=false, rpc=KuduRpc(method=Write, tablet=41f47fabf6964719befd06ad01bc133b, attempt=42, DeadlineTracker(timeout=3000
0, elapsed=29675), Traces: [0ms] querying master,
[0ms] Sub rpc: GetTableLocations sending RPC to server master-192.168.33.152:7051,
[3ms] Sub rpc: GetTableLocations received from server master-192.168.33.152:7051 response OK,
[3ms] sending RPC to server a33504d2e2fc4447aa054f2589b9f9ae,
[6ms] delaying RPC due to Illegal state: Replica a33504d2e2fc4447aa054f2589b9f9ae is not leader of this config. Role: FOLLOWER. Consensus state: current_term: 1639 committed_config { opid_index: 135 OBSOLETE_local: false peers { permanent_uuid: "a33504d2e2fc4447aa054f2589b9f9ae" member_type: VOTER last_known_addr { host: "cm07" port: 7050 } } peers { permanent_uuid: "083ef4d758854ddd9f4d15a3c718fe4b" member_type: VOTER last_known_addr { host: "cm04" port: 7050 } } peers { permanent_uuid: "cbc554095f1f4ef5b6442da45a542ac3" member_type: VOTER last_known_addr { host: "cm02" port: 7050 } } } (error 0),
[6ms] received from server a33504d2e2fc4447aa054f2589b9f9ae response Illegal state: Replica a33504d2e2fc4447aa054f2589b9f9ae is not leader of this config. Role: FOLLOWER. Consensus state: current_term: 1639 committed_config { opid_index: 135 OBSOLETE_local: false peers { permanent_uuid: "a33504d2e2fc4447aa054f2589b9f9ae" member_type: VOTER last_known_addr { host: "cm07" port: 7050 } } peers { permanent_uuid: "083ef4d758854ddd9f4d15a3c718fe4b" member_type: VOTER last_known_addr { host: "cm04" port: 7050 } } peers { permanent_uuid: "cbc554095f1f4ef5b6442da45a542ac3" member_type: VOTER last_known_addr { host: "cm02" port: 7050 } } } (error0),
.....................
[793ms] querying master,
[793ms] Sub rpc: GetTableLocations sending RPC to server master-192.168.33.152:7051,
[795ms] Sub rpc: GetTableLocations received from server master-192.168.33.152:7051 response OK,
[796ms] sending RPC to server a33504d2e2fc4447aa054f2589b9f9ae,
[798ms] delaying RPC due to Illegal state: Replica a33504d2e2fc4447aa054f2589b9f9ae is not leader of this config. Role: FOLLOWER. Consensus state: current_term: 1639 committed_config { opid_index: 135 OBSOLETE_local: false peers { permanent_uuid: "a33504d2e2fc4447aa054f2589b9f9ae" member_type: VOTER last_known_addr { host: "cm07" port: 7050 } } peers { permanent_uuid: "083ef4d758854ddd9f4d15a3c718fe4b" member_type: VOTER last_known_addr { host: "cm04" port: 7050 } } peers { permanent_uuid: "cbc554095f1f4ef5b6442da45a542ac3" member_type: VOTER last_known_addr { host: "cm02" port: 7050 } } } (error 0),
[799ms] received from server a33504d2e2fc4447aa054f2589b9f9ae response Illegal state: Replica a33504d2e2fc4447aa054f2589b9f9ae is not leader of this config. Role: FOLLOWER. Consensus state: current_term: 1639 committed_config { opid_index: 135 OBSOLETE_local: false peers { permanent_uuid: "a33504d2e2fc4447aa054f2589b9f9ae" member_type: VOTER last_known_addr { host: "cm07" port: 7050 } } peers { permanent_uuid: "083ef4d758854ddd9f4d15a3c718fe4b" member_type: VOTER last_known_addr { host: "cm04" port: 7050 } } peers { permanent_uuid: "cbc554095f1f4ef5b6442da45a542ac3" member_type: VOTER last_known_addr { host: "cm02" port: 7050 } } } (error 0),
[3552ms] querying master,
[3552ms] Sub rpc: GetTableLocations sending RPC to server master-192.168.33.152:7051,
[3553ms] Sub rpc: GetTableLocations received from server master-192.168.33.152:7051 response OK,
[3553ms] sending RPC to server a33504d2e2fc4447aa054f2589b9f9ae,
[3556ms] delaying RPC due to Illegal state: Replica a33504d2e2fc4447aa054f2589b9f9ae is not leader of this config. Role: FOLLOWER. Consensus state: current_term: 1639 committed_config { opid_index: 135 OBSOLETE_local: false peers { permanent_uuid: "a33504d2e2fc4447aa054f2589b9f9ae" member_type: VOTER last_known_addr { host: "cm07" port: 7050 } } peers { permanent_uuid: "083ef4d758854ddd9f4d15a3c718fe4b" member_type: VOTER last_known_addr { host: "cm04" port: 7050 } } p
get the same issue like [KUDU-2329
3. Then use kudu cluster ksck to check staus find some tablet unavailable
Tablet bb7aff8f0d79458ebd263b57e7ed2848 of table 'impala::flyway.track_2018' is under-replicated: 1 replica(s) not RUNNING a9efdf1d4c5d4bfd933876c2c9681e83 (cm01:7050): RUNNING afba5bc65a93472683cb613a7c693b0f (cm03:7050): TS unavailable [LEADER] 4a00d2312d5042eeb41a1da0cc264213 (cm02:7050): RUNNING All reported replicas are: A = a9efdf1d4c5d4bfd933876c2c9681e83 B = afba5bc65a93472683cb613a7c693b0f C = 4a00d2312d5042eeb41a1da0cc264213 The consensus matrix is: Config source | Replicas | Current term | Config index | Committed? ---------------+------------------------+--------------+--------------+------------ master | A B* C | | | Yes A | A B* C | 25 | -1 | Yes B | [config not available] | | | C | A B* C | 25 | -1 | Yes Tablet 82e89518366840aaa3f8bd426818e001 of table 'impala::flyway.track_2017' is under-replicated: 1 replica(s) not RUNNING afba5bc65a93472683cb613a7c693b0f (cm03:7050): TS unavailable [LEADER] 4a00d2312d5042eeb41a1da0cc264213 (cm02:7050): RUNNING a9efdf1d4c5d4bfd933876c2c9681e83 (cm01:7050): RUNNING All reported replicas are: A = afba5bc65a93472683cb613a7c693b0f B = 4a00d2312d5042eeb41a1da0cc264213 C = a9efdf1d4c5d4bfd933876c2c9681e83 The consensus matrix is: Config source | Replicas | Current term | Config index | Committed? ---------------+------------------------+--------------+--------------+------------ master | A* B C | | | Yes A | [config not available] | | | B | A* B C | 29 | -1 | Yes C | A B C | 28 | -1 | Yes .......................................... The relative table is CONSENSUS_MISMATCH like Name | RF | Status | Total Tablets | Healthy | Recovering | Under-replicated | Unavailable -----------------------------------------------------+----+--------------- impala::flyway.track_2017 | 3 | CONSENSUS_MISMATCH | 120 | 60 | 0 | 56 | 4 impala::flyway.track_2018 | 3 | CONSENSUS_MISMATCH | 120 | 60 | 0 | 56 | 4
For not leader available, the spark is stuck for long time, then data lost. We find the status of some tables is "CONSENSUS_MISMATCH" randomly then recover [*HEALTHY*] after a while, leaders of some tablets are unavailable. All operation are in a LAN, network and machines work fine, each tablet server own 1500 tablets, the recommended values is 1000 tablets .
By the way, I have a question about voting processing, each tablet seems to have an individual vote process, then does need thousands of individual voting processing if has thousands of tablets? Something optimized can do if yes?
Thanks.
