"Unable to rollback transaction" Neo4j 中的错误

Question

我正在尝试运行以下查询以从我拥有的 .csv 文件创建我的节点和关系：

USING PERIODIC COMMIT 1000 LOAD CSV WITH HEADERS FROM 'file:///LoanStats3bEDITED.csv' AS line 
//USING PERIODIC COMMIT 1000 makes sure we don't get a memory error
//creating the nodes with their properties
//member node
CREATE (member:Person{member_id:TOINT(line.member_id)})
//Personal information node
CREATE (personalInformation:PersonalInformation{addr_state:line.addr_state})
//recordHistory node
CREATE (recordHistory:RecordHistory{delinq_2yrs:TOFLOAT(line.delinq_2yrs),earliest_cr_line:line.earliest_cr_line,inq_last_6mths:TOFLOAT(line.inq_last_6mths),collections_12_mths_ex_med:TOFLOAT(line.collections_12_mths_ex_med),delinq_amnt:TOFLOAT(line.delinq_amnt),percent_bc_gt_75:TOFLOAT(line.percent_bc_gt_75), pub_rec_bankruptcies:TOFLOAT(line.pub_rec_bankruptcies), tax_liens:TOFLOAT(line.tax_liens)})
//Loan node
CREATE (loan:Loan{funded_amnt:TOFLOAT(line.funded_amnt),term:line.term, int_rate:line.int_rate, installment:TOFLOAT(line.installment),purpose:line.purpose})
//Customer Finances node
CREATE (customerFinances:CustomerFinances{emp_length:line.emp_length,verification_status_joint:line.verification_status_joint,home_ownership:line.home_ownership, annual_inc:TOFLOAT(line.annual_inc), verification_status:line.verification_status,dti:TOFLOAT(line.dti), annual_inc_joint:TOFLOAT(line.annual_inc_joint),dti_joint:TOFLOAT(line.dti_joint)})
//Accounts node
CREATE (accounts:Accounts{revol_util:line.revol_util,tot_cur_bal:TOFLOAT(line.tot_cur_bal)})

//creating the relationships
CREATE UNIQUE (member)-[:FINANCIAL{issue_d:line.issue_d,loan_status:line.loan_status, application_type:line.application_type}]->(loan)
CREATE UNIQUE (customerFinances)<-[:FINANCIAL]-(member)
CREATE UNIQUE (accounts)<-[:FINANCIAL{open_acc:TOINT(line.open_acc),total_acc:TOFLOAT(line.total_acc)}]-(member)
CREATE UNIQUE (personalInformation)<-[:PERSONAL]-(member)
CREATE UNIQUE (recordHistory)<-[:HISTORY]-(member)

但是，我不断收到以下错误：

Unable to rollback transaction

这是什么意思，我怎样才能修复我的查询，使其运行成功？

我现在收到以下错误：

GC overhead limit exceeded

Answer 1

我想你记性不好了。解决方案：

使用neo4j-import.batch

拆分您的查询。

进行约束以加快查询速度。

为什么需要创建唯一性？如果您的 csv 是干净的，您可以只使用创建，或者使用合并。

我认为如果您不在浏览器中而是在 shell 中执行查询，速度也会更快。

下载更多内存 :-)

Answer 2

如果您确实需要关系的唯一性，请将 create unique 替换为 merge。

此外，您在 FINANCIAL 上的重复 MERGE 操作会导致 Cypher 在 3 个操作中的每一个之前使用 Eager 运算符具体化整个结果，这样它就不会运行进入无限循环。

这就是为什么定期提交没有生效，导致整个中间结果占用太多内存。

您可以做的其他事情是使用 APOC 库和 apoc.periodic.iterate 而不是进行批处理。

call apoc.periodic.iterate("
LOAD CSV WITH HEADERS FROM 'file:///LoanStats3bEDITED.csv' AS line RETURN line
","
//member node
CREATE (member:Person{member_id:TOINT(line.member_id)})
//Personal information node
CREATE (personalInformation:PersonalInformation{addr_state:line.addr_state})
//recordHistory node
CREATE (recordHistory:RecordHistory{delinq_2yrs:TOFLOAT(line.delinq_2yrs),earliest_cr_line:line.earliest_cr_line,inq_last_6mths:TOFLOAT(line.inq_last_6mths),collections_12_mths_ex_med:TOFLOAT(line.collections_12_mths_ex_med),delinq_amnt:TOFLOAT(line.delinq_amnt),percent_bc_gt_75:TOFLOAT(line.percent_bc_gt_75), pub_rec_bankruptcies:TOFLOAT(line.pub_rec_bankruptcies), tax_liens:TOFLOAT(line.tax_liens)})
//Loan node
CREATE (loan:Loan{funded_amnt:TOFLOAT(line.funded_amnt),term:line.term, int_rate:line.int_rate, installment:TOFLOAT(line.installment),purpose:line.purpose})
//Customer Finances node
CREATE (customerFinances:CustomerFinances{emp_length:line.emp_length,verification_status_joint:line.verification_status_joint,home_ownership:line.home_ownership, annual_inc:TOFLOAT(line.annual_inc), verification_status:line.verification_status,dti:TOFLOAT(line.dti), annual_inc_joint:TOFLOAT(line.annual_inc_joint),dti_joint:TOFLOAT(line.dti_joint)})
//Accounts node
CREATE (accounts:Accounts{revol_util:line.revol_util,tot_cur_bal:TOFLOAT(line.tot_cur_bal)})

//creating the relationships
MERGE (member)-[:FINANCIAL{issue_d:line.issue_d,loan_status:line.loan_status, application_type:line.application_type}]->(loan)
MERGE (customerFinances)<-[:FINANCIAL]-(member)
MERGE (accounts)<-[:FINANCIAL{open_acc:TOINT(line.open_acc),total_acc:TOFLOAT(line.total_acc)}]-(member)
MERGE (personalInformation)<-[:PERSONAL]-(member)
MERGE (recordHistory)<-[:HISTORY]-(member)
", {batchSize:1000, iterateList:true})

"Unable to rollback transaction" Neo4j 中的错误

"Unable to rollback transaction" error in Neo4j

neo4j

graph-databases

cypher