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lib/logstorage: print column names to the error log message when the number of unique columns in a block exceeds the limit

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This should simplify debugging issues related to too big number of columns per block in the future.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/7568
This commit is contained in:
Aliaksandr Valialkin 2024-11-30 18:23:32 +01:00
parent 191180a1b5
commit 27a50b9551
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GPG key ID: 52C003EE2BCDB9EB
2 changed files with 39 additions and 6 deletions
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16
lib/logstorage/block.go
View file

@ -392,8 +392,9 @@ func (b *block) resizeColumns(columnsLen int) []column {
func (b *block) sortColumnsByName() {
if len(b.columns)+len(b.constColumns) > maxColumnsPerBlock {
logger.Panicf("BUG: too big number of columns detected in the block: %d; the number of columns mustn't exceed %d",
len(b.columns)+len(b.constColumns), maxColumnsPerBlock)
columnNames := b.getColumnNames()
logger.Panicf("BUG: too big number of columns detected in the block: %d; the number of columns mustn't exceed %d; columns: %s",
len(b.columns)+len(b.constColumns), maxColumnsPerBlock, columnNames)
}
cs := getColumnsSorter()
@ -407,6 +408,17 @@ func (b *block) sortColumnsByName() {
putConstColumnsSorter(ccs)
}
func (b *block) getColumnNames() []string {
a := make([]string, 0, len(b.columns)+len(b.constColumns))
for _, c := range b.columns {
a = append(a, c.name)
}
for _, c := range b.constColumns {
a = append(a, c.Name)
}
return a
}
// Len returns the number of log entries in b.
func (b *block) Len() int {
return len(b.timestamps)

29
lib/logstorage/block_header.go
View file

@ -492,8 +492,8 @@ func (csh *columnsHeader) unmarshalNoArena(src []byte, partFormatVersion uint) e
return fmt.Errorf("cannot unmarshal columnHeaders len")
}
src = src[nSize:]
if n > maxColumnsPerBlock {
return fmt.Errorf("too many column headers: %d; mustn't exceed %d", n, maxColumnsPerBlock)
if n > 1e6 {
return fmt.Errorf("too big number of columnHeaders: %d", n)
}
chs := csh.resizeColumnHeaders(int(n))
@ -506,14 +506,19 @@ func (csh *columnsHeader) unmarshalNoArena(src []byte, partFormatVersion uint) e
}
csh.columnHeaders = chs
if len(chs) > maxColumnsPerBlock {
columnNames := getNamesFromColumnHeaders(chs)
return fmt.Errorf("too many column headers: %d; it mustn't exceed %d; columns: %s", len(chs), maxColumnsPerBlock, columnNames)
}
// unmarshal constColumns
n, nSize = encoding.UnmarshalVarUint64(src)
if nSize <= 0 {
return fmt.Errorf("cannot unmarshal constColumns len")
}
src = src[nSize:]
if n+uint64(len(csh.columnHeaders)) > maxColumnsPerBlock {
return fmt.Errorf("too many columns: %d; mustn't exceed %d", n+uint64(len(csh.columnHeaders)), maxColumnsPerBlock)
if n > 1e6 {
return fmt.Errorf("too big number of constColumns: %d", n)
}
ccs := csh.resizeConstColumns(int(n))
@ -525,6 +530,14 @@ func (csh *columnsHeader) unmarshalNoArena(src []byte, partFormatVersion uint) e
src = tail
}
if len(ccs)+len(csh.columnHeaders) > maxColumnsPerBlock {
columnNames := getNamesFromColumnHeaders(csh.columnHeaders)
for _, cc := range ccs {
columnNames = append(columnNames, cc.Name)
}
return fmt.Errorf("too many columns: %d; mustn't exceed %d; columns: %s", len(ccs)+len(csh.columnHeaders), maxColumnsPerBlock, columnNames)
}
// Verify that the src is empty
if len(src) > 0 {
return fmt.Errorf("unexpected non-empty tail left after unmarshaling columnsHeader: len(tail)=%d", len(src))
@ -533,6 +546,14 @@ func (csh *columnsHeader) unmarshalNoArena(src []byte, partFormatVersion uint) e
return nil
}
func getNamesFromColumnHeaders(chs []columnHeader) []string {
a := make([]string, 0, len(chs))
for _, ch := range chs {
a = append(a, ch.name)
}
return a
}
// columnHeaders contains information for values, which belong to a single label in a single block.
//
// The main column with an empty name is stored in messageValuesFilename,