Yunkai Zhang created TS-2122:
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Summary: Enlarge the 64KB limitation of log buffer size
Key: TS-2122
URL: https://issues.apache.org/jira/browse/TS-2122
Project: Traffic Server
Issue Type: Improvement
Components: Logging
Reporter: Yunkai Zhang
The Logging module use uint16_t(LogBuffer->m_state.s.m_offset/byte_count) to
store log buffer size:
{code}
struct
{
uint16_t offset; // buffer should be <= 64KB
uint16_t num_entries; // number of entries in buffer
uint16_t byte_count; // bytes in buffer
uint16_t full:1; // not accepting more checkouts
uint16_t num_writers:15; // number of writers
} s;
{code}
It's very dangerous for user, as there are not any warning when user breaks the
limitation.
In our environment, we set the log_buffer_size to 512KB, it make ATS crashing.
I'll give a patch to enlarge this limitation from 64KB to 4GB by merging
*offset* and *byte_count* variables into one, so that we can use uint32_t to
store the buffer size.
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