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Add contrib/pg_walinspect.
Provides similar functionality to pg_waldump, but from a SQL interface rather than a separate utility. Author: Bharath Rupireddy Reviewed-by: Greg Stark, Kyotaro Horiguchi, Andres Freund, Ashutosh Sharma, Nitin Jadhav, RKN Sai Krishna Discussion: https://postgr.es/m/CALj2ACUGUYXsEQdKhEdsBzhGEyF3xggvLdD8C0VT72TNEfOiog%40mail.gmail.com
This commit is contained in:
Jeff Davis
629
contrib/pg_walinspect/pg_walinspect.c
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629
contrib/pg_walinspect/pg_walinspect.c
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/*-------------------------------------------------------------------------
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*
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* pg_walinspect.c
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* Functions to inspect contents of PostgreSQL Write-Ahead Log
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*
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* Copyright (c) 2022, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/pg_walinspect/pg_walinspect.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/xlog.h"
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#include "access/xlog_internal.h"
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#include "access/xlogreader.h"
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#include "access/xlogrecovery.h"
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#include "access/xlogstats.h"
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#include "access/xlogutils.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "utils/pg_lsn.h"
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/*
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* NOTE: For any code change or issue fix here, it is highly recommended to
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* give a thought about doing the same in pg_waldump tool as well.
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*/
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(pg_get_wal_record_info);
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PG_FUNCTION_INFO_V1(pg_get_wal_records_info);
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PG_FUNCTION_INFO_V1(pg_get_wal_records_info_till_end_of_wal);
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PG_FUNCTION_INFO_V1(pg_get_wal_stats);
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PG_FUNCTION_INFO_V1(pg_get_wal_stats_till_end_of_wal);
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static bool IsFutureLSN(XLogRecPtr lsn, XLogRecPtr *curr_lsn);
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static XLogReaderState *InitXLogReaderState(XLogRecPtr lsn,
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XLogRecPtr *first_record);
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static XLogRecord *ReadNextXLogRecord(XLogReaderState *xlogreader,
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XLogRecPtr first_record);
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static void GetWALRecordInfo(XLogReaderState *record, XLogRecPtr lsn,
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Datum *values, bool *nulls, uint32 ncols);
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static XLogRecPtr ValidateInputLSNs(bool till_end_of_wal,
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XLogRecPtr start_lsn, XLogRecPtr end_lsn);
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static void GetWALRecordsInfo(FunctionCallInfo fcinfo, XLogRecPtr start_lsn,
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XLogRecPtr end_lsn);
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static void GetXLogSummaryStats(XLogStats * stats, ReturnSetInfo *rsinfo,
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Datum *values, bool *nulls, uint32 ncols,
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bool stats_per_record);
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static void FillXLogStatsRow(const char *name, uint64 n, uint64 total_count,
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uint64 rec_len, uint64 total_rec_len,
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uint64 fpi_len, uint64 total_fpi_len,
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uint64 tot_len, uint64 total_len,
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Datum *values, bool *nulls, uint32 ncols);
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static void GetWalStats(FunctionCallInfo fcinfo, XLogRecPtr start_lsn,
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XLogRecPtr end_lsn, bool stats_per_record);
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/*
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* Check if the given LSN is in future. Also, return the LSN up to which the
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* server has WAL.
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*/
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static bool
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IsFutureLSN(XLogRecPtr lsn, XLogRecPtr *curr_lsn)
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{
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/*
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* We determine the current LSN of the server similar to how page_read
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* callback read_local_xlog_page_no_wait does.
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*/
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if (!RecoveryInProgress())
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*curr_lsn = GetFlushRecPtr(NULL);
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else
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*curr_lsn = GetXLogReplayRecPtr(NULL);
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Assert(!XLogRecPtrIsInvalid(*curr_lsn));
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if (lsn >= *curr_lsn)
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return true;
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return false;
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}
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/*
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* Intialize WAL reader and identify first valid LSN.
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*/
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static XLogReaderState *
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InitXLogReaderState(XLogRecPtr lsn, XLogRecPtr *first_record)
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{
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XLogReaderState *xlogreader;
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/*
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* Reading WAL below the first page of the first sgements isn't allowed.
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* This is a bootstrap WAL page and the page_read callback fails to read
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* it.
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*/
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if (lsn < XLOG_BLCKSZ)
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ereport(ERROR,
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(errmsg("could not read WAL at LSN %X/%X",
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LSN_FORMAT_ARGS(lsn))));
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xlogreader = XLogReaderAllocate(wal_segment_size, NULL,
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XL_ROUTINE(.page_read = &read_local_xlog_page_no_wait,
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.segment_open = &wal_segment_open,
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.segment_close = &wal_segment_close),
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NULL);
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if (xlogreader == NULL)
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ereport(ERROR,
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(errcode(ERRCODE_OUT_OF_MEMORY),
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errmsg("out of memory"),
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errdetail("Failed while allocating a WAL reading processor.")));
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/* first find a valid recptr to start from */
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*first_record = XLogFindNextRecord(xlogreader, lsn);
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if (XLogRecPtrIsInvalid(*first_record))
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ereport(ERROR,
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(errmsg("could not find a valid record after %X/%X",
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LSN_FORMAT_ARGS(lsn))));
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return xlogreader;
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}
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/*
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* Read next WAL record.
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*
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* By design, to be less intrusive in a running system, no slot is allocated
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* to reserve the WAL we're about to read. Therefore this function can
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* encounter read errors for historical WAL.
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*
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* We guard against ordinary errors trying to read WAL that hasn't been
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* written yet by limiting end_lsn to the flushed WAL, but that can also
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* encounter errors if the flush pointer falls in the middle of a record.
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*/
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static XLogRecord *
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ReadNextXLogRecord(XLogReaderState *xlogreader, XLogRecPtr first_record)
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{
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XLogRecord *record;
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char *errormsg;
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record = XLogReadRecord(xlogreader, &errormsg);
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if (record == NULL)
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{
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if (errormsg)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not read WAL at %X/%X: %s",
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LSN_FORMAT_ARGS(first_record), errormsg)));
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else
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not read WAL at %X/%X",
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LSN_FORMAT_ARGS(first_record))));
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}
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return record;
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}
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/*
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* Get a single WAL record info.
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*/
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static void
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GetWALRecordInfo(XLogReaderState *record, XLogRecPtr lsn,
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Datum *values, bool *nulls, uint32 ncols)
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{
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const char *id;
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RmgrData desc;
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uint32 fpi_len = 0;
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StringInfoData rec_desc;
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StringInfoData rec_blk_ref;
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uint32 main_data_len;
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int i = 0;
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desc = GetRmgr(XLogRecGetRmid(record));
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id = desc.rm_identify(XLogRecGetInfo(record));
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if (id == NULL)
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id = psprintf("UNKNOWN (%x)", XLogRecGetInfo(record) & ~XLR_INFO_MASK);
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initStringInfo(&rec_desc);
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desc.rm_desc(&rec_desc, record);
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/* Block references. */
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initStringInfo(&rec_blk_ref);
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XLogRecGetBlockRefInfo(record, false, true, &rec_blk_ref, &fpi_len);
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main_data_len = XLogRecGetDataLen(record);
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values[i++] = LSNGetDatum(lsn);
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values[i++] = LSNGetDatum(record->EndRecPtr);
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values[i++] = LSNGetDatum(XLogRecGetPrev(record));
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values[i++] = TransactionIdGetDatum(XLogRecGetXid(record));
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values[i++] = CStringGetTextDatum(desc.rm_name);
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values[i++] = CStringGetTextDatum(id);
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values[i++] = UInt32GetDatum(XLogRecGetTotalLen(record));
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values[i++] = UInt32GetDatum(main_data_len);
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values[i++] = UInt32GetDatum(fpi_len);
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values[i++] = CStringGetTextDatum(rec_desc.data);
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values[i++] = CStringGetTextDatum(rec_blk_ref.data);
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Assert(i == ncols);
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}
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/*
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* Get WAL record info.
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*
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* This function emits an error if a future WAL LSN i.e. WAL LSN the database
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* system doesn't know about is specified.
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*/
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Datum
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pg_get_wal_record_info(PG_FUNCTION_ARGS)
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{
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#define PG_GET_WAL_RECORD_INFO_COLS 11
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Datum result;
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Datum values[PG_GET_WAL_RECORD_INFO_COLS];
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bool nulls[PG_GET_WAL_RECORD_INFO_COLS];
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XLogRecPtr lsn;
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XLogRecPtr curr_lsn;
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XLogRecPtr first_record;
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XLogReaderState *xlogreader;
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TupleDesc tupdesc;
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HeapTuple tuple;
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lsn = PG_GETARG_LSN(0);
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if (IsFutureLSN(lsn, &curr_lsn))
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{
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/*
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* GetFlushRecPtr or GetXLogReplayRecPtr gives "end+1" LSN of the last
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* record flushed or replayed respectively. But let's use the LSN up
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* to "end" in user facing message.
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*/
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("cannot accept future input LSN"),
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errdetail("Last known WAL LSN on the database system is at %X/%X.",
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LSN_FORMAT_ARGS(curr_lsn))));
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}
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/* Build a tuple descriptor for our result type. */
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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xlogreader = InitXLogReaderState(lsn, &first_record);
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(void) ReadNextXLogRecord(xlogreader, first_record);
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MemSet(values, 0, sizeof(values));
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MemSet(nulls, 0, sizeof(nulls));
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GetWALRecordInfo(xlogreader, first_record, values, nulls,
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PG_GET_WAL_RECORD_INFO_COLS);
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XLogReaderFree(xlogreader);
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tuple = heap_form_tuple(tupdesc, values, nulls);
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result = HeapTupleGetDatum(tuple);
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PG_RETURN_DATUM(result);
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#undef PG_GET_WAL_RECORD_INFO_COLS
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}
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/*
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* Validate the input LSNs and compute end LSN for till_end_of_wal versions.
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*/
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static XLogRecPtr
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ValidateInputLSNs(bool till_end_of_wal, XLogRecPtr start_lsn,
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XLogRecPtr end_lsn)
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{
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XLogRecPtr curr_lsn;
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if (IsFutureLSN(start_lsn, &curr_lsn))
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{
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/*
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* GetFlushRecPtr or GetXLogReplayRecPtr gives "end+1" LSN of the last
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* record flushed or replayed respectively. But let's use the LSN up
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* to "end" in user facing message.
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*/
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("cannot accept future start LSN"),
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errdetail("Last known WAL LSN on the database system is at %X/%X.",
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LSN_FORMAT_ARGS(curr_lsn))));
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}
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if (till_end_of_wal)
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end_lsn = curr_lsn;
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if (end_lsn > curr_lsn)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("cannot accept future end LSN"),
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errdetail("Last known WAL LSN on the database system is at %X/%X.",
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LSN_FORMAT_ARGS(curr_lsn))));
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if (start_lsn >= end_lsn)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("WAL start LSN must be less than end LSN")));
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return end_lsn;
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}
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/*
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* Get info and data of all WAL records between start LSN and end LSN.
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*/
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static void
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GetWALRecordsInfo(FunctionCallInfo fcinfo, XLogRecPtr start_lsn,
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XLogRecPtr end_lsn)
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{
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#define PG_GET_WAL_RECORDS_INFO_COLS 11
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XLogRecPtr first_record;
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XLogReaderState *xlogreader;
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ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
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Datum values[PG_GET_WAL_RECORDS_INFO_COLS];
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bool nulls[PG_GET_WAL_RECORDS_INFO_COLS];
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SetSingleFuncCall(fcinfo, 0);
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xlogreader = InitXLogReaderState(start_lsn, &first_record);
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Assert(xlogreader);
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MemSet(values, 0, sizeof(values));
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MemSet(nulls, 0, sizeof(nulls));
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for (;;)
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{
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(void) ReadNextXLogRecord(xlogreader, first_record);
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if (xlogreader->EndRecPtr <= end_lsn)
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{
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GetWALRecordInfo(xlogreader, xlogreader->currRecPtr, values, nulls,
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PG_GET_WAL_RECORDS_INFO_COLS);
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tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc,
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values, nulls);
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}
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/* if we read up to end_lsn, we're done */
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if (xlogreader->EndRecPtr >= end_lsn)
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break;
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CHECK_FOR_INTERRUPTS();
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}
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XLogReaderFree(xlogreader);
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#undef PG_GET_WAL_RECORDS_INFO_COLS
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}
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/*
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* Get info and data of all WAL records between start LSN and end LSN.
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*
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* This function emits an error if a future start or end WAL LSN i.e. WAL LSN
|
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* the database system doesn't know about is specified.
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*/
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Datum
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pg_get_wal_records_info(PG_FUNCTION_ARGS)
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{
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XLogRecPtr start_lsn;
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XLogRecPtr end_lsn;
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start_lsn = PG_GETARG_LSN(0);
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end_lsn = PG_GETARG_LSN(1);
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end_lsn = ValidateInputLSNs(false, start_lsn, end_lsn);
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GetWALRecordsInfo(fcinfo, start_lsn, end_lsn);
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PG_RETURN_VOID();
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}
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/*
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* Get info and data of all WAL records from start LSN till end of WAL.
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*
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* This function emits an error if a future start i.e. WAL LSN the database
|
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* system doesn't know about is specified.
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*/
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Datum
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pg_get_wal_records_info_till_end_of_wal(PG_FUNCTION_ARGS)
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{
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XLogRecPtr start_lsn;
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XLogRecPtr end_lsn = InvalidXLogRecPtr;
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start_lsn = PG_GETARG_LSN(0);
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end_lsn = ValidateInputLSNs(true, start_lsn, end_lsn);
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GetWALRecordsInfo(fcinfo, start_lsn, end_lsn);
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PG_RETURN_VOID();
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}
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/*
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* Fill single row of record counts and sizes for an rmgr or record.
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*/
|
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static void
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FillXLogStatsRow(const char *name,
|
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uint64 n, uint64 total_count,
|
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uint64 rec_len, uint64 total_rec_len,
|
||||
uint64 fpi_len, uint64 total_fpi_len,
|
||||
uint64 tot_len, uint64 total_len,
|
||||
Datum *values, bool *nulls, uint32 ncols)
|
||||
{
|
||||
double n_pct,
|
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rec_len_pct,
|
||||
fpi_len_pct,
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tot_len_pct;
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int i = 0;
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||||
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||||
n_pct = 0;
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||||
if (total_count != 0)
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n_pct = 100 * (double) n / total_count;
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||||
rec_len_pct = 0;
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if (total_rec_len != 0)
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rec_len_pct = 100 * (double) rec_len / total_rec_len;
|
||||
|
||||
fpi_len_pct = 0;
|
||||
if (total_fpi_len != 0)
|
||||
fpi_len_pct = 100 * (double) fpi_len / total_fpi_len;
|
||||
|
||||
tot_len_pct = 0;
|
||||
if (total_len != 0)
|
||||
tot_len_pct = 100 * (double) tot_len / total_len;
|
||||
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||||
values[i++] = CStringGetTextDatum(name);
|
||||
values[i++] = Int64GetDatum(n);
|
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values[i++] = Float4GetDatum(n_pct);
|
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values[i++] = Int64GetDatum(rec_len);
|
||||
values[i++] = Float4GetDatum(rec_len_pct);
|
||||
values[i++] = Int64GetDatum(fpi_len);
|
||||
values[i++] = Float4GetDatum(fpi_len_pct);
|
||||
values[i++] = Int64GetDatum(tot_len);
|
||||
values[i++] = Float4GetDatum(tot_len_pct);
|
||||
|
||||
Assert(i == ncols);
|
||||
}
|
||||
|
||||
/*
|
||||
* Get summary statistics about the records seen so far.
|
||||
*/
|
||||
static void
|
||||
GetXLogSummaryStats(XLogStats *stats, ReturnSetInfo *rsinfo,
|
||||
Datum *values, bool *nulls, uint32 ncols,
|
||||
bool stats_per_record)
|
||||
{
|
||||
uint64 total_count = 0;
|
||||
uint64 total_rec_len = 0;
|
||||
uint64 total_fpi_len = 0;
|
||||
uint64 total_len = 0;
|
||||
int ri;
|
||||
|
||||
/*
|
||||
* Each row shows its percentages of the total, so make a first pass to
|
||||
* calculate column totals.
|
||||
*/
|
||||
for (ri = 0; ri <= RM_MAX_ID; ri++)
|
||||
{
|
||||
if (!RmgrIdIsValid(ri))
|
||||
continue;
|
||||
|
||||
total_count += stats->rmgr_stats[ri].count;
|
||||
total_rec_len += stats->rmgr_stats[ri].rec_len;
|
||||
total_fpi_len += stats->rmgr_stats[ri].fpi_len;
|
||||
}
|
||||
total_len = total_rec_len + total_fpi_len;
|
||||
|
||||
for (ri = 0; ri <= RM_MAX_ID; ri++)
|
||||
{
|
||||
uint64 count;
|
||||
uint64 rec_len;
|
||||
uint64 fpi_len;
|
||||
uint64 tot_len;
|
||||
RmgrData desc;
|
||||
|
||||
if (!RmgrIdIsValid(ri))
|
||||
continue;
|
||||
|
||||
if (!RmgrIdExists(ri))
|
||||
continue;
|
||||
|
||||
desc = GetRmgr(ri);
|
||||
|
||||
if (stats_per_record)
|
||||
{
|
||||
int rj;
|
||||
|
||||
for (rj = 0; rj < MAX_XLINFO_TYPES; rj++)
|
||||
{
|
||||
const char *id;
|
||||
|
||||
count = stats->record_stats[ri][rj].count;
|
||||
rec_len = stats->record_stats[ri][rj].rec_len;
|
||||
fpi_len = stats->record_stats[ri][rj].fpi_len;
|
||||
tot_len = rec_len + fpi_len;
|
||||
|
||||
/* Skip undefined combinations and ones that didn't occur */
|
||||
if (count == 0)
|
||||
continue;
|
||||
|
||||
/* the upper four bits in xl_info are the rmgr's */
|
||||
id = desc.rm_identify(rj << 4);
|
||||
if (id == NULL)
|
||||
id = psprintf("UNKNOWN (%x)", rj << 4);
|
||||
|
||||
FillXLogStatsRow(psprintf("%s/%s", desc.rm_name, id), count,
|
||||
total_count, rec_len, total_rec_len, fpi_len,
|
||||
total_fpi_len, tot_len, total_len,
|
||||
values, nulls, ncols);
|
||||
|
||||
tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc,
|
||||
values, nulls);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
count = stats->rmgr_stats[ri].count;
|
||||
rec_len = stats->rmgr_stats[ri].rec_len;
|
||||
fpi_len = stats->rmgr_stats[ri].fpi_len;
|
||||
tot_len = rec_len + fpi_len;
|
||||
|
||||
FillXLogStatsRow(desc.rm_name, count, total_count, rec_len,
|
||||
total_rec_len, fpi_len, total_fpi_len, tot_len,
|
||||
total_len, values, nulls, ncols);
|
||||
|
||||
tuplestore_putvalues(rsinfo->setResult, rsinfo->setDesc,
|
||||
values, nulls);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Get WAL stats between start LSN and end LSN.
|
||||
*/
|
||||
static void
|
||||
GetWalStats(FunctionCallInfo fcinfo, XLogRecPtr start_lsn,
|
||||
XLogRecPtr end_lsn, bool stats_per_record)
|
||||
{
|
||||
#define PG_GET_WAL_STATS_COLS 9
|
||||
XLogRecPtr first_record;
|
||||
XLogReaderState *xlogreader;
|
||||
XLogStats stats;
|
||||
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
|
||||
Datum values[PG_GET_WAL_STATS_COLS];
|
||||
bool nulls[PG_GET_WAL_STATS_COLS];
|
||||
|
||||
SetSingleFuncCall(fcinfo, 0);
|
||||
|
||||
xlogreader = InitXLogReaderState(start_lsn, &first_record);
|
||||
|
||||
MemSet(&stats, 0, sizeof(stats));
|
||||
|
||||
for (;;)
|
||||
{
|
||||
(void) ReadNextXLogRecord(xlogreader, first_record);
|
||||
|
||||
if (xlogreader->EndRecPtr <= end_lsn)
|
||||
XLogRecStoreStats(&stats, xlogreader);
|
||||
|
||||
/* if we read up to end_lsn, we're done */
|
||||
if (xlogreader->EndRecPtr >= end_lsn)
|
||||
break;
|
||||
|
||||
CHECK_FOR_INTERRUPTS();
|
||||
}
|
||||
|
||||
XLogReaderFree(xlogreader);
|
||||
|
||||
MemSet(values, 0, sizeof(values));
|
||||
MemSet(nulls, 0, sizeof(nulls));
|
||||
|
||||
GetXLogSummaryStats(&stats, rsinfo, values, nulls,
|
||||
PG_GET_WAL_STATS_COLS,
|
||||
stats_per_record);
|
||||
|
||||
#undef PG_GET_WAL_STATS_COLS
|
||||
}
|
||||
|
||||
/*
|
||||
* Get stats of all WAL records between start LSN and end LSN.
|
||||
*
|
||||
* This function emits an error if a future start or end WAL LSN i.e. WAL LSN
|
||||
* the database system doesn't know about is specified.
|
||||
*/
|
||||
Datum
|
||||
pg_get_wal_stats(PG_FUNCTION_ARGS)
|
||||
{
|
||||
XLogRecPtr start_lsn;
|
||||
XLogRecPtr end_lsn;
|
||||
bool stats_per_record;
|
||||
|
||||
start_lsn = PG_GETARG_LSN(0);
|
||||
end_lsn = PG_GETARG_LSN(1);
|
||||
stats_per_record = PG_GETARG_BOOL(2);
|
||||
|
||||
end_lsn = ValidateInputLSNs(false, start_lsn, end_lsn);
|
||||
|
||||
GetWalStats(fcinfo, start_lsn, end_lsn, stats_per_record);
|
||||
|
||||
PG_RETURN_VOID();
|
||||
}
|
||||
|
||||
/*
|
||||
* Get stats of all WAL records from start LSN till end of WAL.
|
||||
*
|
||||
* This function emits an error if a future start i.e. WAL LSN the database
|
||||
* system doesn't know about is specified.
|
||||
*/
|
||||
Datum
|
||||
pg_get_wal_stats_till_end_of_wal(PG_FUNCTION_ARGS)
|
||||
{
|
||||
XLogRecPtr start_lsn;
|
||||
XLogRecPtr end_lsn = InvalidXLogRecPtr;
|
||||
bool stats_per_record;
|
||||
|
||||
start_lsn = PG_GETARG_LSN(0);
|
||||
stats_per_record = PG_GETARG_BOOL(1);
|
||||
|
||||
end_lsn = ValidateInputLSNs(true, start_lsn, end_lsn);
|
||||
|
||||
GetWalStats(fcinfo, start_lsn, end_lsn, stats_per_record);
|
||||
|
||||
PG_RETURN_VOID();
|
||||
}
|
||||
Reference in New Issue
Block a user