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Overview
| Comment: | In a checkpoint, figure out if it is possible to checkpoint any frames at all before creating the wal-iterator. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: | 044b0b65e716bffeddedbd1b0360c4c3 |
| User & Date: | dan 2018-03-02 16:52:47 |
References
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2018-03-05
| ||
| 23:23 | Fix walIteratorInit() so that it always leaves the iterator as a NULL pointer if an OOM occurs. This fixes an assertion fault introduced by check-in [044b0b65e716bff]. check-in: e5ce256a user: drh tags: trunk | |
Context
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2018-03-02
| ||
| 20:00 | In sqlite3_checker, wrap the call to "SELECT checkfreelist()" in a transaction. check-in: 02906e55 user: dan tags: trunk | |
| 17:59 | Update this branch with recent checkpoint related changes from trunk. check-in: fb6b7938 user: dan tags: begin-concurrent | |
| 16:52 | In a checkpoint, figure out if it is possible to checkpoint any frames at all before creating the wal-iterator. check-in: 044b0b65 user: dan tags: trunk | |
| 15:42 | Optimize the obscure case of running a checkpoint against a very large wal file for which a large percentage of the frames have already been checkpointed. check-in: 0f5057df user: dan tags: trunk | |
Changes
Changes to src/wal.c.
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szPage = walPagesize(pWal);
testcase( szPage<=32768 );
testcase( szPage>=65536 );
pInfo = walCkptInfo(pWal);
if( pInfo->nBackfill<pWal->hdr.mxFrame ){
/* Allocate the iterator */
rc = walIteratorInit(pWal, pInfo->nBackfill, &pIter);
if( rc!=SQLITE_OK ){
return rc;
}
assert( pIter );
/* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
** in the SQLITE_CHECKPOINT_PASSIVE mode. */
assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );
/* Compute in mxSafeFrame the index of the last frame of the WAL that is
** safe to write into the database. Frames beyond mxSafeFrame might
** overwrite database pages that are in use by active readers and thus
................................................................................
xBusy = 0;
}else{
goto walcheckpoint_out;
}
}
}
if( pInfo->nBackfill<mxSafeFrame
&& (rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(0),1))==SQLITE_OK
){
i64 nSize; /* Current size of database file */
u32 nBackfill = pInfo->nBackfill;
pInfo->nBackfillAttempted = mxSafeFrame;
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szPage = walPagesize(pWal);
testcase( szPage<=32768 );
testcase( szPage>=65536 );
pInfo = walCkptInfo(pWal);
if( pInfo->nBackfill<pWal->hdr.mxFrame ){
/* EVIDENCE-OF: R-62920-47450 The busy-handler callback is never invoked
** in the SQLITE_CHECKPOINT_PASSIVE mode. */
assert( eMode!=SQLITE_CHECKPOINT_PASSIVE || xBusy==0 );
/* Compute in mxSafeFrame the index of the last frame of the WAL that is
** safe to write into the database. Frames beyond mxSafeFrame might
** overwrite database pages that are in use by active readers and thus
................................................................................
xBusy = 0;
}else{
goto walcheckpoint_out;
}
}
}
/* Allocate the iterator */
if( pInfo->nBackfill<mxSafeFrame ){
rc = walIteratorInit(pWal, pInfo->nBackfill, &pIter);
assert( rc==SQLITE_OK || pIter==0 );
}
if( pIter
&& (rc = walBusyLock(pWal, xBusy, pBusyArg, WAL_READ_LOCK(0),1))==SQLITE_OK
){
i64 nSize; /* Current size of database file */
u32 nBackfill = pInfo->nBackfill;
pInfo->nBackfillAttempted = mxSafeFrame;
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